Parts for your 2003 Mitsubishi Pajero-Head gasket

2003 Mitsubishi Pajero head gasket — what it does and when to sort it

For a 2003 Mitsubishi Pajero, a head gasket is absolutely relevant and fitted from factory. Technical sources including the Mitsubishi NM/NP Pajero Workshop Manual (2000–2006, Engine—Cylinder Head section) and the Mitsubishi ASA electronic parts catalogue list dedicated cylinder head gasket part numbers for both the 3.2 Di‑D diesel (4M41) and the petrol V6s (6G74/6G75). Industry data services used by workshops in AU/NZ also specify head bolt torque/angle procedures for these engines, which only apply if a head gasket is present. So yes—this Pajero uses a multi‑layer steel (MLS) head gasket.

On this model, the head gasket seals three critical interfaces between the block and the alloy cylinder head: combustion pressure, engine oil galleries and coolant passages. The MLS design copes well with heat cycling and boost on the diesel, keeping compression crisp while stopping oil and coolant from mixing. When healthy, it helps the Pajero pull hard off‑road and cruise quietly on the highway without overheating dramas.

It isn’t a routine “service item”, but looking after it is about keeping the cooling system and tune in top nick. Regular coolant changes to the correct Mitsubishi spec, a good radiator cap, clean radiator and condenser fins, and a sound thermostat and fan clutch all reduce thermal stress that can warp a head. Avoid hard towing or sand work with a blocked radiator or low coolant—heat is the enemy here.

Typical red flags include unexplained coolant loss, overheating under load, white steam from the exhaust, pressurised hoses from cold, contaminated oil (milky), sweet smell from the exhaust, or a rough cold start on the diesel. If these pop up, stop driving and get it pressure‑tested—pushing on can turn a repair into a full rebuild.

If replacement is needed, it’s a proper workshop job. The head should be crack‑tested and measured for flatness