- Glossary term
The V6 gasoline engine family Mitsubishi used across the second and third generations, in DOHC, SOHC and GDI direct-injection variants depending on… market and year — the SOHC is the engine in this site's own truck. The variant matters: they do not share fuel systems or all their parts, so the family code alone is not a fitment.
Engine
- Modification
A rear drawer turns a boot full of loose boxes into something you can find things in at night, and it is genuinely the modification people regret… least. It is also heavy before it holds anything: the unit cited below publishes its own weight, its external footprint, its usable internal space and its rated load, and the gap between the external and internal dimensions is the price of the slides and the frame. Set that unit weight against the difference between the curb weight and the gross weight in the second citation — that difference is the entire payload of the vehicle, and it is the same budget the passengers, the fuel, the roof load and the second battery are all drawing on.
Interior and trim
- Modification
A selectable rear locker is the single largest traction change available to this truck, and unlike a lift or a tire it does nothing at all until you… ask it to. The manufacturer cited below describes the mechanism precisely: activated, it stops the differential gears turning and therefore stops the two rear axle shafts turning independently of each other; unlocked, it behaves like an ordinary open differential. The rear application for this generation is listed for the whole 1999-2006 span across the common trims and is stated to suit all factory ratios, so a locker and a ratio change are independent decisions. The kit as sold is a differential and its switching hardware; the air to operate it is a separate purchase, which the manufacturer says in as many words.
Drivetrain
- Modification
Two separate limits apply to anything you put on the roof, and the smaller one wins. The first is the vehicle's own dynamic roof load — the weight… the roof may carry while the truck is moving, rack included — and the club article cited below gives that figure for this generation, alongside the much larger static figure that applies only when the vehicle is standing still and which the club is careful to attribute to a rack maker rather than to Mitsubishi. The second limit is whatever the rack you buy is rated for, which is a statement about the rack and never permission from the vehicle. Take the smaller number, subtract the rack's own weight from it, and what is left is the cargo you may actually carry up there.
Body
- Modification
The point of a second battery is that you can run a fridge, lights and a compressor overnight and still start the engine in the morning, because the… two jobs are kept on separate batteries. The part people get wrong is the charging. The manufacturer cited below states plainly that a smart isolator only tops the secondary battery up, because it is watching the state of charge of the primary one, while a DC-DC charger runs a multi-stage profile aimed at taking the auxiliary battery to full. That is the difference between a second battery that is genuinely available on the third evening and one that quietly never gets above most of the way.
Electrical system
- Modification
A Gen 3 has front airbags, and the airbag decides when to fire by reading how the front of the vehicle is crushing. A manufacturer of these bars… explains it plainly in the first citation: the triggering system is designed to work in harmony with the vehicle's frontal crush characteristics, and bolting on a rigid structure that does not behave the way the original front end behaved may change deployment timing — early or late, and it says both are dangerous. The same source describes what a compatible bar therefore has to do: measure the standard vehicle's crush behaviour and reproduce it in the bar and its mounting system, then say so on a sticker that names the standard it complies with. That is the difference between a bar engineered for this truck and a bar that merely bolts to it.
Body
- Glossary term
The anti-lock braking system, which releases and reapplies a wheel that is about to lock. A lit ABS light means the system has switched itself off… and the vehicle brakes as if it had none — it is not a light to keep driving on for months.
Brakes
- Problem
The second generation's multi-mode anti-lock braking is one of the things it was sold on, and it is also a system that goes quiet when it fails.… Owner reports filed with the United States road safety agency across several model years describe two things that belong together: the warning lamp staying on, and wheels locking so that the truck skids instead of stopping straight. When the control unit sees something it does not trust, it lights the lamp and hands the brakes back to you unassisted — the truck still stops, but it stops the way a truck without anti-lock brakes stops, which is not how this one is set up to behave on a loose or wet surface. The usual reason is one wheel-speed signal rather than the control unit: these sensors sit where road water, brake dust and gear oil reach them, and on a truck of this age the harness that carries the signal has been flexing for decades. Before any of that, settle which lamp you are actually looking at, because the truck has two and they mean different things — the anti-lock lamp is the one this entry is about, and the separate brake warning lamp is the one that comes on for a low fluid level or the parking brake. That distinction is free to make and it decides whether the rest of this page applies to you at all. This entry is written from owner reports in aggregate rather than from a factory bulletin, so treat the ranking of causes as a starting order, not a diagnosis. Anti-lock braking is work that is critical to safety: if the codes point past a sensor, take it to a qualified mechanic with the factory procedure.
BrakesSafety-critical
- Part
The single serpentine belt that drives everything on the front of the engine off the crankshaft — alternator, water-pump drive, power steering and… air conditioning. When it glazes, cracks or frays it announces itself with a squeal on a cold start or under load, and if it lets go you lose charging, power steering and cooling drive at once, so it is not a part to run to failure. It comes off with the timing cover during a belt service, so replace it then rather than paying for the access twice. The number on this page is the current Mitsubishi one; the catalogue also lists older numbers it replaces, and the parts counter can resolve any of them. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMN1835977PK2415
- Part
The grooved idler — the black one — which runs on the ribbed face of the accessory belt. It is the other of the two idlers on the front of this… engine, and it is not interchangeable with the smooth one however similar the bearing feels in your hand. Both idlers are cheap next to the belt and next to the labour of getting a belt back on, so when one is being changed the other is usually worth doing with it. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD368210PU157025BRR1XY
- Part
The smooth-faced idler the accessory belt runs over — the silver one. There are two idlers on the front of this engine and they are different parts:… this one runs on the flat back of the belt, the other is grooved and runs on the ribbed face. Order by face, not by "idler pulley", because both will come up under that phrase. A dry idler bearing announces itself as a rumble that changes with engine speed and not with road speed, and it is worth catching early: a seized idler shreds the belt, and the belt drives the alternator, the water pump drive and the power steering. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD368209PU159026RR1HY6
- Part
The automatic tensioner that keeps the accessory drive belt tight — the belt that runs the alternator, the water-pump drive, the power steering and… the air conditioning. It is a spring-loaded arm with a pulley, and when the spring tires or the pulley bearing dries out the belt starts to slip, squeal, or in the worst case get thrown off. Replace it with the belt, not after it: the access is the same and a new belt on a weak tensioner is a job half done. The specialist page states that Bando makes the original tensioner for these trucks and sells it under its own label, and the catalogue lists an alternate Mitsubishi number alongside this one, so let the parts counter cross-reference rather than insisting on a single number. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD367192
- Glossary term
A part made by someone other than the vehicle manufacturer. Costa Rican parts shops advertise these as repuestos no originales; quality ranges from… equal to the original down to unusable, so the brand matters more than the price.
General terms
- Glossary term
The cooling side of the climate system. Refrigerant type is not interchangeable between older and newer systems, and charging one is licensed work in… many jurisdictions.
Heating and air conditioning
- Glossary term
The gas that circulates in the air conditioning. In Spanish it is called gas refrigerante, which is not the engine coolant — that is refrigerante on… its own, and the two are never mixed up on this site.
Heating and air conditioning
- Glossary term
The filter in the intake. On dirt roads it fills far sooner than any schedule suggests, and a blocked one costs power and fuel.
Engine
- Glossary term
airbagbolsa de aire
The supplementary restraint that fires in a serious impact. It is a pyrotechnic device: never probe its circuits, never work near it with the battery… connected, and never treat a lit SRS light as cosmetic. This is qualified-mechanic work.
Interior and trim
- Glossary term
The generator that charges the battery and runs the vehicle once it is going. A charge light that comes on at idle and goes out with revs is usually… the belt or the brushes.
Electrical system
- Problem
Five switches sit on top of the transfer case and tell the truck which mode the selector is actually in. When one stops answering, the amber… centre-diff-lock symbol on the dash blinks, and depending on which switch it is the selector will refuse to leave the mode it is in. The pattern owners report most often is a light that starts blinking after a set distance of highway driving, goes out when the engine is restarted, and comes back after the same distance again. The specialist supplier's advice is to pull the transfer-case-specific trouble code first and confirm with a resistance measurement on each switch rather than replacing all five, and to clean the detent ball and its cavity and fit a new crush washer whenever a switch comes out. In the Spanish-language thread a third-generation owner's fault turned out to be a low transfer case oil level, while others in the same thread cleaned the switch connectors instead — which is exactly why the code comes before the parts.
Transfer caseWorks worse
- Problem
A buyer's guide for this generation puts the automatic's problem down to heat: towing, old fluid, a clogged cooler and high temperatures shorten its… life, and the guide tells a buyer to look for smooth shifts and clean fluid as the test. Owner reports filed with the United States road safety agency add the specific complaints that show up first — a transmission that will not shift properly when the truck is cold, and torque converters that failed. Heat is the whole story here and it explains why the symptoms arrive in the order they do. Transmission fluid does not wear out gradually and evenly; it survives until it has been cooked, and then it stops doing the two jobs it has, which are carrying pressure and holding friction. Once the fluid has gone, what it destroys is the clutch material inside, and that is the part that turns a fluid service into a rebuild. So the useful judgement is not about the transmission — it is about time. A truck that is slipping today can often be saved with a service; the same truck a thousand kilometres later usually cannot. Drive it gently, keep it off towing and long climbs, and get the fluid looked at this week rather than at the next service.
TransmissionDamages other parts
- Glossary term
The automatic transmission. Fluid condition is the single best clue to its health: dark fluid that smells burnt is a warning, not a maintenance note.
Transmission
- Glossary term
The fluid an automatic transmission uses as hydraulic medium, coolant and lubricant at once. The specification is not generic; the wrong fluid can… make a healthy transmission shift badly.
Fluids
- Glossary term
The shaft that carries drive from the differential out to the hub, with a joint at each end. Costa Rican counters usually quote it together with its… joints, as a punta de eje, and no Costa Rican catalog this site has opened names the bare shaft on its own — so the Spanish headword here is recorded at a low confidence tier rather than invented.
Drivetrain
- Problem
The 4D56 diesel runs two belts behind the same cover: the timing belt, and a smaller balance shaft belt sitting behind it. The inner belt drives… nothing the engine needs to run, which is exactly why it gets forgotten — a truck can have had its timing belt changed on schedule for decades while nobody touched the belt underneath it. A buyer's guide written for this generation and an owners' club thread agree on what happens next, from different directions. The club's members describe a snapped balance belt taking the cam belt with it and describe the worn, chewed sections of tooth that mark where the shafts stopped turning. The guide states the outcome for a belt-driven diesel of this design in one sentence: a thrown timing belt usually means a replacement engine. **The fitment above is narrower than the guide's own sentence, deliberately.** That guide groups this generation's diesels together; this entry is scoped to the one engine the club thread is actually about and the one the belt pair belongs to. If your truck has the other diesel, do not assume the entry applies or that it does not — find out what drives your camshaft and your balance shafts before you plan a service around either answer. There is no warning light for this and nothing to feel from the seat. What you have instead is paperwork: if nobody can tell you when the inner belt was last changed, treat it as never. The same thread records that the club's own experienced members often remove the balance belt rather than replace it, and reports the engine running smoothly without it — that is a real and widely used answer, and it is also a change to how the engine was built, so it is set out below as its own choice rather than buried in the recommendation.
EngineDamages other parts
- Glossary term
The ball-and-socket joint between the control arm and the steering knuckle. Play here is felt as a knock over bumps and as vague steering; a ball… joint that separates drops the corner of the vehicle, so it is inspection-and-replace, never wait-and-see.
Suspension
- Glossary term
The starter battery. It is also the first thing to disconnect before electrical work, and the last thing to blame before the grounds have been… checked.
Electrical system
- Glossary term
Any of the rolling bearings in hubs, transmission, transfer case and differentials. A wheel bearing that growls and changes tone as the vehicle is… steered is a safety item, not a noise to live with.
Drivetrain
- Problem
The third generation's brakes are assisted by a hydraulic booster with a gas-charged accumulator bolted to it, and that accumulator is the single… most reported fault on this truck. Mitsubishi recalled it for the first two model years this generation was sold in North America: the campaign says the accumulator may have been improperly manufactured, that it can leak its pressurised nitrogen over time, and that the result is an abnormal noise from the left of the dash panel plus a delayed first application of boost after the truck has been parked. Owners describe the noise the same way in every language — a chirp, a gobble, the honk of a goose — and the specialist supplier who sells the replacement names the same sound as the telltale. Two things this entry is careful about. The campaign covered vehicles built up to a cut-off date partway through its first year, and owner after owner reports the identical failure on a truck whose VIN is not on the list — including filings from later model years, each cited below and confirmed as a full-size Montero by its VIN. The entry therefore claims no factory authority outside the campaign's own years, and its tier reflects that. And the triage is not this site being cautious: one owner's mechanic told him not to drive it until it was repaired, another lost the brakes entirely at highway speed, and a third was told the truck could not be driven until the part was replaced.
BrakesSafety-critical
- Glossary term
Pushing fluid through each wheel in turn to get the air out. Air in the lines is what makes a pedal go soft or long, and a system that will not hold… a firm pedal after bleeding has another fault — take it to a qualified mechanic before driving.
Brakes
- Glossary term
The vacuum servo behind the master cylinder that multiplies pedal effort. Costa Rican parts lists call it the booster. A hard pedal with the engine… running, or a hiss from the firewall, points here or at its vacuum hose.
Brakes
- Part
The pressure vessel that stores hydraulic assist for the brake booster on the later Gen 3 trucks fitted with traction control. It is the big silver… cylinder; the trucks without traction control take a different, smaller, black and round part, which has its own page here — check which one your truck has before ordering, because they are not interchangeable and this is the brake system. The seller describes the failure the way owners describe it: a chirp or a turkey-gobble noise when you press the pedal. A brake part that has begun to announce itself is not a wait-and-see item. If the pedal has changed at all, stop driving it and have a qualified mechanic look at the whole booster circuit, not just this part. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Brakes4630A012
- Part
The smaller, black, round accumulator fitted to the later Gen 3 trucks that do not have traction control. It does the same job as the large silver… cylinder used on the traction-control trucks and it is not the same part. Read the confidence tier on this page carefully: unlike almost everything else in this wave, this number was not read off a catalogue listing for the part itself — it appears in a sentence on the page for the other accumulator, and no second source could be opened to confirm it. That is enough to write the number down and not enough to buy on. On a brake part, take this page to the counter as a starting point, have them look the number up against your chassis number, and have a qualified mechanic confirm which accumulator your truck actually carries before anything is ordered or fitted.
BrakesMR977223
- Glossary term
The hydraulic assembly that clamps the pads against the disc. A seized piston or a stuck slide pin drags one wheel, cooks that pad and pulls the… vehicle to one side under braking.
