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

Precision GF30 Drive Washer for O.S. Engine Crankshafts

The O.S. Engine Drive Washer GF30 (OS4A008000) is designed as a dedicated spacer for O.S. nitro engine crankshaft assemblies. Though small, this washer performs the vital task of keeping the correct axial gap where the prop or coupling contacts the crankshaft.

During crankshaft rebuilds the washer interfaces directly with the crank and surrounding hardware. Its function is to preserve a repeatable axial position and limit lateral movement that could upset driveline alignment or create unwanted vibration in model engines.

Installation is simple: install the washer in the correct sequence on the crankshaft, confirm it seats evenly against adjoining parts, and check that the assembly rotates freely before finalising the build. For proper interchange, always confirm OS4A008000 and compare shaft geometry rather than presuming compatibility across brands.

When servicing O.S. engine crankshafts, use the OS4A008000 washer to preserve axial spacing and consistent alignment; always verify the part number and fitment before purchase.