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

Bearing replacement to restore low-friction rotation

This O.S. Engine ball bearing is a direct replacement for the engine model numbers shown: 12CV-R, 15CV-RX, 12TR, and CZ-11PS. It removes wear-related play and helps the crank turn freely to support precise throttle and idle adjustments.

Before fitting, confirm you have the correct engine model stamped on the case. Carry out the removal of the head and crank using the engine's service procedure, and drive or press the bearing using a tool that supports the outer race to avoid damaging internal ball elements or the inner race.

During installation, prevent contamination by working in a clean environment and avoid excess lubricants that attract grit. Check the crank journal for burrs, verify endplay and smooth rotation after assembly, and note that while the bearing does not change ignition or valve timing, reduced friction improves the engine's responsiveness.