Brakes
- Glossary term
The disc the pads clamp. Warping, scoring or a thickness below the manufacturer's limit means machining or replacement; a shudder felt through the… pedal usually starts here.
Brakes
- Glossary term
The drum the shoes press against. Like a disc it has a maximum diameter stamped on it; past that it goes in the scrap pile, not back on the vehicle.
Brakes
- Glossary term
The hydraulic fluid in the brake system. It absorbs water over time, which lowers its boiling point and can put air in the pedal on a long descent —… a real risk on Costa Rican mountain roads. Use the grade the vehicle calls for and change it on schedule.
Brakes
- Glossary term
The flexible line between the hard line and the caliper. It ages from the inside: a hose that has swollen shut acts like a stuck caliper and can hold… a brake on after the pedal is released.
Brakes
- Problem
Owner reports filed with the United States road safety agency return to this one across the later model years of the generation — the fitment above… is set to the years those reports actually cover, not to the whole run: the pedal pulses, the steering wheel shakes when the brakes come on, the front discs get machined, and the judder is back well before the next set of pads is due. The repeat is the useful part of the story. A disc that is machined and then judders again was rarely the whole fault — something is still making one part of the disc face run hotter, or thicker, than the rest. This is a heavy truck on a front disc that was sized for a heavy truck, and the two usual culprits are a caliper that no longer slides freely and a wheel that was hammered on with an impact gun instead of torqued in sequence. It is uncomfortable rather than dangerous on its own: the brakes still work, and they still work well enough to stop the truck. What earns the caution is what tends to be underneath it — a caliper that drags is also cooking the fluid and the pads on that corner, and a bearing loose enough to show as judder is a different problem wearing a brake costume. Drive it gently, avoid long descents on the brakes, and get it looked at.
BrakesWorks worse
- Glossary term
The rear lamp that comes on with the pedal. In Costa Rican speech both the lamp and its switch are simply the stop, and a failed switch can also… upset cruise control and gear selection on some vehicles.
Electrical system
- Glossary term
The cylinder the pedal acts on, which sends pressure to all four wheels. Costa Rican catalogs list it as the bomba principal de freno and the wheel… cylinders as bombas auxiliares.
Brakes
- Glossary term
The friction pads a caliper squeezes against the disc. In Costa Rica they are pastillas de freno on every parts counter; balatas is the Mexican word,… and in Mexico it covers drum linings too. Pads are a safety item: replace them in axle sets, never one wheel alone.
Brakes
- Glossary term
The curved friction shoes that press outward inside a drum. On a Montero this is the rear brake on many versions, and the parking brake on others.
Brakes
- Glossary term
buildpreparación
A vehicle worked over as a project — suspension, tires, protection, load carrying — rather than a single repair. Spanish says preparación, and a shop… that does this work advertises preparación de vehículos 4x4.
General terms
- Glossary term
The lamp itself, as opposed to the housing it sits in. Costa Rican catalogs list them as bombillos.
Electrical system
- Glossary term
The front or rear impact structure and its cover. Costa Rican parts shops sell it in English as the bumper — bumper delantero, bumper trasero — and a… steel replacement fitted for off-road work changes weight, airbag behavior and approach angle all at once.
Body
- Problem
A motoring publication answering owner questions about the late trucks of this generation puts it plainly: these engines tend to burn oil as the… distance climbs, and the usual reason is the valve stem seals rather than anything structural — the same answer says it is not regarded as a serious fault. An owners' club thread about a mid-1990s truck losing oil with no visible leak reaches the same list from the other end, with the club's members naming valve stem seals first and then the breather system and turbo shaft wear as the alternatives worth eliminating. The two together are the shape of this problem: it is an ageing-engine trait, not a defect, and its main cost is that it is easy to ignore until the level is low enough to matter. **On the petrol engines the tell that points at the seals is timing.** Oil that seeps past a stem seal collects while the engine sits, so the smoke comes on the first start of the day or after a long wait at lights, and then clears; oil getting past the rings burns all the time, so the smoke stays. **On the diesels that reading does not carry over**, and the club thread cited here is the reason it is spelled out: it is a diesel truck, and the members answering it reach for the crankcase breather and a worn turbo before they reach for the valve stem seals, because a cold diesel smokes for reasons a cold petrol engine does not. If your truck is a diesel, work the breather and the turbo first and treat the seals as the answer that survives eliminating them. Whichever engine you have: check the level often, decide what you are willing to spend, and remember that an engine that uses oil and is never topped up is an engine that stops being fixable.
EngineWorks worse
- Glossary term
The rubber or polyurethane sleeve that lets a suspension joint move without metal touching metal. Costa Rican catalogs write it as bushing — bushing… de tijereta — and perished bushings are behind most clunks and most of the vagueness in an old truck.
Suspension
- Glossary term
The filter for the air that reaches the cabin. Costa Rican shops list it as the filtro de aire acondicionado; a blocked one is the usual reason the… fan blows hard and moves nothing.
Heating and air conditioning
- Glossary term
The shaft whose lobes open the valves. Whether it sits in the head or in the block is what SOHC and OHV mean, and the Montero range has both layouts.
Engine
- Glossary term
The everyday word for a passenger vehicle in Costa Rica, used for anything from a sedan to a Montero. Spanish prose on this site says carro; vehículo… is the neutral form when the sentence needs one.
General terms
- Problem
Exhaust gas recirculation sends a measured amount of exhaust back into the inlet to lower combustion temperature. Soot in that exhaust meets oil mist… in the inlet, and over enough short cold journeys the two build a hard deposit that narrows the manifold and can hold the valve off its seat. The result is a truck that hesitates, idles roughly and no longer answers the throttle the way it used to. The cited source names this on both the third and fourth generations; it is one source and the entry is tiered accordingly. The honest framing is that this is a wear-and-use problem rather than a defect: a truck that does long runs at load rarely gets there, and a truck used for short urban trips gets there sooner. Nothing about it makes the truck unsafe, which is why the triage says drive normally — but it will cost you fuel and throttle response until it is cleaned, and a valve stuck open will keep dumping soot into the inlet you just paid to clean.
ExhaustWorks worse
- Glossary term
The mechanical mixer used on the earliest gasoline versions, before fuel injection — carburettor in British and Australian usage. A carbureted engine… and an injected one share almost nothing in the fuel system, so fitment matters more than usual here.
Fuel system
- Glossary term
The emissions device in the exhaust. Whether one is required, and what happens if it is missing, depends entirely on the jurisdiction — Costa Rica's… RTV, a British MOT and a US state test are three different rulebooks.
Exhaust
- Glossary term
The differential inside a Super Select transfer case that lets front and rear axles turn at different speeds. Open, the vehicle can use four-wheel… drive on pavement; locked, front and rear are tied together for grip.
Transfer case
- Glossary term
The structure the running gear bolts to. Rust in the rails, the crossmembers and the suspension mounting points is a structural and safety question,… not a cosmetic one — have it assessed properly before spending money on anything else.
Body
- Glossary term
The friction coupling between engine and transmission. Costa Rican parts counters sell it as the clutch — kit de clutch, bomba de clutch — while… embrague also appears in catalogs; both are understood locally.
Transmission
- Glossary term
The hydraulic cylinder the clutch pedal acts on; the one at the transmission end is the slave. Costa Rican catalogs list them as bomba principal and… bomba auxiliar de clutch.
Transmission
- Glossary term
The coil that carries the weight at a corner of the vehicle. A sagging spring changes ride height, alignment and headlamp aim; springs are also what… makes suspension work dangerous without the right compressor.
Suspension
- Glossary term
The arm that locates a wheel against the body. Costa Rican parts shops sell it as the tijereta, with its bushings and ball joint listed separately.
Suspension
- Glossary term
The water-and-additive mix that carries heat out of the engine. Costa Rican counters sell it as refrigerante and also as líquido para radiador. Type… matters — mixing incompatible coolants turns them to jelly — and it is never opened hot.
Cooling
- Glossary term
Radiator, pump, thermostat, hoses and coolant. This site's Spanish chrome files these entries under Refrigeración.
Cooling
- Problem
The specialist supplier who imports replacements for the 3.5-litre V6 describes cracked original manifolds as very common, and the shape of their… catalogue tells the same story: they stock left and right castings, they warn that a junkyard unit has a high probability of being cracked too, and they list all three gaskets the job consumes. The symptom this entry leads with — a tick from the engine bay on a cold start that fades as the metal expands and the crack closes up — is not in that source; it is the ordinary mechanical reading of a cracked casting, and it is set down here as inference so a reader can weigh it as such. It is worth knowing because it is exactly why the noise is so often mistaken for a valvetrain problem and chased in the wrong place. This entry is scoped to the years the cited source covers; the later 3.8-litre trucks take different castings and are not claimed here. Two things to be careful about. An exhaust leak upstream of the oxygen sensor changes what the engine management sees, so a fuel-trim or sensor code here may be a symptom rather than a fault of its own. And any exhaust leak is a reason to keep the cabin ventilated until it is fixed; if you smell exhaust inside the vehicle, that is a different and more urgent problem than this one. Everything here comes from one specialist supplier's product documentation, which is why the entry is filed at the weakest tier: it is a trade opinion, not an aggregate of owners agreeing.
ExhaustWorks worse
- Problem
A small group of owner reports filed with the United States road safety agency describes something that does not appear on most fault lists for this… truck: welds on the rear axle housing cracking and separating, with gear oil escaping along the seam, the wheel on that side no longer standing square, and owners describing the wheel as heading for separation. One of them describes the housing as having separated at the weld three quarters of the way around. There is no recall behind this and no factory bulletin cited here — it is a pattern in owner reports, several of them, describing the same failure in the same place. **Every one of those reports is from a single model year**, and the fitment above is deliberately narrowed to it rather than spread across the generation: the evidence says what it says, and no more. If your truck is an adjacent year, the inspection below is still worth ten minutes, but nothing here claims your year is affected. That scoping, and the absence of any bulletin, is why the entry sits at community-consensus rather than carrying documentary authority. The reason it says tow rather than drive carefully is that the failure has no useful middle. An axle housing is what holds the wheel at the right angle to the road and keeps the differential's gears in mesh; when it is cracked, load is being carried by less metal every kilometre, and the failure that ends it is a wheel going somewhere the truck is not. If you find a wet seam along a weld on the axle, or a rear wheel that has started leaning, the sensible next move is a flatbed and a qualified mechanic looking at it on a hoist, not a careful drive to the workshop.
DrivetrainSafety-critical
- Glossary term
The shaft that turns the pistons' up-and-down into rotation. Its pulley, its seals and its bearings are all common sources of leaks and noises on… high-mileage engines.
Engine
- Glossary term
The pulley bolted to the nose of the crankshaft that drives the accessory belts. On most of these engines it is not a plain pulley but a damper: two… metal rings bonded through a rubber layer that soaks up the crankshaft's torsional vibration. Costa Rican counters list it as the polea principal del motor and will also answer to damper. Two things go wrong with it, and this site documents both — the rubber perishes and lets the outer ring walk, or the single bolt through its centre works loose.
Engine
- Problem
The Montero specialist who supplies the updated fastener describes the original crankshaft centre bolt as a defective design that would often back… out and break, ruining the crankshaft and sometimes other engine components with it, and sells the replacement with thread locker already applied. Mitsubishi ran a factory campaign for the same fastener on the previous generation's smaller V6 and on another model. That campaign is not this engine and this entry does not claim it is — but it is worth reading, because the manufacturer's own stated consequence is a loss of power steering assist and an increased risk of a crash, and the manufacturer's own remedy was to tighten the bolt to the correct torque specification, replacing it only where it was damaged. This entry is scoped to the bolt already going: every symptom below — a pulley you can see wobbling, a knock from the nose of the crankshaft, a thrown accessory belt — is the failure in progress, which is why the triage is do not drive. A truck that simply still has the original bolt in it, with none of those signs, is a different situation: that is the factory campaign's own remedy, a torque check at the next service, not a reason to park it. **A warning about the popular shortcut.** Enthusiasts pass around a way to tell the two bolts apart by eye, from how far the head stands out of the pulley. The suppliers who sell the part do not describe it the same way round as each other, and this site could not reach a source good enough to settle which direction is correct — so it is not printed here. Identify the bolt by its part number instead. Getting that test backwards would tell an owner the defective bolt is the good one.
EngineDamages other parts
- Problem
This is the defining mechanical failure of the second-generation Montero and the one worth knowing before anything else on the engine. Mitsubishi's… United States recall states that the bolt securing the crankshaft pulley can work loose and that the pulley can then fall off the vehicle, and it names the consequence in plain terms: loss of power steering assist, with an increased risk of a crash. The pulley is what drives every belt on the front of the engine, so when it leaves, the steering pump, the alternator and the water pump all stop at once — heavy steering, no charging and a rising temperature gauge, arriving together and without warning. Owner reports filed with the same agency are unusually numerous for this component and they add two things the campaign does not: some describe the bolt loosening again after it was tightened, and several describe the crankshaft nose itself being chewed out, which turns a fastener job into an engine. **Read the campaign's scope carefully, because it is narrower than the truck.** It names Monteros fitted with the smaller of the two petrol V6s, and the fitment above is set to that engine for exactly that reason — a truck with the larger V6 was never part of it. That boundary is not a statement that the larger engine is immune, and the cited owner reports are blunt about how it felt from outside: one asks why there is no recall for the bigger engine, another records being told their truck was excluded by its identification number. Owners of an excluded truck get the same inspection and none of the free repair. Treat a knock or a visible wobble at the front of the engine as this fault until it is proven otherwise, whichever engine you have, and do not drive the truck to find out.
EngineSafety-critical
- Problem
The single bolt through the middle of the crankshaft pulley backs out, then snaps. It is among the most-repeated complaints owners of the V6… first-generation Montero filed with the US federal safety regulator, and a repair database that names the engines affected puts the 3.0 V6 at the head of the list, and the reason it is filed here as a safety problem rather than an engine problem is what happens next: the pulley and every belt it drives leave the engine at once, so the power steering pump, the alternator and the water pump all stop together, without warning, at whatever speed the truck happens to be doing. Owners in the complaint records describe exactly that sequence, one of them ending in a loss of control. The repair is cheap while it is only a loose bolt and expensive once the crankshaft nose is chewed. Treat a knock from the front of the engine on this truck as this problem until you have proved it is not. This is safety-critical work: have it done by a qualified mechanic.
