Fitting Rings
- Position rings squarely in cylinder bore at a point where bore diameter is smallest. Measure ring end gap with a feeler gauge. Replace rings if end gap is larger than .059" (1.5 mm). Using a feeler gauge, check ring side clearance. Replace pistons and rings if side clearance is greater than .006" (.15 mm).
- Install oil control rings as follows: Expander ring, lower side rail, then upper side rail. See Fig 1 . Position compression rings so that "N", "NPR", "T" or "TOP" mark is upward. Ensure rings turn freely in ring grooves. On all models except I-Mark, piston ring size may be identified using mark on rings.
PISTON RING IDENTIFICATION
| Application | Mark | |
|---|---|---|
| Standard | ||
| 1st Compression Ring | None | |
| 2nd Compression Ring | None | |
| Oil Control Ring | Red | |
| 0.5 mm Oversize | ||
| 1st Compression Ring | 50 | |
| 2nd Compression Ring | 100 | |
| Oil Control Ring | Blue | |
| 1.0 mm Oversize | ||
| 1st Compression Ring | 100 | |
| 2nd Compression Ring | 100 | |
| Oil Control Ring | Yellow | |
NOTE:
Lower side rail and second compression ring share same gap position on piston.