Standard Clearance:
- Top compression ring: 0.05-0.09mm
- Second compression ring: 0.05-0.09mm
- Oil scraper ring: 0.03-0.07 mm
Limit clearance:
- Top compression ring: 0.1mm
- Second compression ring: 0.1mm
The clearance in the upper compression ring is measured as follows. The outer surfaces of the ring and piston are aligned, the ring rises and the gap under the ring is measured.
If the clearance is greater than normal, replace the piston rings.
If the clearance is greater than normal when re-measured, replace the piston.