Checking the clearance between piston grooves and piston rings:
1 - probes;
And - the wrong position of the probe;
B - the correct position of the probe
- The clearance for the top compression ring should be between 0.04 and 0.08 mm.
- The clearance for the lower compression ring should be between 0.025 and 0.07 mm.
- The clearance for the oil scraper ring should be in the range of 0.08 - 0.22 mm.
If the clearances are out of range, replace the piston with piston pin or piston rings.