O.S. Engine OS22631020 Ball Bearing for 12CV-R, 15CV-RX, 12TR, CZ-11PS  [OS22631020]

Replacement bearing for specified O.S. engines

This O.S. Engine ball bearing is an RC-scale replacement part intended for use with the listed engine models: 12CV-R, 15CV-RX, 12TR, and CZ-11PS. It serves as a direct wear item to restore smooth rotational support in the engine’s internal assemblies and is intended for routine maintenance or when a worn bearing shows play or roughness.

Compatibility is explicit to the model codes shown above; confirm the engine model stamping before installing. When replacing, work in a clean area, remove the engine head and crank assembly per the engine's service routine, and press the bearing in squarely to avoid race damage. Use appropriate bearing drivers or a press sized to the bearing outer race to prevent force through the balls or inner race.

Installation notes: avoid contaminating the bearing with grit or excess oil, inspect the crank for nicks before assembly, and check endplay and free rotation after installation. In tuning contexts the bearing itself does not change engine timing or performance directly, but restoring low-friction rotation ensures predictable response during throttle and idle adjustments.