EngineSafety-critical
- Problem
The crankshaft pulley on this engine is two metal rings bonded together through a rubber layer that damps torsional vibration. That rubber perishes… with age rather than with distance, which is why the one source that documents this for the fourth generation says the failures turn up on trucks of a certain age regardless of how far they have gone. One source is why this entry carries the site's weakest confidence tier: the Spanish-language owner record beside it covers earlier trucks, and its single fourth-generation entry is somebody asking for a torque figure rather than reporting a failure — and every fourth-generation truck is now that age. When the bond lets go, the outer ring walks relative to the hub: the belt runs off line and squeals, then throws, and everything the belt drives stops. Spanish-language owner reports on the same family of trucks describe the related failure of the centre bolt working loose or breaking, which the first-generation entry on this site documents in detail from federal complaint records. Treat a wobbling pulley the same way in both cases: stop. Losing the belt takes the water pump and the steering assist with it, which is why this is filed as safety-critical work for a qualified mechanic rather than a noise to monitor.
EngineDamages other parts
- Glossary term
The constant-velocity joint at the end of an axle shaft — the joint that keeps transmitting drive while the wheel is steered. It is not the shaft… itself. Costa Rican counters sell the assembled unit as the punta de eje, inner and outer, so a shaft and its joints are often quoted as one part; ask which you are getting. A clicking noise on full lock is the outer joint, and a torn boot is what kills them.
Drivetrain
- Glossary term
The casting on top of the block that carries the valves and the combustion chambers. Costa Rican shops call it the cabezote; Spain says culata.
Engine
- Glossary term
The panel with the instruments and the vents. On this range the top cracks in tropical sun, and the wiring behind it is where a lot of intermittent… faults hide.
Interior and trim
- Glossary term
Compression-ignition fuel, and by extension the engines that run on it — the 4D56, 4M40 and 4M41 families in this range.
Fuel system
- Glossary term
A porous ceramic honeycomb in the exhaust that traps soot instead of letting it out of the tailpipe. It has to be emptied by burning the trapped soot… off — regeneration — which happens on its own when the exhaust runs hot enough on a long run, or is forced by the engine injecting extra fuel to raise the temperature, or by a workshop with diagnostic equipment. Soot burns; ash does not, and an ash-loaded filter needs cleaning or replacing. Only the fourth generation carries one, and not every version of it.
Exhaust
- Problem
The filter fills with soot, the warning lamp comes on, the engine tries to burn the soot off and cannot, and eventually the engine management lamp… joins in and the power goes. Owners in the cited club threads single out the earliest automatic fourth-generation diesels as the ones that give the most trouble, and report that dealer forced regenerations on those trucks can fail repeatedly. Two of their findings are worth carrying into any diagnosis. First, a blocked filter is detected by a pressure difference across it, so a fault in that sensing circuit produces the same warning as a genuinely blocked filter — one member found the filter almost clean after all the warnings said otherwise. Second, soot burns and ash does not: a filter full of ash will not respond to any amount of regeneration, forced or otherwise, and needs cleaning or replacing. The reason the triage is not simply drive-normally is what happens next when regeneration keeps failing — see the engine-oil level entry for this generation.
ExhaustDamages other parts
- Glossary term
The gearset in each axle that lets the two wheels turn at different speeds. Front and rear ratios must match on a four-wheel-drive vehicle —… mismatched ratios destroy the drivetrain.
Drivetrain
- Glossary term
A mechanism that ties the two output shafts of a differential together so a wheel with no grip cannot take all the drive. It is for slow, low-grip… work and is disengaged before returning to a hard surface.
Transfer case
- Glossary term
The external belt that drives alternator, water pump, power steering and air conditioning. Costa Rican usage is faja — a CR truck-parts catalog files… them as Fajas / Bandas / Correa De Distribución. A glazed or cracked belt squeals cold and can leave you without charging or steering assistance.
Engine
- Problem
Mitsubishi Motors North America recalled the driver airbag inflators fitted to the last United States trucks of this generation. The campaign says… the inflators can absorb moisture over time and then either rupture when the airbag fires, sending metal fragments at whoever is behind the wheel, or underinflate so that the airbag does not do its job at all. Both outcomes only appear in a crash, which is what makes this different from every other fault on this site: nothing about how you drive changes the risk on any single trip, and there is no test you can run in the driveway. What does change is exposure — the defect is a moisture problem that accumulates, and every additional month of humidity and heat is on the wrong side of it. That is the honest reason the triage here is not simply 'drive normally': keep using the truck if you must, but get the remedy booked rather than filed away. The remedy is a free inflator replacement at a dealer, and this generation is old enough that a truck may have changed hands several times without the notice ever reaching the current owner. Never open, probe or attempt to replace an airbag module yourself. The campaign is a United States one; a truck sold or imported elsewhere was not part of it, and what any other market required is not stated here.
Interior and trimSafety-critical
- Glossary term
The shaft between transfer case and differential. Vibration that comes in at a particular road speed and worsens with load often starts at its joints… or its balance. British usage calls this the propshaft and reserves driveshaft for the axle shaft, so a parts list written in one dialect and read in the other is a real source of wrong orders.
Drivetrain
- Glossary term
Everything that carries power from the transmission to the wheels: transfer case, driveshafts, differentials and axle shafts. This site's Spanish… chrome files it as Tren motriz.
Drivetrain
- Glossary term
The simpler part-time system: rear-wheel drive, four-wheel drive high and four-wheel drive low, with no center differential. Four-wheel drive on it… is for loose surfaces only — using it on dry pavement winds up the drivetrain and breaks things.
Transfer case
- Glossary term
The valve that lets a measured amount of exhaust gas back into the inlet, lowering peak combustion temperature and with it the oxides of nitrogen the… engine makes. Costa Rican counters sell it under the English initials. Because what it admits is sooty and what it meets in the inlet is oily, it is also the part that carbons up: a valve held off its seat by deposits feeds exhaust in continuously, and the truck runs rough and flat.
Exhaust
- Glossary term
The unit that makes the power. Montero engines are identified by family code — 6G74, 4M40 and the rest — and the code, not the model year, is what… parts are ordered against.
Engine
- Glossary term
The control unit that runs fuelling and ignition, and stores fault codes. A stored code names a circuit, not a part to buy.
Electrical system
- Glossary term
The rubber mount that holds the engine to the frame. Collapsed mounts let the engine move, which shows up as a clunk on take-up and vibration at idle.
Engine
- Glossary term
The oil in the sump. Grade and change interval come from the vehicle's own documentation, and on this site no interval is published without a source.
Engine
- Problem
An owner of an early fourth-generation diesel reported, after a long fight with particulate filter regeneration, that the sump had filled with a… large quantity of diesel. That is one account, so this entry sits at the site's lowest confidence tier — but the mechanism behind it is not in dispute and is worth knowing before it happens to you. To burn the filter clean, the engine injects extra fuel late in the cycle; if the regeneration never completes, some of that fuel runs down the bores into the oil instead of burning. Diluted oil is thinner oil, and thinner oil does not protect bearings, so a filter problem quietly becomes an engine problem. This is why the triage here is stricter than the filter entry it follows from: an oil level that is rising on its own means the oil is no longer oil. Stop driving, check it cold, and get the cause found. Have this diagnosed by a qualified mechanic — and never keep driving a diesel whose oil level is climbing.
EngineDamages other parts
- Problem
A handful of owners have reported engine-bay fires on these trucks to the US federal regulator — one while driving, two while parked. That is a small… number, and it is why this entry is tiered as weakly as it is: nothing here establishes a design defect, and it should not be read as one. What it does establish is the failure mode worth taking seriously on any truck this old, where insulation has had decades to go hard, high-current connections have had decades to corrode, and something has almost certainly nested in the engine bay at least once. Several of the other problems documented for this generation end in leaked oil or fuel on hot metal. The right response to smoke or a burning smell is to stop, switch off, and disconnect the battery — not to drive on and see. Have a qualified mechanic go through the harness before you put it back on the road.
Electrical systemSafety-critical
- Glossary term
The cast iron part bolted to the cylinder head that gathers the exhaust from each cylinder into one pipe. A V6 has one per bank. They crack with age… and heat cycling, and the crack usually announces itself as a tick that fades as the engine warms. Costa Rican parts catalogues list it as múltiple de escape, and also under the English word manifold.
Exhaust
- Part
The gasket between each exhaust manifold and its cylinder head. The truck takes one per bank, so the quantity above is the pair, and there is no… sensible way to do one side only once the studs are out — they are the cheapest thing in the job and the only thing standing between you and doing it again. Cracked manifolds are a known Gen 3 problem, which means most people meeting this gasket are meeting it during a manifold replacement rather than because the gasket itself failed. The catalogue lists further OEM interchange numbers alongside this one; none of them has a page here yet, so let the parts counter cross-reference rather than insisting on a single number. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
ExhaustMR281721
- Glossary term
Something that has failed or is failing on the vehicle. The Costa Rican word is falla, in the shop and on the invoice alike; avería is understood but… reads formal, and a vehicle stopped by one se varó.
General terms
- Glossary term
The panel over each wheel. In Costa Rica it is also heard as guardafango, and the liner behind it is what keeps mud out of the wiring.
Body
- Glossary term
Which vehicles a part, a fault or a procedure actually applies to — generation, market, year range, engine, transmission, transfer case. Every entry… on this site carries one.
General terms
- Glossary term
The oils and hydraulic fluids a vehicle runs on. Costa Rican shops group them as aceites y líquidos, and this site's Spanish chrome uses Líquidos for… the category. Grade and specification always come from a cited source, never from what looks similar on the shelf.
Fluids
- Glossary term
flywheelvolante del motor
The mass bolted to the back of the crankshaft that smooths the firing pulses and carries the clutch friction surface and the starter ring gear.
Engine
- Glossary term
Drive delivered to both axles instead of one. The manufacturer's own specification sheet for this truck describes it as 4WD with a two-speed transfer… case; the Spanish headword here, doble tracción, is this site's designation rather than a term any cited catalog prints — tracción en las cuatro ruedas is the long form and 4x4 the short one, and both are fine in prose. A part-time system — tracción conectable, engaged by hand — must not be used in four-wheel drive on dry pavement; a system with a center differential may be. It is not all-wheel drive, which stays engaged and has no low range.
Transfer case
- Problem
You select four-wheel drive, the transfer case goes in, and one front wheel still does nothing. This rests on a single club thread rather than the… several independent ones a stronger tier would need, so treat it as a well-argued starting point. On the automatic hubs, the answer in that thread is a small driving dog inside the hub that has snapped off — and the loading that snaps it is exactly the loading you apply when you are already stuck and rocking the truck forward and back. Members describe a ratcheting sound from the hub as the warning that comes first, which makes it worth acting on rather than driving through. The same thread is unanimous that the factory manual hubs are the stronger part and bolt straight up in place of the automatics, which is why that is listed here as a fix and not as a modification. The truck drives perfectly well in two-wheel drive with a dead hub, so this is not an emergency on tarmac — it is an emergency the first time you need the front axle and do not have it.
Transfer caseCan strand you
- Glossary term
The lockable front hubs on earlier part-time versions, which disconnect the front axle shafts when four-wheel drive is not in use. Manual ones are… turned by hand at the wheel; leaving them locked wears the front drivetrain for nothing.
Transfer case
- Part
The solenoid valve that routes engine vacuum to engage and disengage the front freewheel clutch when you shift the transfer case in and out of… four-wheel drive. When it fails the front axle cannot make up its mind: the specialist describes the classic sign as the green front-axle lights on the dash blinking instead of settling, and the truck refusing to lock into or drop out of 4x4 cleanly. It is one of the first parts to suspect for that fault and it is far cheaper than the actuator or the transfer case itself — but a blinking 4x4 light has more than one cause, so confirm the vacuum supply and the actuator before spending on this. The catalogue lists interchange numbers alongside this one; let the parts counter cross-reference. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR430381
- Problem
On Super Select trucks the front axle is locked and unlocked by a vacuum-operated clutch, and the dash indicator only settles when the transfer lever… and the front axle agree about which mode the truck is in. When they disagree, the indicator blinks — which is why a blinking front-wheel display is not a fault in the display. A specialist supplier of parts for these trucks states the same thing on its own product page for the control solenoid: blinking front-wheel lights mean the front axle is having trouble engaging or disengaging. A buyer's guide for this generation tells buyers to try every mode and treats flashing lights as an actuator or position-switch fault. Spanish-language owner reports show the same two complaints reaching drivers in the same words — the front-wheel lights flashing and the lever refusing to go where it is asked — and they are cited here for that and for nothing else: the reports on that page span several generations of this truck, and the causes individual posters propose for their own vehicles are not carried over to this one. This entry is the half where the front axle never comes in. It is a lost capability rather than a hazard: the truck drives and stops exactly as it always did on the rear axle, and nothing is being damaged. The half where the axle will not release is a different problem and has its own entry, because that one does damage things.
Transfer caseWorks worse
- Problem
This is the expensive half of the same vacuum-actuated front axle. When the clutch stays engaged after you have asked for two-wheel drive, the front… and rear axles are tied together on a surface with grip, and on dry pavement they cannot both be right about how far the truck has travelled through a corner. Something has to give up the difference, and on this truck that something is a tyre chirping, the steering fighting back, and the driveline winding up until it releases with a bang. Do that repeatedly and the wear lands in the transfer case and the front axle, which is why this entry is marked as damaging and its twin — the axle that never engages at all — is not. There is one thing to check before assuming a fault, and it costs nothing. Super Select is designed to be used with the centre differential open on pavement, and if the truck has been left in a locked mode it will bind exactly like this while behaving completely correctly. Get out of the locked mode, drive in a straight line on a loose surface to unwind what is stored in the driveline, and see whether the complaint is still there. If it is, it is the control side or the actuator, and the supplier's own note about matching the hose routing when a solenoid is replaced is worth heeding: crossed hoses turn 'will not engage' into 'will not release'.
Transfer caseDamages other parts
- Problem
One owner told the federal regulator they had replaced the front discs five times in four years, ending each time in metal-to-metal grinding and a… pedal that needed far more effort than it should. That is a single report and this entry is tiered at the bottom of the site's scale to say so. It is published because the pattern it describes — new front brakes that do not last — almost never means the parts were bad, and almost always means something is holding the pads against the disc after you take your foot off. The four causes below are the usual suspects, in the order that costs least to eliminate. One extra warning from a second complaint in the same records: check the length and run of the flexible hoses whenever the truck goes up on a hoist, because a hose pulled tight as the suspension hangs is a hose being damaged. Brakes are safety-critical. Grinding brakes still stop the truck, but with less margin than you think and no margin at all when they are hot: keep speeds down, leave more room, and get this to a qualified mechanic rather than putting it off.
