Parts for your 1998 Mitsubishi Pajero-Oil pump

1998 Mitsubishi Pajero oil-pump — what it does and how to look after it

Yes, a 1998 Mitsubishi Pajero absolutely uses an engine oil-pump. Mitsubishi’s factory Workshop Manuals for the 6G72/6G74 petrol V6 and 4M40 2.8‑litre turbo‑diesel engines (Lubrication System sections, late‑1990s editions), along with the Mitsubishi ASA electronic parts catalogue and common AU/NZ repair manuals (Haynes and Gregory’s), all describe a crankshaft‑driven, front‑mounted trochoid/gear‑type oil‑pump supplying pressurised oil to the bearings, valvetrain, and on diesel models, the turbocharger.

The oil-pump’s job on a 1998 Pajero is to pick up oil from the sump, pressurise it, and push it through galleries so the crank, cam gear, pistons, and lifters are kept happy. On the 4M40 turbo‑diesel, that pressure feed also keeps the turbo alive. It’s a simple bit of kit, usually integrated into the front cover and driven off the crank, but it’s the heart of the lubrication system—no pressure, no protection.

For everyday servicing, the smartest way to care for the oil-pump is to care for the oil. Sticking to the recommended oil grade for the climate and engine (for example, a quality 15W‑40 diesel oil for 4M40, or 10W‑30/10W‑40 for the V6s) and sensible intervals based on local conditions—often 5,000–10,000 kilometres—reduces sludge and abrasive wear that can score the pump’s rotors and cover plate. Fresh filters matter too, a clogged filter can force the bypass to open and let unfiltered oil circulate, which isn’t ideal for the pump or bearings.

Warning signs the oil-pump or lubrication system needs attention include a flickering oil lamp at idle when hot, noisy lifters on cold starts, rattly timing gear, turbo whine on the diesel, or a mechanical gauge reading below spec. Always confirm with a known‑good pressure gauge before condemning the pump—senders and wiring can mislead.

Replacement is typically considered during major front‑end engine work. On the V6, the pump lives behind the timing belt area, on the 4M40, it’s at the front of the block driven by the crank/gear train. Access usually means removing front covers and loosening the sump. When fitting a new or rebuilt pump, check end‑clearances per the manual, replace the front main seal and O‑rings, clean the pickup strainer, and prime the pump with clean oil or assembly lube. After reassembly, disable fuel/ignition and crank for oil pressure, then start and verify hot idle pressure. A quality genuine or reputable aftermarket pump and careful setup will see a Pajero happily clock heaps more kilometres.

• Never run the engine with the oil warning lamp on—shut it down and diagnose.
• If the front cover’s off for a timing belt (V6), it’s a good time to inspect the pump and relief valve.
• Keep an eye on leaks around the front seal, low oil level hurts pumps and bearings.

Popular questions

Does a 1998 Mitsubishi Pajero have an oil-pump, and where is it located?
Yes. All factory engines offered in 1998 Pajeros use a crank‑driven, front‑mounted oil-pump integrated with the front cover. On V6 models it sits behind the timing belt area, on the 4M40 diesel it’s driven at the front of the engine by the crank/gear train.

What are the signs the oil-pump on a 1998 Pajero needs attention?
Low or flickering oil pressure light at hot idle, top‑end ticking, brief rattle on cold start, or low readings on a mechanical gauge point to lubrication issues. Confirm pressure with a gauge, inspect the pickup for sludge, and rule out a faulty sender before replacing the pump.

Should the oil-pump be replaced during major service work?
During a timing belt service on V6 models, or an engine rebuild on any variant, it’s wise to inspect clearances, the relief valve, and the pump cover for scoring. Replace the pump if wear is out of spec, and always renew seals and gaskets while access is open.