O.S. Engine OS28214000 Cover Gasket for S42 and GT22 Engines  [OS28214000]

S42 and GT22 Cover Gasket — Installation Guide

This O.S. Engine cover gasket is supplied as part number OS28214000 and is intended for use on S42 and GT22 engine covers. It provides the sealing interface between the cover and crankcase to protect compression and prevent fuel leakage during operation and maintenance.

Installation is aimed at the hobbyist workshop: remove old gasket remnants, ensure surfaces are clean, line up the OS28214000 with the ports, then reinstall the cover screws using the engine manual's tightening order and torque recommendations. Check for any distortion and do not overtighten fasteners to avoid squeezing the gasket out of position.

Consistent sealing from a correct gasket helps preserve engine performance during tuning and running. If you find leakage, oil around the joint, or a noticeable compression drop during bench testing, replace the gasket and verify engine settings before making carburetor adjustments.