Parts for your 1987 Mitsubishi Pajero-Oil seals

1987 Mitsubishi Pajero oil seals — what they do and when to replace them

Oil seals absolutely are used on the 1987 Mitsubishi Pajero. Factory references such as the Mitsubishi Pajero (1983–1991) Workshop/Service Manual and the Mitsubishi ASA/CAPS parts catalogues for the L040/V20 series specify seals throughout the vehicle: front and rear crankshaft seals, camshaft and balance shaft seals (for engines like the 4D56 and 4G54), gearbox and transfer case input/output shaft seals, plus differential pinion and axle/hub seals. With those technical sources in mind, oil seals are a core part of this Pajero’s engine, driveline and axles.

On a 1987 Pajero, oil seals do the quiet, essential work: they keep lubricants in, grit and water out, and help maintain pressure around rotating shafts. Whether it’s the 2.5 turbo-diesel 4D56, the 2.6 petrol 4G54, or period V6 variants, lip-type seals with a garter spring are fitted at key spots to protect bearings and gears. When they harden or wear a groove on the mating surface, leaks kick off — and that’s when it’s time to act.

Smart servicing treats oil seals as “replace while you’re there” items. Typical touchpoints include:

• Timing-belt jobs (4D56/4G54): front crank, cam and balance shaft seals are right there.
• Clutch replacement: rear main (crankshaft) seal is easy to access with the gearbox out.
• Driveline work: transfer case and gearbox output seals, diff pinion and axle seals.

Telltales of a failing seal include weeping behind the crank pulley, oil inside the timing cover, clutch slip from a rear main leak, gear oil smells from the transfer/gearbox, and oily residue around the diff nose or inside a rear drum. Left unchecked, low oil levels lead to bearing wear, noisy diffs and pricey repairs.

Good practice on a Pajero of this era is straightforward: use quality seals (NBR or Viton where heat is higher), lightly oil the lip on install, and drive the seal square with the correct driver. If the shaft has a wear groove, consider a sleeve. Keep breathers clear on the rocker cover, gearbox, transfer and diffs — blocked breathers build pressure and force oil past otherwise healthy seals. After any seal work, recheck levels after a few short drives and look under the bonnet and underbody for fresh traces. Given the kilometres most classics have now clocked, bundling seal replacement into scheduled jobs saves time and avoids repeat labour. That way the old Paj keeps its fluids where they belong and stays ready for the next beach run or high-country track.

Where are the common oil seals on a 1987 Pajero?

They’re at the front and rear of the crankshaft, the camshaft and balance shafts (on engines so equipped), plus gearbox and transfer case input/output shafts. Out back, look for differential pinion and axle/hub seals. Each plays a role in keeping engine oil, gear oil and diff oil from sneaking out — and dust and water from sneaking in.

When should Pajero oil seals be replaced?

Replace when there’s visible weep or drip, when doing related jobs (timing belt, clutch, axle or gearbox work), or after a breather blockage has been fixed. On high‑kilometre vehicles, proactive replacement during major services avoids repeat labour and helps protect bearings and clutches.

What causes early oil‑seal failure on these?

Age hardening, heat, dusty or muddy use, shaft wear grooves, and blocked breathers are the big culprits. Incorrect fluid types and rough installation can also nick lips or mis-seat the seal, leading to quick leaks. Keeping vents clear and using quality parts goes a long way.