Piston Ring: Testing and Inspection

PISTON RING END GAP





- Insert bare ring into cylinder.
- Push down squarely on piston ring until it is approx. 15 mm from bottom edge of cylinder.

^ New:
1st Compression Ring: 0.20-0.40 mm (0.0078-0.0157 inch).
2nd Compression Ring: 0.20-0.40 mm (0.0078-0.0157 inch).
Oil Scraper Ring: 0.25-0.50 mm (0.0098-0.0197 inch).

^ Wear Limit:
1st Compression Ring: 1.00 mm (0.0390 inch).
2nd Compression Ring: 1.00 mm (0.0390 inch).
Oil Scraper Ring: 1.00 mm (0.0390 inch).


RING TO GROOVE CLEARANCE





- Clean piston ring groove before checking

^ New:
1st Compression Ring: 0.02-0.05 (0.0008-0.0020 inch).
2nd Compression Ring: 0.02-0.05 (0.0008-0.0020 inch).
Oil Scraper Ring: 0.02-0.05 (0.0008-0.0020 inch).

^ Wear Limit:
1st Compression Ring: 0.15 (0.0059 inch).
2nd Compression Ring: 0.15 (0.0059 inch).
Oil Scraper Ring: 0.15 (0.0059 inch).