Piston Pin: Testing and Inspection

1. Check pistons and piston pins for damage, cracks, and wear and the piston ring grooves for wear and damage. Replace if defective.
2. Measure the piston-to-cylinder clearance at each cylinder. If any of the clearances is not to specification, replace the piston or bore the cylinder to use an oversize piston.








3. Make sure that piston pin can be inserted into the piston pin hole with a thumb at 20°C (68°F). Replace if defective.
Standard clearance between piston pin and hole in piston:
- Standard: 0.004 - 0.010 mm (0.0002 - 0.0004 inch)
- Limit: 0.020 mm (0.0008 inch)





4. Check circlip installation groove on the piston for burr. If necessary, remove burr from the groove so that piston pin can lightly move.
5. Check piston pin circlip for distortion, cracks and wear.