BrakesWorks worse
- Problem
Mitsubishi ran two separate United States recall campaigns on the front flexible brake hoses of this generation. The first says the wheel-side hose… can crack when the steering is at full lock and the suspension at full travel — the two things that happen together every time the truck is manoeuvred hard or driven off pavement. The second, a much smaller campaign, covers cracking of the lower hoses. Either way the result is the same: fluid escapes from one front circuit, the pedal travels further than it should, and the truck stops on less than it was designed to stop on. These are the original rubber hoses on a truck that is now decades old, so age and heat have done their own work on top of whichever defect the campaign described. Both campaigns are United States ones filed with NHTSA; a truck imported from another market was never part of them, and nothing here says what any other market's authority required. Whatever the paperwork says, flexible brake hoses are a wear item with a service life, and on a truck this age they are inspected on their condition, not on their recall history.
BrakesSafety-critical
- Problem
The rigid front brake lines pass through a hole in the inner fender. Mitsubishi's United States recall says that when a line is not centred in that… hole it rubs on the edge, and the rubbing eventually opens pin holes in the wall of the line. The remedy the campaign describes is telling: a line still centred is simply bent back into place, and only a line already worn is replaced. That means the fault is progressive and silent for a long time — there is nothing to feel until the wall finally opens and pressure escapes. Owner reports filed with the same agency describe the same class of failure elsewhere on the run, with lines routed close enough to a neighbouring pipe to wear against it. On a truck of this age, corrosion works on the same lines from the outside, especially where they run behind a wheel that throws salt or coastal grit at them. A brake line that is leaking is not a defect you drive with, and finding the leak is not the same as knowing the rest of the run is sound.
BrakesSafety-critical
- Part
The seal at the front of each cylinder head, behind the timing covers. It is a known leak point on this V6, and the oil it drops lands on the timing… belt — which is the reason it matters more than a small seal usually would. The truck takes one per head, so the quantity above is what you order for the pair. This is the classic "do it while you are in there" part: replacing it costs a seal and a few minutes on a job you are already paying for, and skipping it means paying for the same access twice. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD372536
- Part
The seal behind the crankshaft sprocket, at the very front of the engine. Getting to it means the crank pulley and the timing covers are already off,… which is why it is on every sensible timing-belt parts list and almost never worth a trip of its own. A leak here drips onto the timing belt from below, and oil on a toothed belt is the start of a short story with a bad ending. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD372249
- Problem
The front suspension on this generation is sprung by torsion bars, and a torsion bar is a coil spring that has been straightened out: it settles with… age exactly as a coil spring does, and it settles further and unevenly once a winch bumper or a bull bar goes on the front. The one cited club thread is about a later, second-generation truck, not this one — the torsion-bar front end carried over, but nobody in the sources has confirmed the detail on a first-generation truck, which is why this entry carries the site's weakest confidence tier. Owners in that thread describe the layout — an anchor arm at the chassis end of each bar with an adjusting nut and a locknut, the adjuster hidden under a domed rubber cover that is the reason most people cannot find it — and the fact that slackening the locknut and tightening the adjusting nut raises that corner. Two cautions the thread does not spell out and this page will. Raising the front changes the front geometry, so a wheel alignment belongs in the same visit. And ride height is not free travel: the higher you wind it, the less suspension is left and the harder it rides. Suspension is safety-critical; if you are not confident setting both sides equally, have a qualified mechanic do it with the alignment.
SuspensionWorks worse
- Part
The lower ball joint in each front corner. The truck takes the quantity above, one per side, and the genuine part is supplied with a new castle nut… and cotter pin — do not reuse the old pin, and do not let anyone talk you into reusing the nut. The specialist selling it recommends OEM here specifically on the grounds that aftermarket joints do not stand up to larger tyres and off-road use, which is exactly the load a Costa Rican truck that works past the end of the pavement puts on them. A worn lower ball joint is not a noise problem, it is a separation risk: if there is play here, the wheel can leave the truck. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
SuspensionMR496799
- Problem
Mitsubishi recalled late fourth-generation trucks because the right-hand front lower control arm could break at a weld joint made by a faulty welding… process. The European alert cited below classes the risk as serious and states the failure mode plainly: the arm might break in normal use. It records the affected trucks as two model years; a separate Australian campaign covers the same defect, but no Australian record was reachable to cite, so this entry is scoped to the European record and owners elsewhere should run their own market's look-up. A lower control arm is what holds the bottom of the front wheel in place, so losing one is losing control of that corner — this is not a noise you drive to the shop with. The complication is that a worn bush or ball joint in the same arm makes almost exactly the same clunk, and the two demand very different urgency, so the first step here is the vehicle identification number and not the stethoscope. If the truck is in the affected build range and the recall has not been done, it should be recovered rather than driven. Suspension is safety-critical: have this inspected and repaired by a qualified mechanic.
SuspensionSafety-critical
- Part
The rubber damper and dust boot that sits over each front shock shaft, one per side. It keeps grit off the shaft — which is what decides how long a… shock seal lasts on a road that is half gravel — and it takes the hit at the end of upward travel. Read the seller's note before ordering: some replacement shocks arrive with their own damper and boot already fitted and do not need this part, while others do not, so check what is in the box before you buy two of these. It is a rubber part on a truck old enough for every rubber part to be original, so if the strut is apart, look at it. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
SuspensionMR448172
- Modification
The front set for a Gen 3 covers three separate things — the front undercarriage, the oil pan and the transmission — and it is sold either in steel… or in marine-grade aluminium. The supplier publishes the thickness of each material, the weight of each individual plate in both, and the percentage by which the aluminium set is lighter; all of those figures are in the first citation. It also states, in its own words, that steel bends when it is hit and can be hammered back, while aluminium gouges more and is harder to reshape. Neither of those is a defect: they are two different answers to the same impact, and which one you want depends on whether you can get to a workshop or have to keep driving.
Body
- Part
The rubber bushing that clamps the front stabilizer bar to the frame. There is one at each mounting point, and they wear as a pair, so replace both… sides at once — a fresh bushing on one side and a hard, split one on the other leaves you with the same knock. Worn bushings are a common source of a clunk over speed bumps and washboard, and they are one of the cheapest ways to make the front end feel tight again, often worth doing together with the sway bar end links. Confirm the bushing matches your truck before ordering: the catalogue itself notes that fitment can vary by year and market within this platform, and a bushing sized for the wrong bar is either loose or will not clamp, so let the counter check by part number. This is suspension work; if you cannot support the truck safely, take it to a qualified mechanic. The number and the fitment come from two independent parts catalogues, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
SuspensionMR374520
- Part
The left front link between the anti-roll bar and the suspension. Left and right are different part numbers on this truck, so this page covers one… side only and the right link has its own page — order by side. Worn links are the usual source of a knock over speed bumps and washboard, and they are one of the cheapest ways to make a Gen 3 feel tight again. Replace them in pairs even though they are sold singly: an old link on one side and a new one on the other gives you the noise back on the next bad road. The catalogue lists further OEM interchange numbers alongside this one; none of them has a page here yet, so let the parts counter cross-reference rather than insisting on a single number. This is suspension work; if the bar is under load or you cannot support the truck safely, take it to a qualified mechanic. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Suspension4056A106SL7840L
- Part
The right front link between the anti-roll bar and the suspension, and a different part number from the left one — which is the whole reason this… page exists separately. Everything else is the same story: they knock when they are worn, they are cheap, and they are worth doing as a pair on the same afternoon. If you are ordering by phone, give the counter the side as well as the number; "front sway bar link" alone will get you a fifty-fifty guess. The catalogue lists further OEM interchange numbers alongside this one; none of them has a page here yet, so let the parts counter cross-reference rather than insisting on a single number. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Suspension4056A105SL7840R
- Part
The upper ball joint in each front corner, one per side. Like the lower joint it arrives with a new castle nut and cotter pin, and like the lower… joint the specialist's advice is genuine only for a truck that carries weight or leaves the pavement. Check both joints on the same day: they wear at similar rates, they are reached through the same disassembly, and finding the second one loose a month after paying for the first is a self-inflicted wound. Ball joints are steering and suspension — if you are not equipped to check the play correctly or to torque the castle nut to the manual's figure, have a qualified mechanic do it. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Suspension4010A056
- Problem
A comfort failure rather than a mechanical one, but it is the fault most likely to leave a Montero unlockable in the rain, so it earns a place in the… first wave. The regulator and motor are supplied as one assembly for the later trucks, and the fitment note on that part is worth reading before ordering: the assembly the specialist stocks is listed for the last three model years of the generation only, so a truck from earlier in the run needs a different part even though the door looks the same. Before buying anything, separate a dead motor from a broken regulator and both of those from a switch or a loom fault in the door jamb, where the wires flex every time the door opens. The order of those three tests costs nothing and decides whether this is a part or a splice. This entry rests on one specialist supplier's parts listing, so it is filed at the weakest tier.
BodyWorks worse
- Part
The large rubber hose that carries fuel from the filler neck down to the tank. On a truck this age the original rubber hardens and cracks, and the… first sign is usually a smell of petrol while you refuel or a wet patch near the filler after a full fill. This is the fuel system: a perished filler hose is a fire risk, not an inconvenience, and it is not a part to keep driving on. Have a qualified mechanic confirm where the leak is coming from, because the filler hose and the tank's own valves can produce the same smell, and replace the hose with genuine fuel-rated line rather than whatever hose is on the shelf. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Fuel systemMR959820
- Glossary term
The filter between tank and engine. On diesels it is also the water trap, and draining it is part of ordinary maintenance in a wet climate.
Fuel system
- Problem
A factory safety recall, and one of the few faults on this truck that can start a fire without any warning light. The campaign describes it exactly:… with the tank full and the vehicle parked facing forward on an upward slope, the fuel tank leveling valve may stop sealing if the fuel expands as the ambient temperature rises, and fuel can then leak onto the ground. The manufacturer's stated consequence is fire in the presence of an ignition source, and the remedy was to replace the valve. The pattern is what identifies it: no leak on level ground, no leak with half a tank, a puddle and a smell after the truck has sat nose-up in the sun on a full one. It is worth knowing that owners also report fuel leaking at the rear wheel well without that pattern, and one reports a leak that came back after the campaign repair — so a smell of fuel that does not fit the slope-and-full-tank picture still needs finding. Costa Rican driveways and parking spots are rarely level, which makes this a more likely find here than the campaign's home market would suggest.
Fuel systemSafety-critical
- Glossary term
fuel pumpbomba de combustible
The pump that feeds the engine, electric and inside the tank on injected versions. Running the tank very low on a hot day is hard on it, because the… fuel is what cools it.
Fuel system
- Glossary term
Tank, pump, lines, filter and injectors or carburetor. The cited Costa Rican catalog names the components — bombas eléctricas para combustible, línea… de combustible — rather than this heading, which is the site's own category term. Safety-critical: gasoline vapor and a hot exhaust are in the same engine bay, and fuel work belongs to a qualified mechanic if there is any doubt about the state of a line.
Fuel system
- Part
A valve on top of the fuel tank that lets the tank breathe while keeping liquid fuel from escaping — the part that is meant to seal when the truck is… tilted or overfilled. When it stops sealing, the classic sign is a smell of petrol with a full tank, worst when the truck is parked nose-up on a slope, and sometimes a wet patch under the rear. This is the fuel system and a raw-fuel leak is a fire risk, so treat it as a stop-driving fault and have a qualified mechanic find which valve or hose is leaking before you buy anything. The count is not the same across the generation — the earliest trucks carry more than one of this valve where the later trucks carry one, so confirm how many yours takes for your exact year before ordering. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Fuel systemMR512157
- Glossary term
The sacrificial link that protects a circuit. A fuse that blows again is reporting a fault; fitting a bigger one is how vehicles catch fire.
Electrical system
- Glossary term
The static seal between two bolted faces. Costa Rican directories list whole shops under empaques, because on an engine of this age there is always… another one to replace.
Engine
- Glossary term
Spark-ignition fuel — petrol in British and Australian usage. Costa Rica sells it by octane grade at state-regulated prices; the grade a Montero… needs comes from its own documentation, not from what the pump attendant suggests.
Fuel system
- Glossary term
Mitsubishi's gasoline direct-injection system — inyección directa de gasolina — fitted to the 6G74 from the Gen 2.5 facelift through Gen 3 as a… Japanese-market engine; the Japanese catalog lists the Pajero's 3.5 V6 as 直噴GDI, while export cars of the same generations kept port injection. A GDI engine has its own fuel system, its own sensors and its own reputation for carbon build-up, so parts and procedures for it are never assumed to fit a non-GDI engine, and one outside Japan is an imported vehicle rather than a local one.
Fuel system
- Glossary term
gear oilaceite de engranajes
The heavy oil in the manual transmission, transfer case and differentials, which the Costa Rican shop floor also calls valvulina. Limited-slip… differentials need their own additive or their own oil, and leaving it out makes them chatter in tight turns.
Fluids
- Problem
Both differentials on this truck use seals at the pinion nose and where the shafts leave the housing, and the specialist supplier lists four separate… part numbers to cover those positions — which is a fair map of where the oil comes out. The failure is slow and quiet, which is exactly the danger: the level falls over months and there is no gauge, no warning light and no noise until the gears have already been running short. A forum thread about the same axle notes that the distinctive smell of gear oil is usually what tells an owner first, before any stain is obvious. One cause worth checking before you condemn a seal is the housing breather. If it is blocked, the housing pressurises as it heats and pushes oil past seals that were doing their job perfectly well, and clearing it costs nothing.
DrivetrainDamages other parts
- Part
Mitsubishi's own SP-III automatic transmission fluid, sold by the quart under the number above. This is the one place on a Gen 3 where using "a good… ATF" instead of the specified one is a genuinely expensive mistake: the specialist who sells it says they have seen more than one Gen 3 transmission ruined by non-OEM fluid, and says it plainly enough that it is worth repeating. No quantity per vehicle is recorded here on purpose — the fill and the drain-and-refill amounts are different figures and both live on the cited page, so read them there rather than trusting a memory of them. Some brands now sell an SP-IV described as backwards compatible; the seller is not making that jump, and neither is this page. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
FluidsMZ320200
- Glossary term
glow plugbujía de precalentamiento
The heater plug that warms a diesel's combustion chamber for starting. Costa Rican catalogs list them as bujías de precalentamiento; a diesel that… starts hard cold and clatters for the first minute is often asking for a set.
Engine
- Modification
The factory size on a third-generation Montero is listed in two of the citations below, and the usual 33-inch answer for a 16-inch wheel is… 285/75R16. The tire calculator cited here gives the overall diameter of both sizes, the difference between them as a figure and as a percentage, and what the speedometer reads once the bigger tire is on — those are the numbers this decision actually turns on, and they are in the citation rather than repeated here. What the calculator cannot tell you is the second half of the bill: a common 33-inch all-terrain in this size is a light-truck tire with a stiff ten-ply casing and a per-tire weight the fourth citation states, and every one of those pounds is unsprung and rotating.
Wheels and tires
- Glossary term
What goes into u-joints, ball joints and wheel bearings. Type matters — a wheel-bearing grease and a chassis grease are not the same product.
