O.S. Engine OS27414020 Cover Plate Gasket O-Ring for S-36 75AX RC Engine Crank Case Seal  [OS27414020]

Cover Plate O-Ring for RC Engines

This O-ring is an RC-scale cover plate gasket intended for the crank case area of S-36 and 75AX style model engines. It functions as a replacement seal to help maintain a closed crankcase and preserve the intended internal environment of the engine during normal model use.

Installation is straightforward for hobby technicians: remove the cover plate, clean mating surfaces of old gasket residue and oil, seat the O-ring into the cover groove, then reassemble with the manufacturer’s torque recommendations for case fasteners. Avoid pinching the ring during installation and inspect the groove for burrs or trapped debris that can compromise the seal.

In tuning and maintenance routines, a properly seated cover plate O-ring supports consistent compression and helps prevent air leaks that can affect idle stability and throttle response on RC model engines. Replace the O-ring whenever you remove the cover plate for repair, after prolonged service, or if there are signs of hardening or damage.