Parts for your 1998 Mitsubishi Pajero-Manifold gasket

1998 Mitsubishi Pajero manifold-gasket — purpose, fitment and servicing

Technical sources confirm a manifold-gasket is absolutely used on the 1998 Mitsubishi Pajero. The Mitsubishi Pajero/Montero Workshop Manual (1991–1999, Engine Overhaul), the Mitsubishi ASA electronic parts catalogue for the V20-series Pajero, and general repair references like the Haynes Mitsubishi Montero/Pajero manual all list both intake manifold gaskets and exhaust manifold gaskets for the 4M40 2.8 diesel and the 6G72/6G74 V6 petrol engines. So the manifold-gasket is relevant to this vehicle.

On a 1998 Pajero, the manifold-gasket seals the join between the cylinder head and the manifold. There are two types in play: the intake manifold-gasket keeps unmetered air from sneaking into the engine, preserving stable idle, correct air–fuel ratios and smooth running. The exhaust manifold-gasket contains hot exhaust gases as they leave the head, protecting nearby components and helping the oxygen sensor and turbo (on 4M40) see consistent flow. Either way, the gasket’s job is to hold pressure and temperature without letting leaks form as metals expand, contract and vibrate under the bonnet.

Age, heat cycling and surface corrosion are the usual culprits when a gasket gives up. On the diesel 4M40, EGR soot and oil mist can cake around the intake ports, hardening the gasket and creating air leaks