O.S. Engine OS4A008000 Drive Washer GF30, crankshaft drive washer for O.S. engines  [OS4A008000]

Drive Washer GF30 for O.S. Engines

The O.S. Engine Drive Washer GF30 (OS4A008000) is a dedicated crankshaft drive washer intended for use with O.S. nitro engine crankshaft assemblies. As a small but functional crankshaft component, it helps establish and maintain axial spacing on the crankshaft where the propeller or drive coupling seats.

In practice this washer is used when rebuilding or servicing the crankshaft assembly; it interfaces directly with the crankshaft and associated drive hardware. Technically it serves to ensure consistent axial position and to reduce lateral play that can affect driveline alignment and vibration characteristics on model engines.

Installation is straightforward: during reassembly, place the washer on the crankshaft in the manufacturer‑specified order, confirm correct seating against adjacent components, and verify free rotation before final assembly. For parts interchange, rely on matching model numbers and crankshaft geometry rather than assuming cross‑brand fit.

Use this drive washer when servicing O.S. engine crankshafts to preserve axial spacing and help maintain stable drive alignment; confirm model number OS4A008000 when ordering replacements.