R 21RX and 21XM Compatible Crankshaft Bearing OS23930000 for O.S. Engine  [OS23930000]

Bearing engineered for O.S. Engine crankshafts

This crankshaft ball bearing is an aftermarket replacement designed for use with O.S. Engine R 21RX and 21XM engine models named in the product title. It is intended to reduce rotating friction and maintain crank alignment during varied running conditions.

Fitment tips: examine the crankcase seating surfaces for damage or contaminants before installing, employ a suitable press or bearing installation tool to avoid distorting the race, and confirm free rotation and correct endplay once the bearing is in place. Replace the unit if you detect roughness, excessive play, or overheating during operation.

This bearing is supplied for engine maintenance and rebuilds where restoring original fit and crank stability is required to regain reliable performance.