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

GF30 Drive Washer — For O.S. Engine Crankshafts

The O.S. Engine Drive Washer GF30 (OS4A008000) is intended as an axial positioning washer for O.S. nitro engine crankshaft assemblies. Its small form belies its role in ensuring the propeller or coupling seats at the intended axial location on the shaft.

When servicing the crank the washer interfaces with the crank and adjacent hardware to maintain repeatable axial spacing and limit lateral movement that can compromise driveline alignment or create vibration in model engines.

To fit the part, place the washer in the correct sequence on the crankshaft during reassembly, check that it sits flush against nearby components, and confirm free rotation prior to final assembly. Always confirm model OS4A008000 and check crankshaft dimensions when sourcing replacements rather than assuming universal fitment.

Fit the OS4A008000 washer when maintaining O.S. engine crankshafts to preserve axial spacing and steady drive alignment; verify the part number and shaft compatibility when ordering replacements.