Note: If the piston is replaced with a new one, the piston rings must also be replaced with new ones.
Check the piston rings for damage, breaks or significant wear.
Check the clearance between the piston ring and the piston groove. If the clearance exceeds the maximum permissible value, replace the ring or the piston, or both.
Note: Before taking measurements, remove carbon deposits from all piston grooves. Measure the gap between the ring and the piston groove over the entire circumference of the ring.
Clearance between ring and piston groove
The original was published on the website www.mitsubishiman.ru
Nominal value:
- ring #1 - 0.06-0.11 mm;
- ring #2 - 0.05-0.08 mm;
- oil scraper ring - 0.02-0.07 mm.
Maximum permissible values:
- ring no. 1 - 0.15 mm;
- ring no. 2 - 0.15 mm;
- oil scraper ring - 0.10 mm.
Checking the gap in the ring lock
Install the piston ring into the cylinder. Using the piston as a pusher, push the ring down so that it is installed at a right angle to the cylinder walls. Measure the gap in the piston ring joint with a flat feeler gauge. If the gap in the joint exceeds the maximum permissible value, the ring must be replaced.
Nominal value:
- rings No.1 and No.2 - 0.30-0.45 mm;
- oil scraper ring - 0.25-0.45 mm.
Maximum permissible value: 0.8 mm.