Parts for your 2002 Mitsubishi Pajero-Head gasket

2002 Mitsubishi Pajero head gasket — what it does and how to look after it

A head gasket is absolutely fitted and relevant on the 2002 Mitsubishi Pajero. Both common engines for this model year—the 3.5L 6G74 V6 petrol and the 3.2L 4M41 turbo‑diesel—use a multi‑layer steel cylinder head gasket. This is documented in the Mitsubishi Pajero NM/NP Workshop Manual (2000–2006) and the Mitsubishi ASA parts catalogue, which list the cylinder head gasket as a service part and provide tightening sequences and torque‑angle procedures for the cylinder head bolts on these engines. Those factory sources also detail inspection, flatness, and replacement criteria for the head, gasket, and fasteners.

On a 2002 Pajero, the head gasket seals three critical things under the bonnet: combustion pressure in the cylinders, engine oil galleries, and coolant passages between the block and the cylinder head. It keeps compression high where it belongs, and stops oil and coolant mixing. When it’s doing its job, the engine runs sweet, makes proper power, and keeps temps in check.

Most head gasket dramas start with overheating, detonation, or uneven clamping from reused or incorrectly torqued bolts. Servicing that protects the gasket is simple: keep the cooling system healthy, use quality coolant at the right mix, ensure the radiator and viscous fan/thermostat are up to scratch, and don’t ignore small leaks. If the Pajero tows, works hard off‑road, or clocks big kilometres, it’s worth pressure‑testing the system and checking for early warning signs during routine services.

• Watch for unexplained coolant loss, white exhaust on start‑up, pressurised hoses when cold, or milky oil.
• Poor heater performance or bubbling in the overflow bottle can hint at combustion gases in the coolant.
• Misfires on cold start or sweet smells from the exhaust can also be giveaways.

When replacement is on the cards, plan on new head bolts (these are torque‑to‑yield on both 6G74 and 4M41), a quality MLS gasket matched to the engine’s spec, and a machine‑shop check of head flatness. Follow the factory torque‑angle sequence to the letter. For the diesel, gasket thickness selection is specified in the workshop manual and must match measured protrusion/marking—don’t guess it. It’s smart to clean and check the intake, EGR passages, injectors/plugs, and cooling system while you’re in there. Do the job once, and this gasket will happily go the distance across Aussie and Kiwi roads and tracks.

Q: What are the first signs of a failing head gasket on a 2002 Pajero?

Common early clues include slow coolant loss without obvious leaks, a sweet smell from the exhaust, or a cooling system that pressurises quickly from cold. You might also notice rough running on first start, white vapour, or tan/milky residue under the oil cap. A cooling‑system chemical test for combustion gases is a quick way to confirm suspicion.

Q: Can it be driven with a minor head gasket leak?

It’s risky. Even a small leak can snowball into overheating, warped heads, and a bigger repair bill. If it must be moved, keep trips very short, monitor temperature closely, and avoid load. Best bet is to organise repair promptly and protect the engine.

Q: Do the head bolts need replacing on the 6G74 or 4M41?

Yes—both use torque‑to‑yield bolts. The workshop manual specifies new bolts and a strict torque‑angle procedure. Reusing old bolts can compromise clamping force and shorten the life of the new gasket.