O.S. Engine OS4A008000 Drive Washer GF30 Crankshaft Spacer for O.S. Engines  [OS4A008000]

GF30 Crankshaft Drive Washer for O.S. Engine Models

The O.S. Engine Drive Washer GF30 (OS4A008000) is a compact crankshaft spacer made for O.S. nitro engine crankshaft assemblies. As a simple but essential crankshaft component, it sets and preserves the axial position where the propeller or drive coupling seats.

When rebuilding or servicing the crankshaft, this washer sits directly on the crankshaft and against adjacent hardware. Its role is to maintain consistent axial clearance and reduce lateral play that can upset driveline alignment or increase vibration in model engines.

Fitting is straightforward: place the washer in the correct order on the crankshaft during reassembly, ensure it seats flat against the neighboring parts, and verify free rotation before completing the assembly. For replacement parts, match the OS4A008000 model number and confirm crankshaft dimensions rather than assuming cross-brand interchangeability.

Use the OS4A008000 drive washer when servicing O.S. engine crankshafts to maintain axial spacing and consistent drive alignment; always confirm the part number before ordering replacements.