O.S. Engine OS23730000 Crankshaft Ball Bearing R 21RZ.37SZ  [OS23730000]

Crankshaft ball bearing overview

This crankshaft ball bearing is offered as a direct replacement component for RC engine maintenance and rebuild tasks. It serves as the rotating support inside the crankcase where the crankshaft journals run, helping reduce friction and wear during engine operation.

Installation is typically performed during an engine rebuild or when diagnosing excessive play or rough rotation at the crankshaft. Proper fitment requires checking bearing seat cleanliness, shaft runout, and correct bearing orientation; press-fit or gentle tapping with a non-marring driver are common fitting methods used by hobbyists.

In tuning and setup, a smooth, correctly seated crankshaft bearing contributes to consistent engine idle and throttle response by ensuring stable crankshaft rotation. It does not change compression or timing directly but supports mechanical reliability that affects overall engine behavior.

Choose this bearing when a worn or noisy crankshaft support is identified during engine servicing to restore smooth rotation and extend the service life of the engine components.