Fluids
- Problem
This is the other blinking-light fault, and it is not the same one as the transfer case switches. When the green front-wheel symbols blink rather… than the amber centre-diff symbol, the front axle is having trouble engaging or disengaging, and the part the specialist supplier names as the usual culprit is the freewheel clutch control solenoid — a vacuum valve that is easy to reach and quick to change, and one they recommend carrying spare. Around it are the vacuum hoses on the right inner fender and the clutch actuator diaphragm on the front differential itself, and Spanish-language owner threads describe both: a solenoid valve that fixed it outright, and a differential clutch actuator diaphragm replaced alongside it. Owners also report the clutch sticking on trucks whose four-wheel drive is never used, which is an argument for exercising it rather than a fault to buy parts for.
Transfer caseWorks worse
- Glossary term
The return path to the battery through the body and the engine. Corroded ground straps cause faults that look like everything else — dim lights, odd… gauge readings, a starter that clicks.
Electrical system
- Problem
The most avoidable transmission failure on this truck is a fluid decision. The specialist supplier who assembles the service kit says it in one… sentence: they have seen several of these transmissions ruined by shops using the wrong fluid, which is why their kit ships with the manufacturer's own fluid and a printed copy of the factory procedure. An owner complaint filed against this generation describes grinding from the transmission on a truck whose owner had every required service done, with a quote in the thousands, so the downside is real. The practical consequence is an order of operations: the first question is which fluid went in last, by name, not what the symptom is. The specification is on the parts list below rather than in this paragraph, so there is one place to read it and one place to get it wrong.
TransmissionDamages other parts
- Glossary term
The gasket sealing the head to the block, holding combustion pressure in and keeping coolant and oil apart. A failed one shows up as white smoke,… coolant loss with no puddle, or oil that looks like coffee with milk.
Engine
- Problem
The cited overland thread follows one first-generation truck with the 3.0 V6 whose owner is working through a blown head gasket, with a cracked head… raised as the thing that sometimes turns up beside it. That is a single truck in a single thread, so this entry sits at the site's weakest confidence tier: read it as a well-informed starting point, not as a statement about how often this engine does it. The reason to publish it anyway is the ordering below. A head gasket is expensive and a cooling system fault is cheap, and on a truck of this age the cooling system is very often what killed the gasket. Be careful how much weight you put on the thread here: the owner reports the radiator as being in good shape, and it is a member's suggestion — not a finding — that a radiator problem may have been one reason the gasket blew. That is a hypothesis worth testing cheaply, which is exactly what it is used for below. So the diagnostic steps here deliberately test both, and the cheap fix path exists on its own: if you replace a gasket without curing the reason it overheated, you will replace it again. Once coolant and combustion are mixing, keep driving and you turn a gasket job into a head job, or a block. That is why the triage is do-not-drive even though the engine will usually still start and move.
EngineDamages other parts
- Glossary term
The front lamp assembly. Costa Rican parts listings say farol — farol principal — and catalogs also file the same assemblies under silvines. Headlamp… aim is checked at Costa Rica's RTV and at the UK MOT alike, and it changes when the suspension height changes.
Electrical system
- Glossary term
The engine cover — the bonnet in British and Australian usage. Its release cable and its support strut are both things that fail quietly and are… noticed at the worst moment.
Body
- Glossary term
The part the wheel bolts to and turns on. Its bearing is a wear item and a safety item: play or a growl that changes when the vehicle is steered is a… reason to stop and have it looked at.
Wheels and tires
- Glossary term
The arm on the opposite side from the pitman arm that supports the linkage. A worn idler arm is a classic cause of wandering steering on an older… four-wheel drive.
Steering
- Problem
A long-running Spanish-language owners' forum thread devoted to this engine's injection pump describes it as a defect the engine simply has, with one… experienced member writing that they all come to it sooner or later, and warning that a truck left with the worn seal will fail to start cold and will get worse each time. A buyer's guide for this generation names the same thing more briefly, listing injection pump seal leaks among the fuel-system items to expect and attributing them to ageing seals. The two agree on the shape of it: this is a wear item on a mechanically injected diesel, not a design catastrophe, and the seal itself is a cheap part. What makes it worth its own entry is the gap between that part and the bill. The forum thread's whole point is the gap between the two: the seal itself sits at the very bottom of the cost band, and the quote the poster was given for the same job sat at the top of it, because getting to the seal means the pump comes off and goes back on, and a distributor pump that goes back on wrong does not run. The fix path below carries the whole span as a band rather than a figure, which is the only honest way to state a price that depends on your market, your currency and your year — where you land inside it is decided by who does the work, not by the part. The cold-start-only pattern is what points here rather than at the glow plugs, which fail with the same complaint and are far easier to check first. Diesel around a hot engine is a fire risk: if you can see fuel dripping rather than a damp film, that is a different and more urgent problem and the truck stops until it is fixed.
Fuel systemCan strand you
- Glossary term
The valve that sprays fuel into the intake or the cylinder. Dirty or leaking injectors show up as rough idle, poor economy and a smell of fuel after… shutdown.
Fuel system
- Problem
The fourth-generation diesel uses a high-pressure pump feeding a common rail and electronic injectors, which is a different system from the earlier… trucks and wears differently. The cited source describes what high-mileage wear looks like: harder cold starting, a slight misfire at idle, fuel consumption creeping up, and eventually smoke under load. It calls this normal wear on precision components rather than a defect, and this entry follows it at the site's weakest confidence tier because it is a single source. The practical point is the order of elimination. Injectors and pumps are the expensive answer and the fashionable diagnosis, and three cheaper things produce the same symptoms — a tired fuel filter, water or dirt in the fuel, and failing glow plugs. Work through those first. Fuel systems are safety-critical: high-pressure diesel injection is not a system to open casually, so have the testing and any repair done by a qualified diesel specialist.
Fuel systemWorks worse
- Problem
Among the steering complaints filed with the United States road safety agency for this generation there is one that stands apart from ordinary wear:… an inner tie rod described as having pulled out of the threaded tube it screws into, with the driver losing steering control at the moment it let go. Reports name it in more than one model year. It is worth separating from the everyday worn joint because the failure mode is different. A worn ball joint gets loose, then vague, then noisy, and gives you months of warning. A rod that unscrews from its adjuster gives you the same vague steering for a while and then nothing at all, and the difference between the two is not something you can feel from the seat — it is something you find by putting your hands on the linkage. This truck's steering linkage is long, exposed and full of adjusters that are held by clamps, and every one of those clamps has spent decades in water and grit. Any new looseness, clonk or change in how the truck tracks is checked before it is driven, not after. If the linkage has play and you are not equipped to measure it, that is a tow, not a test drive.
SteeringSafety-critical
- Glossary term
The paper the parts counter or the shop gives you. It is worth keeping: it records what was fitted and when, it is what a warranty claim rests on,… and for this site's build log it is where a cost comes from.
General terms
- Glossary term
In Spain, the inspección técnica de vehículos — that country's periodic inspection. The abbreviation is also used in Costa Rica by DEKRA for the… service Costa Rican law and everyday speech call the RTV, so the country has to be stated whenever the term is used. It never means the British MOT.
General terms
- Glossary term
What lifts the vehicle. Costa Rican tool catalogs list them in the feminine, as gatas — gata hidráulica, gata de botella, gata de tijereta — though… gato is also read locally, and gato hidráulico is what the box itself often says. A jack lifts, it does not hold: nobody goes under a vehicle held up by one, and the lifting points are the ones the manufacturer specifies, not whatever looks solid.
Tools
- Glossary term
The stands the vehicle rests on once it is lifted, on firm level ground, with the wheels chocked. Costa Rican catalogs sell them as soportes para… vehículos and, on the shop floor, as burras or burros. This is the single most important safety habit in home mechanics.
Tools
- Problem
The mount at the top of each front strut carries the whole corner and lets the strut rotate with the steering, and it is the noise nobody attributes… correctly. Because it lives under the hood rather than under the truck, a knock from here reads to most people as a suspension problem down at the wheel, and the parts that get replaced first are usually the wrong ones. The supplier who stocks the replacement is realistic about it: the factory metal top hats can usually be reused when other strut components are changed, and it is the rusty or broken ones that need replacing. That is the whole diagnosis in one sentence, and it takes opening the hood to make. In a wet climate with salt-free but constantly damp air, corrosion at the strut top is worth a look every time the hood is up for anything else.
SuspensionWorks worse
- Problem
The links that tie the front sway bar to the suspension are short, they carry every roll input the bar generates, and they are among the first things… on this truck to start knocking. The knock is loudest over small, sharp bumps and quietest on smooth road, which is what separates it from a worn bushing further inboard. The left and right links are different parts, so replacing one means ordering the correct side, and the supplier who stocks the genuine ones warns specifically that on trucks running larger tires the aftermarket links do not hold up to the extra load — worth knowing before you buy the cheap pair twice. This entry is scoped to a link that is worn and knocking. A link that has actually come apart changes how the truck behaves in an avoidance manoeuvre, and that is not a drive-gently situation.
SuspensionWorks worse
- Glossary term
A stack of steel leaves used as a spring, mostly at the rear of load-carrying versions. Cracked leaves and flattened packs are common on trucks that… have carried weight for twenty years.
Suspension
- Glossary term
A spacer fitted above a front strut or a coil spring that raises the body without changing the spring itself. It is the cheap, reversible half of a… lift: the spring rate, the articulation and the load capacity stay exactly as they were, and what changes is where the suspension sits in its own arc. In Costa Rica it is sold as a calza, and shops shelve lift parts as «kit levante». Do not walk in and ask for an espaciador — Costa Rican shops use that word for «espaciadores de aros», the very different part that pushes a wheel outboard, and you would be sold the wrong thing. Elsewhere in the region espaciador does name this part, which is why it is recorded here as a variant to recognize rather than one to use.
Suspension
- Modification
A third-generation Montero rides on coil springs at all four corners, so a lift here is a spring decision before it is anything else. The specialist… that supplies this generation sells its springs in two raised-height classes and in duty bands, and the two are independent: height is how far the body sits off the axles, duty is how much permanent weight the spring was chosen to carry. What makes that second axis usable is that the supplier states each band as a *range of added constant weight* and names the accessories it expects in each one — which is how you find your band without owning a scale. All of those figures, and the caveat that even a difference in factory trim moves which spring suits a given truck, are in the first citation. Spacers are the other half of the story and the half that gets oversold: the same supplier publishes what a thin strut-top spacer actually adds, and warns in the same breath about what a large one does to the suspension's arc.
Suspension
- Problem
Steering that has gone vague is the most ordinary complaint on a truck of this age and the easiest one to live with until it is not. Owner reports… filed with the United States road safety agency across this generation describe the whole range of it: a truck that drifts and needs constant small corrections, a wheel with a dead area either side of straight ahead, and in one report a column with enough front-to-back movement to be measured in inches. This truck steers through a recirculating-ball box, a pitman arm, a long relay rod and an idler arm on the other side, and every one of those is a wear point in series with the others. That is why the fault creeps: no single joint is badly worn, but five slightly worn joints add up into a wheel that does nothing for the first part of its travel. The reason to treat it as more than an annoyance is that free play hides the joint that is actually failing — a linkage with a lot of slop everywhere is a linkage where nobody can tell which part is nearly out. This entry is written from owner reports in aggregate; the ranking of causes is a starting order, not a diagnosis for your truck.
SteeringWorks worse
- Glossary term
The reduction gearing in the transfer case, for steep, slow and loaded work. It is selected stopped or nearly stopped, and it multiplies torque… rather than adding power.
Transfer case
- Glossary term
lug nuttuerca de rueda
The nut that holds the wheel to the hub. Torque matters in both directions — loose loses the wheel, over-tightened warps the brake disc and stretches… the stud — so it is torque-wrench work, not impact-gun work.
Wheels and tires
- Glossary term
The cross-shaped wrench for wheel nuts that lives with the jack. It loosens and it snugs; final tightening is a torque wrench's job.
Tools
- Glossary term
The transmission you shift yourself — manual gearbox in British and Australian usage. Whining that changes with road speed but not with engine speed… usually lives here or further back, not in the engine.
Transmission
- Glossary term
In Costa Rica, the annual payment that keeps a vehicle legally on the road — circulation rights plus the compulsory insurance, collected by the state… insurer and evidenced by a sticker on the windscreen. A Costa Rica-only term; the amounts and the rules are set each year by Costa Rican authorities and are outside the scope of this site.
General terms
- Glossary term
The person who does the work. Nothing on this site replaces a qualified mechanic on safety-critical systems — brakes, steering, suspension, fuel,… airbags, tires, towing and lifting.
General terms
- Glossary term
The name Mitsubishi's full-size four-wheel-drive wagon carries in Costa Rica and the Americas — Costa Rican parts sellers list it as the Montero,… while Mitsubishi's own Japanese catalog prints Pajero and its UK site Shogun. Montero Sport is a different, smaller model and is never a synonym for it.
General terms
- Glossary term
The periodic test that checks a vehicle against road-safety and environmental standards in the United Kingdom. Great Britain and Northern Ireland run… it under different rules — in Northern Ireland the test is booked through the DVA — so even inside the UK the detail depends on where you are. Jurisdiction-bound: an MOT says nothing about what Costa Rica's RTV or Spain's ITV will accept, and the three terms are never interchangeable.
General terms
- Glossary term
The muffler box in the exhaust, which damps the noise of the gas leaving the engine. Costa Rican directories list whole shops under muflas, and a… mufla shop will usually fabricate a section rather than sell you a whole system.
Exhaust
- Glossary term
OEM partrepuesto original
A part made or specified by the vehicle manufacturer, ordered by its own part number. In Costa Rica the parts counter calls it a repuesto original.
General terms
- Glossary term
A vehicle built to leave paved roads: body-on-frame or reinforced structure, high ground clearance and low range. The Montero is one.
General terms
- Glossary term
The spin-on filter the engine's oil passes through. It is changed with the oil, not every other time — the old one holds dirty oil that goes straight… back into a fresh fill.
Engine
- Problem
The kit supplier for this engine names the front camshaft seals as a common oil leak point and recommends replacing them on a fixed cadence rather… than waiting for them to weep — and the reason is not the oil you lose. These seals sit behind the timing covers, which means the oil they leak lands on the timing belt, and a belt that has been soaked in oil is a belt on borrowed time regardless of how new it is. The economics follow from the geometry: the labour to reach the seals is the labour of a timing belt service, so a seal replaced during that job is nearly free and a seal replaced on its own is not. If the front of your engine is wet and the belt history is unknown, read this entry and the timing belt one together — they are the same afternoon of work. This entry rests on one specialist supplier's product documentation, so it is filed at the weakest tier — the reasoning below is sound, but nobody has corroborated it here yet.
