Crankcase Cover Gasket O-Ring for S-36/75AX - OS27414020 by O.S. Engine  [OS27414020]

Cover Plate Gasket Seal for RC Engines

The OS27414020 O-ring from O.S. Engine functions as the cover plate gasket for S-36 and 75AX style crankcases, acting as a straightforward replacement seal to help maintain a closed internal environment. It helps retain proper internal conditions during standard model use.

To install: remove the cover plate, clear all old gasket residue and oil from mating surfaces, place the O-ring into the groove, then reattach the cover using the manufacturer's specified torque sequence for the case fasteners. Avoid pinching or twisting the ring and check the groove for burrs or trapped debris that could impair sealing.

A properly installed cover plate O-ring supports consistent compression and reduces the risk of air leaks that can upset idle quality and throttle response. Replace the O-ring during any cover plate service, after extended use, or if the part shows signs of hardening or damage.