Parts for your 1990 Mitsubishi Pajero-Oil seals

1990 Mitsubishi Pajero Oil Seals — What They Do and When to Replace

Oil seals are absolutely relevant and fitted to the 1990 Mitsubishi Pajero. Factory documentation for the 1989–1991 Pajero/Montero (Mitsubishi Motors Factory Service Manual) and the Mitsubishi ASA Electronic Parts Catalogue list front and rear crankshaft seals, camshaft seals, transmission and transfer case input/output shaft seals, and differential/axle seals. Industry seal catalogues from NOK, Timken/CR and SKF also publish part numbers for these locations. So any 1990 Pajero—whether 4D56 diesel or 6G72 V6, manual or auto—relies on multiple oil seals to keep fluids in and grit out.

An oil seal’s job is to maintain lubrication while preventing leaks and contamination at rotating shafts. In this Pajero that means keeping engine oil inside the timing cover and rear housing, holding ATF or gear oil inside the gearbox and transfer, and protecting diff bearings out on the axles. Good seals reduce wear, hold pressure, and help the old wagon stay tidy under the bonnet and on the driveway.

Because seals harden with heat, age and dust, they’re a service item that should be checked whenever the area is open—think timing belt service, clutch replacement, or diff work. A small weep can quickly turn into a messy leak that oils the timing belt or clutch, so replacing a tired seal while access is easy is smart, low-cost insurance.

• Common Pajero oil seals and tell-tales:
  • Front crank and cam seals: misting behind the timing cover, oil on the timing belt.
  • Rear main seal: oil at the bellhousing, clutch slip on manuals.
  • Gearbox/transfer output seals: wet tailshaft flanges, spots along the underbody.
  • Diff pinion and axle seals: oil on backing plates or at the pinion yoke.
• Service tips:
  • Inspect seals at timing belt and clutch intervals