EngineDamages other parts
- Glossary term
The pan under the engine that holds the oil. On a vehicle taken off pavement it is also the part that meets rocks, which is what a skid plate is for.
Engine
- Problem
Mitsubishi recalled the analogue-gauge trucks of the model year this campaign is recorded against because the oil pressure gauge sending unit, on the… right-hand side of the engine, could leak. The recall notice names both consequences: engine damage from the oil that is no longer in the engine, and an engine fire if that oil reaches hot metal. The remedy was a modified sending unit. Two things make this worth writing down four decades later. The first is that an oil leak on the right-hand side of one of these engines has a specific, cheap, known cause worth checking before anything else. The second is that an oil-fed engine-bay fire is exactly the kind of failure this site exists to warn about: if you can smell burning oil, stop and look, and do not keep driving. Have this checked by a qualified mechanic.
EngineSafety-critical
- Glossary term
The lip seal on a rotating shaft. Most of the oil under an old Montero comes from one of these rather than from a gasket.
Engine
- Glossary term
Long-distance travel by vehicle where the journey and self-sufficiency are the point — camping gear, water, fuel and spares carried on board. The… word stays in English in Spanish prose on this site, because that is how Spanish-language 4x4 shops and magazines write it; there is no settled Spanish equivalent.
General terms
- Glossary term
The sensor in the exhaust that tells the engine computer how rich or lean the mixture is. A lazy one costs fuel long before it lights a warning lamp.
Fuel system
- Glossary term
The mechanical brake worked by the lever or the foot pedal, independent of the hydraulics. On a Montero it is often a drum inside the rear disc, and… it is what holds the vehicle on a slope while a jack is under it.
Brakes
- Glossary term
The manufacturer's identifier for one exact part. It is the only reliable way to order a part for a vehicle this old, because the same body can carry… different parts by market and year. A part number that is not in a cited source does not appear on this site.
General terms
- Glossary term
A business that sells vehicle parts, new or used. It is not the same thing as a taller: a repuestera sells you the part and normally does not fit it,… while the taller is where the work is done. The person behind the counter is the repuestero.
General terms
- Glossary term
The arm bolted to the output of the steering box that pushes the linkage. Its taper joint wears like any other steering joint.
Steering
- Problem
The third generation runs independent front suspension with an upper and a lower ball joint per side, and both are wear items on a truck this heavy.… A worn joint announces itself as a clunk turning into a driveway and a truck that wanders enough that you are always correcting it; a torn boot that let the grease out is what usually got it there. The supplier who stocks the genuine parts is explicit that on trucks carrying larger tires or working off-road, factory joints are the only ones they will recommend — a joint is not the place to find out an aftermarket part was optimistic. The triage here is deliberately drive-gently-repair-soon and not do-not-drive, because a joint with detectable play is not the same thing as a joint about to separate. If the play is gross, or the boot is gone and the joint is dry and notchy, stop driving it and get it looked at.
SuspensionSafety-critical
- Glossary term
The hinged gripping tool — combination, long-nose or locking. Costa Rican catalogs list them as alicates and tenazas.
Tools
- Glossary term
The hydraulic assistance that makes the steering light at parking speeds, driven by a belt off the engine. If it groans on full lock, check the fluid… level and the belt before condemning the pump.
Steering
- Glossary term
The hydraulic fluid for the steering assistance. Costa Rican catalogs sell it as líquido para dirección hidráulica; some systems take automatic… transmission fluid instead, and the two are not interchangeable by guess.
Fluids
- Glossary term
The tool that separates a taper joint or draws a bearing off a shaft. Costa Rican catalogs list extractores de rótulas among them; hitting the joint… with a hammer instead is how the knuckle gets damaged.
Tools
- Glossary term
The heat exchanger at the front of the vehicle. Plastic end tanks go brittle with age, and a Montero that runs hot only when climbing is often… telling you about airflow or a tired radiator rather than about the thermostat.
Cooling
- Glossary term
The fan that pulls air through the radiator when the vehicle is not moving fast enough to do it by itself — belt-driven through a viscous clutch on… most of this range. Costa Rican mechanics also call it the abanico.
Cooling
- Glossary term
The handle that drives a socket one way and freewheels the other. Costa Rican tool catalogs list it in English, as the ratchet.
Tools
- Problem
Australian-market owners describe this one in detail: a shaft works its way partway out of the rear differential, gear oil escapes past it, and the… first sign is usually the smell and a stain rather than a noise. Mitsubishi Australia issued a field service notice rather than a recall — meaning the revised companion shafts, fitted with heavier retaining circlips, are supplied when a shaft actually fails rather than pre-emptively. One dealer in the thread had seen enough of them for the count to be worth quoting — it is in the citation — and a second owner in the same thread was one of that dealer's cases. The reported pattern is towing heavy loads, a lift, or both. A healthy shaft has a few millimetres of movement at the differential; a failing one moves in and out to the limit of the constant-velocity joints, and that difference is the test. Read the tier on this entry before you act on it: everything here comes from one forum thread, which is why it is filed as an owner account rather than as settled community knowledge. It is scoped as do-not-drive for the component rather than for the driver — nobody gets hurt, but a differential run without oil stops being a shaft-and-seal job and starts being a differential.
DrivetrainDamages other parts
- Part
The side seal at each end of the rear differential, where the axle shaft passes through the housing — the quantity above is the pair. This is the… seal that matters when a rear side shaft has been creeping outward: the shaft moving takes the seal's sealing lip with it, and gear oil follows. Read the catalogue page before ordering, because the differentials use four different seals in total — front side, front pinion, rear side, rear pinion — each with its own Mitsubishi number, and only this one has a page here so far. Ordering "a differential seal" without saying which will get you the wrong one three times out of four. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
DrivetrainMR350883
- Part
The tee that splits coolant off to the rear heater, on the trucks that have one. It corrodes where the metal meets the hose and then weeps, and… because it sits under the body rather than in the engine bay the loss shows up as a slowly falling reservoir and a smell rather than as a puddle you can see from the driver's seat. The truck takes the quantity shown above, and the sensible order is both plus the hoses, since the hose clamps are what you disturb getting at them. The catalogue also lists an interchange number for this part; it has no page here yet, so ask the counter to cross-reference rather than assuming this is the only number that will come up. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
CoolingMR958633
- Problem
The trucks fitted with the rear heater carry the coolant a long way back and return it through plastic tee joints in the middle of the vehicle. The… specialist supplier's standing advice is to replace those tees preventively whenever the cooling system is already drained, and their reasoning is the whole entry: if one of the old plastic pipes breaks, all of the vehicle's coolant drains out, which can overheat the engine and turn a cheap plastic fitting into cylinder head work. That is why this sits at do-not-drive. Nobody is hurt by it, but the distance between the puddle and a warped head is measured in minutes of running, and the temperature gauge on a system that has already emptied itself does not necessarily rise in time to be useful. If your Montero has rear heating and you are already draining the system for something else, this is the cheapest insurance on the truck. This entry rests on one specialist supplier's standing recommendation, so it is filed at the weakest tier — the consequence it describes is severe, and it is still one source.
CoolingDamages other parts
- Modification
The route to a different final drive that anyone has actually documented on this generation is not a new gear set: it is fitting the differentials… from a truck that left the factory geared shorter, which is the job the video cited below walks through end to end. Read the rest of this entry knowing that its evidence is thin and that its two sources disagree. The video, writing about the US market, says the 2001-2002 XLS is the model that carries the shorter gearing and that everything else from 2001-2006 does not; the forum list, covering the Pajero/Montero range globally, gives the same SOHC V6 engines one ratio with no such carve-out. Both figures are quoted in the citations. Neither source states what actually distinguishes one truck from another, and neither addresses whether differentials from the early cars interchange with the later ones — which is the premise the whole donor-swap idea rests on. Verify against your own two trucks before any money moves.
Drivetrain
- Glossary term
The switch that lets a small current control a large one. Swapping an identical relay from another circuit is the cheapest diagnostic in the fuse box.
Electrical system
- Glossary term
The bearing that pushes on the pressure plate when the pedal goes down. A noise that appears with the pedal down and vanishes with it up is this… bearing.
Transmission
- Glossary term
The shop where the vehicle is actually worked on. Costa Rican directories list them as talleres, usually specialized — taller mecánico, taller de… enderezado y pintura, taller eléctrico. A garaje or cochera in Costa Rica is where you park, not where the work gets done.
General terms
- Glossary term
A side bar engineered to take the vehicle's whole weight on a rock and let it slide off, which means it is anchored to structure rather than to sheet… metal. The word is doing real work: a Montero specialist declines to call its own full-length steel side rail a bona fide rock slider precisely because a monocoque body deflects too much at the factory mounts under a heavy hit. So a bar that bolts to the body is side protection, not a slider — and it is not a lifting point either, because a rated jack point is an engineered, tested feature and not a by-product of being made of steel. Ask what a bar mounts to before you trust it with the truck.
Body
- Glossary term
Costa Rica's periodic vehicle inspection — revisión técnica vehicular. It applies only in Costa Rica. When the Riteve contract ended the service… passed to DEKRA under a temporary uso precario arrangement granted by the MOPT rather than under a new concession; DEKRA's own Costa Rican site brands the service inspección técnica vehicular, ITV. RTV is not the British MOT and not the Spanish ITV; the requirements are set by Costa Rican regulation and nothing on this site should be read as a statement of what will pass.
General terms
- Problem
A buyer's guide written for this exact generation puts the cooling system on its inspection list and says why in one line: old radiators, old hoses… and tired viscous fans cause overheating, and on the diesels the bill that arrives afterwards is a cracked or warped cylinder head. That is the whole reason this entry carries the severity it does. Overheating is not itself an expensive fault — a radiator, a fan coupling and a thermostat are ordinary parts. What is expensive is the head that was cooked while somebody drove another few kilometres hoping the gauge would come down. It does not come down, and the damage is done in that few kilometres rather than over the following month. The pattern of when the gauge rises is most of the diagnosis and it costs nothing to observe: hot only in traffic and at low speed points at airflow, which means the fan; hot only when working hard on the open road points at the radiator's ability to shed heat; hot everywhere and quickly points at circulation. Stop, let it cool, and do not open a hot system — the coolant in there is above its boiling point and held down only by the cap.
CoolingDamages other parts
- Problem
One truck in the cited thread ran lean and failed its emissions test on both oxides of nitrogen and unburnt hydrocarbons, and members pointed at a… clogged exhaust gas recirculation path and at vacuum leaks. This is a single thread and it is tiered accordingly, but the shape of the advice is worth having because it says something specific about where to start: on a forty-year-old truck the rubber is the suspect before the metering is. Emissions rules are not universal — what a truck must pass, and whether it must be tested at all, depends entirely on the jurisdiction, and a US state test, a Costa Rican inspection and a British test measure different things to different limits. Treat the numbers on your own test slip as the evidence and this page as a method. Nothing here changes how the truck should be driven; it changes what it costs you to run and whether it passes wherever you live.
Fuel systemWorks worse
- Glossary term
The tool that reads fault codes and live data from the control units. A code is a starting point for diagnosis, never a shopping list.
Tools
- Glossary term
The tool that turns a screw by its slot or recess — flat, cross-head or Torx. Using one as a pry bar is how trim clips and knuckles get broken.
Tools
- Glossary term
seat beltcinturón de seguridad
The restraint itself, plus its retractor, its pretensioner where fitted and its anchor points. A belt that does not lock when tugged, or webbing that… is cut or frayed, is replaced — it is not adjusted.
Interior and trim
- Problem
The red release button on the front seat belt buckles goes brittle, cracks, and drops pieces of itself into the buckle mechanism. Mitsubishi recalled… it: the notice says in plain words that the belts would not protect an occupant in a crash. One owner complaint filed separately reports front and rear buckles failing together, which is the only cited evidence that the rear belts go the same way. This is a fault that does nothing at all until the moment it matters most, which is why the triage here is deliberately the strictest one: a seat whose belt will not latch and hold is a seat nobody should sit in, and a driver's belt that will not latch is a truck nobody should drive. A brittle button is also a good reason to look hard at the rest of a restraint that is decades old — webbing, anchor bolts, retractor. Restraints are safety-critical: have this work done by a qualified mechanic.
Interior and trimSafety-critical
- Problem
A recognisable cluster in the owner-complaint record for this generation: the engine vibrates at a standstill, the tachometer needle sinks towards… zero as though the engine is about to die, and it either catches itself or stalls and restarts without drama. The useful part of those filings is what happened next. One owner had the dealer change plugs and cables and was told to use premium fuel; the vibration was back within a week. Another had the idle speed control replaced after repeated stalling and kept filing. Nobody in the cited set reports the fault being cured on the first attempt — which says the symptom has more than one cause, and that parts-swapping in the dark is expensive. The triage is drive-gently-repair-soon rather than drive-normally for one reason: an engine that stalls unpredictably will eventually do it pulling into traffic. Get the codes read before anybody sells you an ignition service.
EngineCan strand you
- Problem
This is the single most-reported chassis complaint filed with the United States road safety agency for the later trucks of this generation. Owners… describe a steering wheel that has to be held with both hands, shaking that arrives in a narrow band of road speed, and — the part that matters for diagnosis — a fault that survived new tyres, repeated balancing and more than one visit to a workshop. One owner report goes further and names the front upper control arm joints and their bearings as what was eventually found — one report, not a pattern, and the causes below are ranked on how this failure usually goes rather than on that single account. The pattern worth trusting is the broader one: many owners, several model years, one complaint that survived the obvious fixes. When a vibration comes back after the wheels have been balanced twice, the wheels are usually not the story: something in the front end has enough freedom to let the wheel steer itself a little, and the tyre then feeds that movement back through the linkage. This is a heavy independent front end with torsion bars, and every joint in it is decades old. It is not dangerous the way a separated joint is dangerous, and the truck stays perfectly controllable at ordinary speeds — but shimmy is a symptom of looseness, and looseness in a front end is on a path that ends somewhere worse. Keep the speed down and get the joints measured.
SuspensionWorks worse
- Glossary term
The damper that controls how the spring moves. Worn dampers show up as float over dips, a wheel that patters on washboard gravel and longer stopping… distances — replace them in pairs, per axle.
Suspension
- Glossary term
The steel or aluminum plate under the engine, transmission or fuel tank that takes the hit from rocks. Fitting one adds weight and can trap heat, so… it is chosen for the terrain the vehicle actually sees.
