Parts for your 2001 Mitsubishi Pajero-Oil seals

2001 Mitsubishi Pajero oil seals — what they do and when to sort them

Oil seals are definitely used on the 2001 Mitsubishi Pajero. Rotary shaft lip seals are specified throughout the NM/NP-series Mitsubishi Motors Service Manual (engine, driveline, and axle sections), and they’re listed in the Mitsubishi ASA electronic parts catalogue for the 2000–2006 Pajero. Their function and locations also align with ISO 6194 standards for rotary shaft lip-type seals used on crankshafts, camshafts, pinions and outputs.

On a 2001 Pajero, oil seals keep fluids in and grit out wherever a rotating shaft exits a housing. Think engine crank and cams, gearbox and transfer outputs, diff pinions, and front axle stubs. In day-to-day terms, they stop the engine, gearbox, transfer case and diffs from weeping oil, and they protect bearings and clutches from contamination.

There’s no strict replacement interval for seals, they’re typically replaced on condition. That said, smart servicing bundles them with related jobs. On the V6 (6G74), it’s good practice to replace the front crank and cam seals during the timing belt service (about every 100,000 km). If the gearbox is out for a clutch, doing the rear main seal at the same time avoids paying labour twice. For the diesel (4M41), timing is chain-driven, but front and rear crank seals still get done if they show seepage. Diff pinion and axle seals are commonly replaced when bearings or universal joints are serviced.

Signs a seal is on the way out include oil dampness or drip at the crank pulley, oil mist under the timing cover, a weep from the bellhousing (rear main), wetness around transfer or tailshaft flanges, and diff oil thrown onto the underbody or brakes. A burning oil smell after a drive can hint at oil hitting the exhaust or headers.

When fitting replacements, use quality Viton/NBR seals to handle Aussie and Kiwi heat. Clean and inspect the shaft surface, if it’s grooved, consider a sleeve. Lightly oil the lip, press the seal in square, and torque flanges and nuts to spec from the Mitsubishi workshop manual. Don’t forget to check breathers on engine, diffs and transfer — blocked vents build pressure and can force fresh seals to leak. After the job, refill with the correct fluids and recheck levels after a short run.

• Common Pajero seal spots: front and rear crank, cam seals (V6), transfer case input/output, auto/manual output, diff pinion seals, and front axle/hub seals.

Popular questions

Where are the common oil seals that leak on a 2001 Mitsubishi Pajero?
Usual suspects are the rear main seal (drip from the bellhousing), front crank and cam seals on the V6 (oil around the timing cover), transfer case output seals (oil on the tailshaft), diff pinion seals (oil on the nose of the diff and crossmember), and front axle/hub seals (oil on the backing plates).

Do oil seals have a set service interval on a 2001 Pajero?
No fixed interval. Replace them when they seep or while you’re already in there for major work — timing belt on the V6, clutch or gearbox removal, axle or diff bearing service. It’s preventative and saves paying duplicate labour.

How much does a rear main seal job usually cost?
It’s labour-heavy because the gearbox needs to come out. Depending on transmission, workshop rates and what else is done at the same time, expect a ballpark of AUD/NZD 800–1,800. Combining it with a clutch on manuals often makes sense.