Parts for your 1997 Mitsubishi Pajero-Oil pump

1997 Mitsubishi Pajero Oil Pump — What It Does and How to Look After It

An oil pump is absolutely fitted to the 1997 Mitsubishi Pajero. Technical sources including the Mitsubishi Motors Factory Service Manual for the 1997 Pajero/Montero (Engine Lubrication sections for 6G72/6G74 V6 and 4M40 diesel), the 4M40 Engine Workshop Manual, and the Mitsubishi ASA/FAST electronic parts catalogue all list and illustrate a crankshaft-driven trochoid/gerotor oil pump with an integrated pressure relief valve for these engines. General repair guides for 1990s Pajero/Montero models also cover oil pump inspection and replacement procedures, confirming its relevance on this vehicle.

On this Paj, the oil pump’s job is to move engine oil under pressure through galleries to the crankshaft and cam bearings, lifters, and (on diesels) the turbocharger. It keeps a stable film of oil between moving parts, carrying away heat and crud so the engine can rack up the kilometres without drama. The V6 pumps (6G72/6G74) are built into the front cover and driven directly off the crank, while the 4M40 diesel uses a similar trochoid design in the front case with a pick-up strainer in the sump.

It’s not a routine “replace every X km” service item. Most owners only touch it if there’s low oil pressure, excessive internal wear measured during a rebuild, or if they’re already in there for front cover/timing work. That said, a bit of smart maintenance goes a long way.

• Stick to the oil grade and change intervals in the owner’s manual, adjusting for Aussie/Kiwi heat, towing, and off-road use.
• At major services under the bonnet (timing belt jobs on the V6, front cover work on the 4M40), inspect the pump body and gears, the relief valve, and the pick-up strainer. Replace tired seals and O-rings, especially the front crank seal.
• If chasing a flickering oil light at hot idle, verify with a mechanical gauge before blaming the pump. Senders, thin oil, or bearing wear can mimic pump issues.
• When replacing, use quality parts and sealants, follow torque specs from the factory manual, and always prime the pump. Fill the filter, pack the pump with assembly lube, and crank with ignition disabled to build pressure before first start.

Common red flags include a persistent low-pressure warning, rattly top-end lifter tick, bearing rumble, or metallic glitter in the oil. If those show up, it’s time for a proper diagnosis and, if needed, an oil pump replacement while the front end is apart. Done right, the Pajero’s pump will deliver heaps of reliable service on and off the beaten track.

Does a 1997 Mitsubishi Pajero have an oil pump and where is it?

Yes. Every 1997 Pajero engine variant (V6 6G72/6G74 and 2.8L 4M40 diesel) uses a crank-driven trochoid/gerotor oil pump inside the front cover. It sits behind the harmonic balancer at the nose of the crankshaft, drawing oil from the sump pick-up and sending it through the engine’s galleries.

When should the oil pump be replaced on a 1997 Pajero?

There’s no fixed interval. Replace it if verified oil pressure is low, the relief valve is sticking, clearances are out of spec during a rebuild, or when you already have the front cover off (timing belt service on the V6, major front-end work on the 4M40). Always confirm pressure with a gauge before committing.

How do you prime a new or serviced oil pump on a Pajero?

Pack the pump with assembly lube, fill the new oil filter, and prefill the galleries where practical. Disable ignition or fuel and crank until the gauge shows pressure or the light goes out, then start and hold a fast idle while watching pressure. This avoids a dry start and protects bearings and lifters.