Body
- Problem
The transfer lever pivots on a ball at its base, and a specialist supplier of parts for these trucks says plainly what happens to it: a lever that… has a lot of side-to-side movement, or that gives trouble shifting between modes, usually has an original ball that has disintegrated. They name it as most common on the later trucks of the run. An owners' forum thread about one of exactly those trucks describes the same fault from the driver's seat, with the owner comparing the lever to stirring a pot of thick, lumpy stew and other members naming the disintegrated ball immediately and pointing at the same part number. One of them adds a caution worth passing on: the replacement is the same part the factory fitted, so this is a repair that restores the lever rather than one that improves it. This is the cheapest fault on this whole set, and it disguises itself as the most expensive one. A lever that will not select four-wheel drive feels exactly like a transfer case that will not engage it, and the difference is a plastic ball the size of a thumb joint against a gearbox out of the truck. So the useful thing here is the order of checking: prove the lever is actually moving the mechanism before anyone opens anything. Nothing about this fault is dangerous and nothing is wearing out because of it — but a truck whose four-wheel drive cannot be selected is a truck that has lost the reason most people bought it.
Transfer caseWorks worse
- Glossary term
The cup that fits over a nut or bolt head and drives from a ratchet. Costa Rican catalogs sell them as cubos, in sets and singly — not to be confused… with the cubos de rueda libre on the front axle, which are hubs. Mexican catalogs and Mexican-made videos call the same tool a dado, which is why the word turns up in Costa Rican workshops; it is recorded here for search only, and never used in this site's Spanish, because dado is also the ordinary past participle of dar.
Tools
- Glossary term
Replacement parts for a vehicle, new or used. This is the everyday Costa Rican word and the one this site uses in Spanish; the shop that sells them… is a repuestera.
General terms
- Glossary term
The spare carried on the vehicle. On a Montero it hangs on the tailgate, which is also where its carrier, lock and cover give trouble. A spare that… is flat or badly aged is not a spare.
Wheels and tires
- Glossary term
The plug that lights the mixture in a gasoline engine. Reading a used set tells you a lot about how each cylinder is running.
Engine
- Glossary term
The clamp that holds a coil spring compressed while the suspension is apart. A stored spring is a stored injury: this is one of the jobs where the… right tool, or a qualified mechanic, is not optional.
Tools
- Glossary term
The motor that cranks the engine. A single loud click with lights that stay bright is usually the solenoid or a cable, not a flat battery.
Electrical system
- Modification
This is the entry where the Gen 3's body structure decides the answer. The Montero specialist that sells a full-length steel rail for this truck says… in its own product copy that it does not consider the part a bona fide rock slider — partly because of the steel, but mainly because the Gen 3's monocoque sheet-metal body lets the factory mounting points deflect too much under a heavy impact. That is a statement about the truck, not about that particular rail, and it applies to anything that hangs off the same mounts. What a rail like this genuinely gives you is protection from parking-lot damage, brush and small strikes, plus a step; what it does not give you is a structure you can rest the vehicle's weight on.
Body
- Glossary term
The recirculating-ball gear used instead of a rack on many four-wheel-drive vehicles, driving the pitman arm. Its adjustment takes out some free… play, but a box worn inside is replaced, not adjusted tighter.
Steering
- Problem
One owner described the mechanism to the federal regulator clearly enough to be worth recording: road grime and salt pit the shaft where it enters… the steering gear, the rough shaft tears the seal, the lubrication leaves, and the truck becomes hard to steer and will not return to straight on its own without being helped round. That is a single report, which is why this entry carries the weakest confidence tier on the site — read it as one plausible explanation among several, not as an established pattern. The reason it earns a page anyway is that the symptom is common on trucks of this age and the four causes below are cheap to tell apart in the order given, starting with the fluid. Steering is safety-critical. Heavy steering is not the same as no steering, so the truck is drivable, but a wheel that does not come back to centre is a wheel you are fighting: get it looked at by a qualified mechanic rather than living with it.
SteeringWorks worse
- Glossary term
The rack-and-pinion assembly that turns rotation of the wheel into side-to-side movement of the tie rods. Not every Montero has one — several… versions use a recirculating-ball steering box instead — so check which your vehicle has before ordering parts.
Steering
- Glossary term
The wheel itself. On vehicles fitted with a driver's airbag the wheel is also an airbag housing — never work on it as if it were only a wheel.
Steering
- Problem
A buyer's guide written for this generation puts corrosion at the head of its inspection list and says exactly where to look: rear arches, sills,… body mounts and the frame itself, with the frame rails, the rear crossmember and the floor pans called out as inspection points. It adds the sentence that matters most to anyone deciding what to do about it — repairs quickly exceed what the truck saves you. That guide is the only source here for the frame and body-mount half; the owner reports cited alongside it establish something narrower and worth having anyway, which is that owners of these trucks have taken corrosion severe enough to need parts replaced to a national regulator, in their case at the rear door hinges. Read that as evidence these bodies rot, not as evidence about any particular frame. This is a body-on-frame truck, so the rust question splits in two and the two halves are not equally serious. Corroded arches and sills are metal and money. Corroded body mounts and a corroded frame are structure: they are what holds the cab to the chassis and the suspension to the truck, and there is no cosmetic version of that. That split is why this entry carries the safety framing even though its severity is written as damaging — the fault destroys the truck slowly, but it destroys a part of the truck whose failure is not slow. The other reason to look properly is that corrosion is the one fault that gets deliberately hidden. Fresh underseal on a truck of this age is a question, not an answer, and the honest test is still a light tap: sound metal rings, tired metal thuds.
BodyDamages other parts
- Glossary term
Mitsubishi's four-wheel-drive system with four settings: rear-wheel drive in high range, four-wheel drive in high range with the center differential… open, the same with the center differential locked, and four-wheel drive in low range with it locked. The open-center setting is what lets it be driven on pavement in four-wheel drive, which an Easy Select vehicle cannot do. It is the third-generation development of Super Select; the earlier generations carry the original system. The Japanese catalog cited here covers 1999 to 2006 — the generation span this entry declares comes from the site's vehicle taxonomy.
Transfer case
- Part
The gasket between the surge tank and the lower intake manifold on the larger petrol V6 — the one that always has to come off when the… variable-intake butterflies are rebuilt, deleted or the tank is swapped. Read the catalogue page before you order: the surge tank job needs three different gaskets, this one plus a left and a right plenum gasket, each with its own Mitsubishi number, and the other two do not have pages here yet. Ordering one and discovering the other two at the bench with an open intake is the failure mode this paragraph exists to prevent. No quantity per vehicle is recorded here because the catalogue does not state one for this position. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMR561584
- Glossary term
A kit of springs, dampers and spacers that raises the body relative to the axles for clearance and bigger tires — sold in Costa Rica as a kit de… levante. It changes geometry, driveshaft angles and headlamp aim, and in many jurisdictions it changes what an inspection will accept: in Costa Rica that is the RTV, and the rules are set there, not here.
Suspension
- Glossary term
sway barbarra estabilizadora
The transverse bar that ties the two sides of an axle together and limits body roll in a corner — anti-roll bar in British usage. Its rubber mounts,… sold in Costa Rica as hules de estabilizadora, knock when they go.
Suspension
- Glossary term
The short link, with a ball joint at each end, that connects the sway bar to the suspension at one corner. Left and right are usually different… parts. A worn one knocks over small bumps and is one of the first noises a heavy truck develops. Spanish-language parts catalogues for the Montero list it as a bieleta.
Suspension
- Glossary term
The rear door. On most Monteros it is side-hinged and carries the spare wheel, so its hinges, its strut and its lock all work harder than a normal… door's.
Body
- Problem
Owner reports filed with the United States road safety agency include rear door hinges corroding badly enough to need replacing. There are two of… them and both are from one model year, so the fitment above is narrowed to that year rather than spread across the generation — the same rule applied elsewhere in this set, and the same caveat: if your truck is an adjacent year the inspection below still costs nothing, but nothing here claims your year is affected. The buyer's guide cited alongside establishes that these bodies rot at the arches, sills and mounts; it does not mention hinges, and is not the source for them. It is a small fault next to most of what is on this site, and it earns its place because of what it tells you rather than what it costs. The tailgate carries a heavy spare wheel on a side-hinged door, and those hinges are bolted to a panel that sits at the back of the truck collecting everything the rear wheels throw at it. When the hinges have gone, the water that killed them has been sitting there for years, which means the panel behind them and the bottom of the gate itself are worth looking at before anyone orders parts. The trap is ordering hinges for a truck whose problem is the panel they bolt to: new hinges on soft metal sag again in a season and the money is gone. There is a genuinely cheap version of this and it is worth trying first — a gate that has dropped a little often latches again after the striker is adjusted, and a gate whose drains are clear stops feeding the rust that started all of it.
BodyWorks worse
- Problem
Fourth-generation trucks across several markets were recalled because the airbag inflator's propellant degrades with heat and humidity, and a… degraded inflator can burst its metal housing instead of inflating the bag, firing fragments at the people it is meant to protect. The Australian and European regulator records cited below say so in those words. This is a fault with no symptom: nothing about the truck changes, nothing lights up, and the fault only exists at the one moment you would want the airbag to work. Only one of the cited records classifies the inflator by type — the Beta passenger inflator, on the 2013 to 2017 trucks — so do not read a type off this page for the earlier ones. The only diagnosis is to check the vehicle identification number with the manufacturer and to get the completion record if somebody tells you it has been done. Costa Rica is a hot, humid market, which is the exact combination the recalls name as the accelerator. The replacement is free under the recall in the markets that issued it, and a free repair with no expiry is not a repair to defer. Restraints are safety-critical: this is dealer work, not driveway work — never attempt to remove or handle an undeployed inflator yourself.
Interior and trimSafety-critical
- Problem
Owners on a long-running overland forum treat age-related sag on these trucks as simply given: a thread asking for a stock ride-height figure gets… the answer that after this many years of settling and adjustment no such measurement is useful any more, and another member assumes their own high-mileage truck has sagged without needing to check. Read that for what it is: a remark about the whole truck settling, made in a thread that was really about front torsion-bar adjustment, not a measurement of these rear springs. Specialist suppliers sell rear coil springs for these trucks graded by how much constant added weight they are meant to carry, with raised options above that, which tells you the same thing from the other direction: the standard spring was chosen for an unladen truck, and a great many of these have spent their working life with a load in the back. Nothing here is a factory figure — there is no published stock height in this entry precisely because the people who own these trucks could not produce one. This is the thinnest evidence base in this set: one owners’ thread and one supplier’s catalogue. Everything below is a measurement you take on your own truck for that reason, rather than a specification you check it against. What sag actually costs you is not comfort. A truck sitting low at the rear has less travel left before the axle meets its stops, so every dip becomes a hit; its headlamps point higher than they should at exactly the moment the back is loaded and the road is dark; and the rear tyres sit closer to the arch than the designer intended. None of that makes the truck undrivable, and none of it arrives suddenly — which is why it is worth measuring rather than eyeballing, because a truck that settles a little each year never looks wrong to the person who drives it every day.
SuspensionWorks worse
- Problem
A recurring complaint on this generation, and one whose repair sits somewhere most owners should not go. The horn contacts live under the pad in the… middle of the steering wheel — directly on top of the driver's airbag module — and complaints describe the horn going off when the wheel is turned, when the truck hits a bump, and most often on cold mornings with the vehicle parked and switched off. One owner's account explains the mechanism: the covering over the module contracts in the cold and squeezes the horn contacts underneath it. Another had a mechanic replace the horn relay three times without curing it, which is worth knowing before you assume the cheap fix will hold. Owners report living with it by pulling the horn fuse, which trades one problem for another. Whether a vehicle whose horn does not work passes inspection depends on where you are — Costa Rica's RTV, a British MOT and a US state inspection each set their own rules — so check locally rather than assuming. What does not vary is that the pad in the middle of that wheel is a live restraint device: this repair belongs to a qualified mechanic.
Interior and trimWorks worse
- Problem
A Montero that squats when it is loaded is usually not broken — it is carrying more than the springs in it were chosen for. The spring supplier for… this generation classifies its rear springs by load-carrying capacity as well as by ride height, and warns that even a difference in factory trim changes which spring suits a given truck, which tells you how sensitive the rear end is to what you have added. Every permanent accessory counts: a steel bumper, a winch, skid plates, a second battery, a drawer system, a full water tank. Before you buy springs, check the rubber pads the springs sit on. The same supplier says the lower rear pads take more abuse than any other bushing or pad on the truck, that by this point in a third generation's life the originals are likely worn all the way through, and that the result is the coil sitting directly on the rear control arm — metal on metal, a rougher ride and a lot of noise. A crushed pad makes a healthy spring look tired, and it is the cheapest thing on the list.
SuspensionWorks worse
- Part
The thermostat for the later Gen 3 trucks with the larger petrol V6. It is not the same part as the one fitted to the earlier trucks and it does not… open at the same temperature, so the two are not interchangeable however similar they look on a counter. The catalogue page cited below also names two older Mitsubishi numbers this one replaces; both belong to earlier trucks, neither has a page here yet, and the supersession chain on this page is therefore shorter than the real one. Fitting a wrong-temperature thermostat is not a dramatic failure — it is a truck that runs cool, never reaches its map, and quietly costs fuel. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Cooling1305A191
- Part
The current Genuine Mitsubishi thermostat for the earlier Gen 3 trucks with the smaller petrol V6, and the number that replaced the one this… catalogue lists as superseded — the chain is on this page. It matters which of the two Gen 3 thermostats you order: the earlier and later trucks use different parts that open at different temperatures, and the catalogue gives a figure for each, so match the part to your engine rather than to the word "Montero". The specialist selling it recommends genuine units only and is unusually emphatic about it. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Cooling1305A239
- Part
This page exists so that an old number found on a box, an invoice or a forum post resolves to something rather than to nothing. It is the superseded… thermostat number for the earlier Gen 3 trucks with the smaller petrol V6; the catalogue page cited below states plainly that the current part replaces it, and the supersession chain on this page points at the number to order today. Do not order this one — a counter that still has stock has old stock. The replacement claim comes from a single catalogue page and not from a Mitsubishi parts bulletin, which is worth knowing before you argue with a parts clerk about it.
CoolingMD351861
- Problem
Mitsubishi ran a safety recall on the V6 first-generation Montero because the throttle valve could ice up and stick, leaving the engine unable to… drop back to idle. The remedy was a heated adapter plate under the throttle body. Owner complaints filed with the same regulator over the following years describe the outcome the recall was meant to prevent — a throttle that stayed open, a truck that surged from a stop, and in one case a rollover. The campaign record is listed against the first V6 model year only, while the owner complaints cited here come from the two later ones, so treat the model-year boundary as the paperwork's, not the fault's. Because the recall is decades old and these trucks have changed hands many times, a truck in front of you today may never have had the remedy fitted, and nobody can tell by looking. Anything that keeps the throttle from closing on its own is a safety-critical fault: do not drive the truck until it is fixed, and have the work done by a qualified mechanic.
