Parts for your 2005 Mitsubishi Pajero-Oil pump

2005 Mitsubishi Pajero oil pump — what it does and when to service it

The 2005 Mitsubishi Pajero definitely uses an oil pump. This is documented in Mitsubishi Motors’ workshop manuals for the Pajero/Montero NM–NS era (Engine Lubrication sections), the 4M41 3.2 Di‑D and 6G7x V6 engine service manuals, and the Mitsubishi ASA electronic parts catalogue, all of which list a crankshaft‑driven oil pump assembly for 2005 Pajero variants.

On this model, the oil pump is a gerotor/trochoid type integrated into the front timing case and driven directly off the crankshaft. Its job is to pull oil from the sump through the pickup, push it through the filter, and feed critical parts like crank and cam bearings, hydraulic lifters, and—on the 3.2 Di‑D—its turbocharger. It also regulates pressure via an internal relief valve so the engine gets steady lubrication across cold starts, high revs, towing, or long highway runs in Aussie and Kiwi conditions.

This pump isn’t a routine replacement item, it’s designed to last the life of the engine when serviced with the right oil and filter at the intervals in the owner’s manual. The single biggest “service” for the oil pump is simply keeping oil clean and at the correct viscosity for climate and load.

• When to investigate or replace: illuminated oil pressure light, persistent tappet/chain rattle after warm‑up, verified low pressure on a mechanical gauge, metal debris in the sump, or noticeable pump/cover scoring during front cover or timing work.
• Good practice during replacement: inspect and clean the pickup screen, renew front crank seal and relevant gaskets, check bearing clearances if pressure was low, prime the pump with assembly lube or oil, and confirm hot idle and cruise pressure with a gauge after reassembly.
• Preventive tips: use quality filters, avoid excess silicone sealant that can clog the pickup, stick to the specified oil grade, and shorten intervals if towing, working in dust, or doing short‑trip city cycles.

Access is behind the harmonic balancer and front cover, so it’s a moderate‑to‑major job on both the 4M41 diesel (timing chain front case) and the 6G74/6G75 V6. Special tools and correct sealing procedures matter, making it a task best left to a workshop if timing components are coming off anyway.

For Australian and New Zealand owners who tour, tow, or see big temperature swings, staying on top of oil quality and watching the oil pressure light will do more for pump health than any other single action.

Popular questions about 2005 Mitsubishi Pajero oil pumps

Does a 2005 Mitsubishi Pajero have an oil pump and where is it located?
Yes. Every 2005 Pajero engine variant (3.2 Di‑D 4M41 and the V6 petrols) runs a crank‑driven pump inside the front timing cover. It’s behind the crank pulley/harmonic balancer and integrated with the front case, drawing oil from the sump via a pickup.

When should the oil pump be replaced on a 2005 Pajero?
There’s no scheduled interval. Replace it if there’s verified low oil pressure, damage or scoring found during front cover/timing work, a sticking relief valve, or after severe sludge or bearing failure. Many owners choose to replace it proactively when the front cover is off at high kilometres.

How is the oil pump primed after replacement?
Pack the rotors with assembly lube or pre‑fill with clean engine oil, pre‑oil the galleries where possible, then crank with ignition/injection disabled until pressure registers. This avoids a dry start and helps the hydraulic tensioner and lifters charge quickly.