Pic. 2.154. Checking the clearance between piston grooves and piston rings: 1 - probes; A - incorrect position of the probe; B - the correct position of the probe
Use a feeler gauge to check the clearances between the piston grooves and the piston rings (pic. 2.154).
The clearance for the upper compression ring should be between 0.04–0.08 mm.
The gap for the lower compression ring should be in the range of 0.025–0.07 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.