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

GF30 Axial Spacer for O.S. Engine Crankshafts

The O.S. Engine Drive Washer GF30 (OS4A008000) serves as a compact axial spacer for O.S. nitro engine crankshaft assemblies. It performs the important role of keeping the propeller or coupling seated at the correct axial position on the shaft.

When overhauling the crankshaft this washer interfaces with the shaft and nearby hardware to maintain constant axial clearance and reduce side play that can disturb alignment and increase vibration in model applications.

Assembly is direct: fit the washer in the proper order during reassembly, make sure it sits flush with adjacent parts, and hand-rotate the crank to confirm smooth operation before completing the build. Match the OS4A008000 model number and verify shaft geometry when sourcing replacements instead of assuming a universal fit.

Select the OS4A008000 washer when maintaining O.S. engine crankshafts to help preserve axial spacing and steady drive alignment; always confirm the model and fit before ordering.