Parts for your 1992 Mitsubishi Pajero-Sump plug washers

1992 Mitsubishi Pajero sump plug washers

Yes, the 1992 Mitsubishi Pajero is fitted with a sump plug washer, and it’s considered a service item. Technical sources specifying this include the Mitsubishi Pajero/Montero workshop manual for the V20 series (Lubrication section), which instructs refitting the drain plug with a new gasket and torquing it to around 39 N·m, as well as the Mitsubishi ASA electronic parts catalogue listing a gasket for the oil pan drain plug (commonly MD050317, superseded by 2825A006 on many applications). General repair guides such as Haynes and Ellery manuals for Pajero models from the era also advise replacing the washer at every oil change.

On a 1992 Pajero, the sump plug washer is a simple crush washer—usually copper or aluminium—that sits under the drain plug and seals the oil pan. When the plug is tightened, the soft metal deforms to fill microscopic gaps between the plug and the sump, preventing drips and weeps. It’s a tiny part, but it does the heavy lifting for oil-tight reliability.

Best practice for this model is to replace the washer at each oil change. Re-using an old, flattened washer can lead to slow leaks, a mess on the driveway, or a plug that needs over-tightening to seal—risking stripped threads in the pan. Most Pajero variants of this year use a 14 mm crush washer (M14 drain plug), with the above Mitsubishi part numbers widely referenced across diesel (4D56) and petrol (6G72) engines from the period.

When servicing the Pajero, clean the sump face, fit a new washer, and torque the plug to spec—about 39 N·m per the Mitsubishi manual. After topping up, run the engine, then check around the plug for any weeping. If there’s still a hint of oil, don’t just swing on a longer spanner, confirm the washer is the correct size and material, and that the mating face isn’t nicked. Copper and aluminium both work well, copper is slightly more forgiving and common on Mitsis from this era.

• Replace the washer at every oil change.
• Use the correct size (typically 14 mm for 1992 Pajero).
• Tighten to the factory torque, not “as tight as possible”.
• Keep a few spare washers in the glovebox for road trips.

Popular questions

What size sump plug washer does a 1992 Pajero use?
Most 1992 Pajeros use a 14 mm crush washer on the engine oil drain plug. Mitsubishi parts commonly referenced are MD050317 or its later supersession 2825A006. Always match to the engine variant and confirm by the plug size on the vehicle or via the parts catalogue.

How often should the washer be replaced?
Every oil change. The washer is designed to deform once to create a proper seal. Re-using it invites weeping and can tempt over-tightening. It’s a cheap part that prevents much pricier hassles.

Can a fibre or bonded washer be used instead of copper?
Copper or aluminium crush washers are the preferred choice for the 1992 Pajero. Some bonded (metal-and-rubber) types can work if sized correctly, but stick with the OEM-style metal crush washer for the most reliable seal and correct torque feel.