Fuel systemSafety-critical
- Glossary term
The joint at each end of the steering linkage. Play here is felt as slop at the wheel and shows as uneven tire wear; replacing one always means an… alignment afterwards.
Steering
- Glossary term
The toothed belt that keeps the camshafts in step with the crankshaft. Costa Rican parts shops sell it as the faja de distribución, and the shop… floor also says faja de tiempo. On an interference engine a broken belt bends valves, so it is replaced by time and distance, not by how it looks.
Engine
- Part
The timing belt for this generation's petrol V6. This is an interference engine: if the belt breaks or jumps teeth the valves and pistons meet, and… the job stops being a belt and becomes an engine. That is why it is replaced on a schedule rather than when it fails, and why it is replaced as a kit — the belt, the tensioner, both pulleys and the water pump come out together, so a new belt on tired parts buys nothing and pays for the same access twice. The timing-belt-service entry covers the whole job and the interval. Order the belt from a supplier who lists it for this exact engine; a belt that is a couple of teeth off is not a belt that fits. The number and the fitment come from a parts catalogue and an independent seller's fitment guide, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD358549
- Problem
The Montero specialist who assembles the OEM kit for this generation states it plainly: these are timing-belt-driven interference engines on a fixed… service interval, and after collision damage the most common reason they see a Montero reach a scrapyard is a blown engine from a timing failure. That makes an unknown belt history a real problem rather than a paperwork gap — on an interference engine the belt does not strand you, it ends the engine. The same source warns that cheap aftermarket kit parts fail early, and lists what should always be replaced together: the belt, the tensioner and its pulley, the idler pulley, and the water pump with its gaskets. If you have just bought a Gen 3 and there is no receipt for this job, treat it as due. On a truck that lives at the end of a bad road, the arithmetic is not close. The interval and the interference-engine claim both come from one specialist supplier's kit documentation, so this entry is filed at the weakest tier. Treat the recommendation as sound trade practice rather than as a factory specification, and confirm the interval for your own market's service schedule.
EngineDamages other parts
- Part
The hydraulic tensioner that holds the timing belt tight. It is the part that decides whether a good belt stays a good belt: when the tensioner leaks… down, the belt goes slack, and on an interference engine a belt that jumps teeth ends the engine rather than stranding you. Nobody who has the front of this engine apart should put the old tensioner back — the specialist who assembles the kit for this generation lists it with the belt, the idler and the water pump as things that come out together and go back together, and the access is the expensive half of the job. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD362861
- Glossary term
The roller chain that keeps the camshafts in step with the crankshaft on the engines that use one instead of a belt. A chain does not have a… replacement interval the way a belt does, which is often mistaken for a chain lasting forever: what wears is the chain itself, its tensioner, and above all the plastic-faced guides it runs against. A jumped chain on an interference engine does the same damage a snapped belt does. No problem entry uses this term yet — it is defined here for the third-generation coverage that will.
Engine
- Glossary term
The rubber that touches the road. In Costa Rica it is the llanta and the shops sell aros y llantas as two different things; in Spain and much of… South America the same object is the neumático. Load and speed ratings, age and condition are safety-critical — have a tire fitter or a qualified mechanic judge a tire you are unsure of.
Wheels and tires
- Glossary term
The cold inflation pressure the vehicle's own placard calls for, not the maximum written on the tire. It changes with load and with tire size, and it… is checked cold.
Wheels and tires
- Glossary term
The code molded on the sidewall — section width, aspect ratio, construction, rim diameter, then the load and speed ratings. Changing it changes… speedometer reading, gearing and clearance, so it is never a free swap on a four-wheel-drive vehicle.
Wheels and tires
- Glossary term
The wrench that measures how hard a fastener is being tightened. Every torque figure on this site comes from a cited source, and the wrench is what… makes such a figure mean anything.
Tools
- Glossary term
A steel bar that twists instead of a coil compressing, used for the front springing of several Montero generations. Its adjuster sets front ride… height. Winding that adjuster up to gain height is not a lift: it preloads the bar, changes the alignment and runs the suspension at the end of its travel, which is the work a lift kit is designed to do properly.
Suspension
- Problem
A bolt-on trailer hitch sold for this truck was recalled because the weld holding the receiver tube could break, letting a trailer separate from the… vehicle without warning. The recall was raised by the hitch maker, not by Mitsubishi, so it is filed under the vehicle in the federal database rather than in any Mitsubishi service literature — which is precisely why an owner is unlikely ever to hear about it. The brand and part number of the recalled hitch are recorded in the source cited below. Two things follow. If your truck wears that hitch, it should not tow anything until it has been replaced. And on any thirty-five-year-old truck, whatever the brand, the hitch welds are worth a wire brush and five minutes before the first trip of the season. The truck itself is fine to drive; it is towing that is the hazard here. Towing equipment is safety-critical: have a qualified mechanic inspect and replace it.
BodySafety-critical
- Glossary term
The second transmission, behind the main one, that splits drive between front and rear axles and provides low range. It is the heart of what makes a… Montero a Montero, and its type — Easy Select or Super Select — decides which drive modes the vehicle has.
Transfer case
- Part
The switch that reads the two-wheel-drive / four-wheel-drive position. The transfer case on the Super Select II trucks carries one of these switches… for each shift position, and each position has its own part number — order by position, not by the words "transfer case switch", or you will fit a switch that reads the wrong shift. Each switch seals with its own crush washer, which is a separate part and is single-use. A failed switch is what puts the blinking four-wheel-drive light on the dash; before you buy one, pull the transfer-case trouble code and confirm which switch it names, because the switches all look identical and guessing which one failed is expensive. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR580152
- Part
The switch that reads high-range four-wheel drive. The transfer case on the Super Select II trucks carries one of these switches for each shift… position, and each position has its own part number — order by position, not by the words "transfer case switch", or you will fit a switch that reads the wrong shift. Each switch seals with its own crush washer, which is a separate part and is single-use. A failed switch is what puts the blinking four-wheel-drive light on the dash; before you buy one, pull the transfer-case trouble code and confirm which switch it names, because the switches all look identical and guessing which one failed is expensive. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR580153
- Part
The switch that reads low range with the centre differential locked. The transfer case on the Super Select II trucks carries one of these switches… for each shift position, and each position has its own part number — order by position, not by the words "transfer case switch", or you will fit a switch that reads the wrong shift. Each switch seals with its own crush washer, which is a separate part and is single-use. A failed switch is what puts the blinking four-wheel-drive light on the dash; before you buy one, pull the transfer-case trouble code and confirm which switch it names, because the switches all look identical and guessing which one failed is expensive. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR580155
- Part
The switch that reads the centre differential lock. The transfer case on the Super Select II trucks carries one of these switches for each shift… position, and each position has its own part number — order by position, not by the words "transfer case switch", or you will fit a switch that reads the wrong shift. Each switch seals with its own crush washer, which is a separate part and is single-use. A failed switch is what puts the blinking four-wheel-drive light on the dash; before you buy one, pull the transfer-case trouble code and confirm which switch it names, because the switches all look identical and guessing which one failed is expensive. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR580154
- Part
The switch that tells the truck it is in two-wheel drive. The transfer case on the Super Select II trucks carries one of these switches for each… shift position, and each position has its own part number — order by position, not by the words "transfer case switch", or you will fit a switch that reads the wrong shift. Each switch seals with its own crush washer, which is a separate part and is single-use. A failed switch is what puts the blinking four-wheel-drive light on the dash; before you buy one, pull the transfer-case trouble code and confirm which switch it names, because the switches all look identical and guessing which one failed is expensive. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMR580151
- Part
The sealing washer that goes under a transfer case position switch. There is one under each of the switches, which is where the quantity above comes… from, and it is a crush washer: it seals by deforming once, so a reused one is a slow gear-oil leak down the side of the case. It costs almost nothing, and the labour to go back for it costs the same as the first trip. While a switch is out, take the detent ball below it out too, clean it and its cavity, and put the new washer on with the new switch. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transfer caseMU000393
- Part
The upper rubber bushing in the transmission crossmember, and the truck takes the quantity shown above. There is also a lower bushing in the same… crossmember with a different Mitsubishi number, which does not have a page here yet — order both, because the crossmember is either apart or it is not. The seller's description is the useful bit: these dry out and shrink, the transmission sags, and the symptom people notice is a hard jolt going from park into reverse or drive. They come out and go in by hand, no press needed, and the crossmember has to come off anyway to drop the transmission pan, so this is the classic thing to add to a fluid and filter service. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
Transmission2910A065
- Part
The one-time-use sealing washer under the transmission pan drain plug. The catalogue is specific about this on the Gen 3: this washer is the… transmission drain plug's, not the engine's — the engine sump takes a different number — so do not let a counter hand you "the drain washer" and assume it is the right one. It seals by crushing, so it seals properly once. Reusing it is how a clean transmission service turns into a slow drip on the driveway a week later, and it is the cheapest part in the whole job. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
TransmissionMD050317
- Glossary term
The exhaust-driven compressor fitted to the turbodiesel engines in the range, from the first-generation 4D56T onward. Oil supply and cool-down… matter: shutting a hot turbo engine off immediately after a hard climb is how bearings get cooked.
Engine
- Problem
The fourth-generation diesel uses a variable-vane turbocharger, and the vanes that make it flexible are also what soot sticks to. The cited source… names the causes as oil-related — long oil change intervals, the wrong oil specification, and not letting the engine warm up or cool down — and separates two outcomes: a vane mechanism that has gummed up, which can sometimes be cleaned if it is caught early, and a turbocharger whose bearings have failed, which cannot. This is a single source, so the tier is the site's weakest, but the ordering it implies is sound and cheap to follow. Before either of those, eliminate a boost leak: a split intercooler hose or a loose clamp gives the same flat, smoky, comes-and-goes performance for the price of a clamp. If the turbo is passing oil, it is feeding the intake, and continuing to drive it hard risks the engine running on its own oil — which is why this is not filed as drive-normally.
EngineDamages other parts
- Glossary term
The indicator lamps. Costa Rican truck-parts catalogs list them as pide vías, also written pidevías; Spain says luces intermitentes, which in Costa… Rica means the hazard lights instead. A signal that suddenly flashes fast is usually a burnt bulb on that side.
Electrical system
- Glossary term
The cross-shaped joint at each end of a driveshaft. A dry or notchy one clunks on take-up and, left alone, can let the shaft loose — which is why it… is checked whenever the vehicle is on stands.
Drivetrain
- Part
The updated bolt that holds the crankshaft pulley on, sold as a set with its matching washer. The original bolt on these V6s is a known failure: the… specialist describes it backing out and breaking, which ruins the crankshaft and can take other parts with it — see the crankshaft-bolt-failure entry for the symptoms and the do-not-drive warning. The updated bolt is the fix, and the specialist states it comes with permanent thread locker already applied and includes the replacement washer, so fit both together and do not reuse the old washer. This page is filed under the updated bolt's number; the washer is part of the same set, and the parts counter can supply it by the kit. The number and the fitment come from a Montero specialist's catalogue and an independent parts catalogue, cited below — good evidence for what a part number is and what it fits, and not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification. Torque this bolt to the factory specification; do not guess it, and if you cannot, hand the job to a qualified mechanic.
Engine1100A141
- Part
The gasket under each rocker cover. One part number covers both banks, and the truck takes the quantity shown above — order the pair even if only one… side is weeping, because the second one is the same age and the covers are already off for a spark plug change. The specialist who sells it is blunt about the aftermarket versions: most are not sized correctly and rarely seal. Two warnings worth carrying to the bench: the cover bolts take a very light torque, so look the figure up in the service manual and use a torque wrench, because overtightening bows the cover and no gasket will seal it afterwards; and the spark plug tube seals live under the same cover and are a separate part. The number, the fitment and the count come from the Montero specialist's own catalogue page, cited below — a parts catalogue is good evidence for what a part number is and what it fits, and it is not factory literature, so read every figure on this page as the catalogue's claim rather than as a service-manual specification.
EngineMD303148
- Problem
This one belongs to the larger petrol V6 fitted to the later trucks, and the specialist supplier states the mileage at which it starts — the figure… is in the citation below rather than in this paragraph, so it is written down once. The failure is mechanical: the butterfly rod bushings wear, the rod leaks air, and the screws, bushings and butterfly valves in the surge tank can end up in the combustion chambers. Enthusiasts have a nickname for it that tells you the stakes better than any severity rating. This entry is deliberately scoped to a truck that is already telling you something — a rattle, an unsteady idle, rough running — rather than to mileage alone; high mileage on its own is a reason to inspect, not a reason to stop driving. Once it does rattle, the hardware is loose upstream of open valves, and that is the point at which the truck should stay parked. The choices are to rebuild the assembly, to remove it entirely and blank the rod port, or to buy a replacement surge tank, and the supplier is honest that deleting it costs a noticeable amount of torque.
EngineDamages other parts
- Glossary term
A lamp in the instrument cluster reporting a system. Two rules: a light that comes on while driving is read before the next trip, and a light nobody… can explain is not fixed by removing the bulb.
Interior and trim
- Glossary term
The housing on the head or block where the top hose and the thermostat live. Costa Rican catalogs list it as the toma de agua; its gasket weeps long… before it bursts.
Cooling
- Glossary term
The pump that circulates coolant. On engines where it is driven by the timing belt it is replaced with the belt, because the labour is already paid… for.
Cooling
- Glossary term
Rim and tire together, as one assembly — what comes off the vehicle when its wheel nuts are undone.
Wheels and tires
- Glossary term
Setting the angles the wheels sit at — toe, camber, caster. A vehicle that wanders, eats the inner or outer edge of a tire, or pulls to one side is… asking for alignment, and on a four-wheel-drive vehicle it has to be measured, not eyeballed. Costa Rican shops advertise the job as alineamiento, balanceo y tramado, and also as alineado y balanceado.
Suspension
- Glossary term
The metal part the tire is mounted on, steel or alloy. Costa Rican shops sell it as the aro and quote its diameter in inches; Mexico and Colombia say… rin, and in Spain and Argentina the same metal part is called llanta — which in Costa Rica means the tire instead, so the word has to be read by country.
Wheels and tires
- Glossary term
The recovery winch, usually mounted in or behind the front bumper. A loaded winch line is one of the most dangerous things on a vehicle: rated… shackles, a damper over the line and nobody standing in line with it.
Body
- Glossary term
The front glass — windscreen in British and Australian usage — which is a structural part on a modern body and part of how the passenger airbag… works. Chips spread fast on Costa Rican gravel roads, and a crack in the driver's field of view is a fail item at Costa Rica's RTV and at the UK MOT alike.
Body
- Glossary term
The hand tool that grips a nut or bolt head by its flats — open-ended, box-end or combination. Costa Rican catalogs list llaves combinadas, llaves… corofijas and llaves allen.
Tools
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