1. Remove the piston oil cooling nozzle and check it as follows.
- Make sure the 1.7mm drill bit fits through the oil nozzle hole A (diameter 1.8 mm).
- Insert the other end of the 3.1mm drill bit into the oil inlet hole (diameter 3.2 mm). Make sure that the check valve ball B moves freely and has a stroke of approximately 2.0 mm.
- Check the operation of the piston oil cooling nozzle using compressed air. The pressure required should be about 200 kPa (1.2 2.0 kgf/cm²) to move the check valve ball from its place.
Note: Replace the piston oil cooling nozzle assembly if it is broken or bent.
2. Carefully install the piston oil cooling nozzle. Tightening torque is very important.
Tightening torque: 22 Nm.