Parts for your 1989 Mitsubishi Pajero-Oil seals

1989 Mitsubishi Pajero oil seals: what they do and when to replace them

Oil seals absolutely are used throughout a 1989 Mitsubishi Pajero. Technical sources including the Mitsubishi Pajero/Montero Factory Service Manual (1988–1991 editions, Engine, Transmission, Transfer, and Axle sections), the Mitsubishi ASA electronic parts catalogue for the L040-series Pajero, and general repair texts such as the Haynes Mitsubishi Pajero 1983–1996 manual all specify multiple oil seals for this model at the engine, gearboxes, transfer case and axles. They’re core to keeping lubricants in and contamination out across the driveline.

On this classic 4x4, oil seals are the quiet achievers—holding engine oil, gearbox and transfer fluids where they belong whilst keeping dust, water and mud at bay. That’s especially important for a Pajero that sees corrugations, creek crossings and long, hot highway stints. Healthy seals protect bearings and gears, stabilise oil pressure, and help keep the clutch and timing gear clean.

Where they’re found on a 1989 Pajero typically includes:

• Engine: front and rear crankshaft seals, camshaft seals on petrol engines, balance shaft seals on specific diesels.
• Transmission and transfer: input/output shaft seals, selector seals.
• Axles and diffs: front and rear axle shaft seals, hub/knuckle grease seals, differential pinion seals.
• Steering and ancillary drives: power steering pump/box seals and front cover seals.

As part of regular servicing, it’s smart to give the underside a quick look every 10,000–15,000 km: any fresh weep, sling on the tailshaft, or an oily mist near the harmonic balancer or bellhousing is a sign a seal’s on the way out. Burning-oil smells after a run, damp backing plates at the hubs, or drops on the driveway also point to trouble. Check breathers on diffs and the transfer case—blocked breathers can build pressure and force seals to leak even if they’re new.

Replacement tips that make life easier: use quality OEM or equivalent seals, lightly lube the lip with clean oil, and drive them square with the correct installer. Inspect the shaft surface, if it’s grooved, consider a sleeve. Clean mating faces, confirm orientation of directional lips, and torque fasteners to spec from the factory manual. It’s good practice to renew related seals proactively when the area’s already open—rear main at clutch time, cam and front crank seals at a timing belt service, and pinion/axle seals during diff or hub work. After any seal job, refill with the correct grade, reset oil levels, and recheck for weeps after the first few hundred kilometres.

Popular questions about 1989 Mitsubishi Pajero oil seals

Which oil seals most commonly leak on a 1989 Pajero?
Owners most often see issues at the rear main (oil at the bellhousing), the front crank seal (oily crank pulley/harmonic balancer area), camshaft seals on petrol models (oil inside the timing cover), and differential pinion or axle seals (wet diff nose or backing plates). High kilometres, heat, hard off-roading and blocked breathers tend to accelerate wear.

Should oil seals be replaced during a timing belt or clutch job?
Yes, it’s sensible. With the timing cover off, cam and front crank seals are relatively easy to renew and help keep the fresh belt clean. During a clutch replacement, the gearbox is already out, so a new rear main seal and input shaft seal can save doing the job twice.

Can the Pajero be driven with a minor oil seal leak?
Short term, a slight weep might be manageable if fluid levels are monitored closely, but it’s risky. Leaks can worsen without warning, contaminate a clutch or timing belt, and drop oil onto hot exhaust components. For a touring-ready Pajero, fixing leaks properly is the safer, cheaper move.