O.S. Engine OS44508000 Drive Washer FS-200S Crank Shaft Part  [OS44508000]

Drive washer for FS-200S

This drive washer is an RC-scale crank shaft component intended for use with the FS-200S engine family, supplied under the O.S. Engine model OS44508000 designation. It functions as a mating washer on the crankshaft end to locate the drive coupling and help maintain correct axial clearance during operation.

Installation is straightforward for hobby workshops: slide the washer onto the crankshaft flange so it seats against the crankcase face or adjoining spacer, confirm the drive coupling runs true, then check endplay with a feeler or by gently rocking the assembly. If play exceeds expected limits, recheck mating surfaces and any adjacent shims or spacers rather than increasing washer thickness without verification.

In tuning and maintenance contexts the washer's role is to stabilise the drive interface and limit unwanted axial movement that can affect gear engagement or coupling alignment. Regular inspection for wear or deformation is recommended when rebuilding or when diagnosing vibration or premature coupling wear in nitro RC engines.