Parts for your 1990 Mitsubishi Pajero-Oil pump

1990 Mitsubishi Pajero oil pump — purpose and service advice

Technical sources confirm the 1990 Mitsubishi Pajero is fitted with an engine oil pump. Factory service manuals for the Pajero/Montero (Engine Overhaul – Lubrication) covering the 4D56 2.5 diesel, 4G54 2.6 petrol, and 6G72 3.0 V6 specify a crankshaft-driven internal oil pump. Mitsubishi’s ASA/CAPS parts catalogues list complete oil pump/front case assemblies and service parts for these engines, and the Haynes/Max Ellery manuals also describe oil pressure checks and oil pump service for the same models. So yes—this Pajero definitely uses an oil pump.

The oil pump’s job is simple but critical: it pulls oil from the sump, pressurises it, and feeds the crankshaft and cam bearings, lifters, timing components and, on turbo models, the turbocharger. On the 4D56 and 6G72 it’s a trochoid (rotor-style) pump integrated into the front cover and driven off the crankshaft. Keeping pressure up means reduced wear, better cooling of hot spots, quieter running, and much longer engine life—especially important for Aussie and Kiwi conditions with long stretches, towing and dusty tracks.

It’s not a routine replacement item, but it does rely on clean oil, the right viscosity and a clear pickup screen. As part of regular servicing, change oil and filter on time, use a quality anti-drainback filter, and keep an eye on any oil warning light flicker at hot idle. If oil pressure seems low, verify with a mechanical gauge before blaming the pump