A gasket is a controlled leak path that has to seal three different things at once: combustion pressure, coolant, and oil. The material is chosen for which of those dominates.
Fibre, rubber, flexible graphite or aramid blends. Used for water pumps, fuel pumps, sumps, rocker covers. They conform to imperfect surfaces and tolerate small distortion.
They do not tolerate over-torque. Squash a soft gasket too far and it stops recovering, then it weeps.
Multi-layer steel with embossed sealing beads is standard where combustion pressure is high. It needs a flat, correctly finished deck — the bead has very little tolerance for a low spot.
Composite gaskets with a steel core and soft facing are more forgiving of surface finish but carry less peak pressure.
A failure between two cylinders means the head or block was not flat, or the bolts were not replaced. A failure to a water passage at one end often means the cooling system was pressurising from a blocked breather or a warped head.
Replace the gasket, but measure head flatness, bolt stretch and liner protrusion first. Otherwise the new one fails the same way.
Send your model, engine code or OEM number. We confirm fitment in writing before you pay; the first order on the Mongolia line ships free up to 30 kg — one time only.
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