Parts for your 2004 Mitsubishi Pajero-Head gasket

2004 Mitsubishi Pajero head gasket — purpose, care, and when to replace

Technical sources confirm the 2004 Mitsubishi Pajero uses a conventional cylinder head gasket across its engines (3.5‑litre 6G74 V6, 3.8‑litre 6G75 V6, and 3.2‑litre 4M41 DI‑D diesel). The Mitsubishi Pajero NM/NP Service Manual (Engine Overhaul sections), the Mitsubishi ASA Electronic Parts Catalogue, and common aftermarket catalogues (e.g., Victor Reinz, Ajusa, Permaseal) all list head gaskets and complete head set kits for these engines. So the head gasket is very much relevant to the 2004 Pajero.

On this model, the head gasket’s job is to seal combustion pressure and keep engine oil and coolant in their own passages under the cylinder head. Modern multi‑layer steel (MLS) designs, as specified for these engines, handle heat cycling and clamping loads well, provided cooling and torque specs are maintained. When healthy, the gasket helps the V6s and the DI‑D diesel run smoothly, efficiently, and without cross‑contamination.

• Common warning signs of trouble include unexplained coolant loss, overheating under load, white exhaust vapour on start‑up, milky oil, oily coolant, pressurised hoses after an overnight sit, rough cold starts, and sweet smells from the exhaust.
• A chemical block test or cylinder leak‑down can help confirm concerns before any strip‑down.

A head gasket isn’t a routine service item, it’s intended to last the life of the engine. Preventative care matters in Australian and New Zealand conditions: regular cooling system services at the recommended kilometre or time intervals, a clean radiator core (handy for those doing beach runs or outback touring), a sound thermostat, and a healthy viscous fan clutch or electric fan operation. Using a Mitsubishi‑approved long‑life coolant mixed to spec and maintaining correct radiator cap pressure helps keep gasket clamp loads stable and hot spots at bay.

If replacement is required, correct procedure is critical: follow the service manual’s torque‑angle sequence, check head flatness and surface finish, pressure‑test the head, and replace torque‑to‑yield head bolts. Quality MLS gaskets from reputable brands are strongly advised. For the petrol V6s, it’s common to bundle the job with a timing belt and water pump service while access is open. On the 3.2 DI‑D, technicians typically inspect timing chain guides and the cooling system while the top end is apart. Professional installation and post‑repair bleeding of the cooling system reduce the risk of repeat issues, especially for vehicles that tow or see steep alpine climbs.

Popular questions

Does a 2004 Pajero have a head gasket?
Yes. Factory manuals for the NM/NP series and the Mitsubishi ASA parts catalogue list head gaskets and head bolt sets for the 6G74, 6G75, and 4M41 engines, and major gasket suppliers offer head sets for this model year.

How long should the head gasket last in a 2004 Pajero?
With proper cooling system maintenance and no overheating events, many last the life of the engine. Heat stress, old coolant, or heavy towing with marginal cooling can shorten service life.

What does a head gasket replacement typically cost in Aus/NZ?
Pricing varies by engine and workshop. As a broad guide, parts and labour can land around AUD/NZD 2,000–5,000, influenced by machining needs, bolt and gasket quality, and whether timing components or water pump work is added on the V6s.