Piston Ring Service
- Measure piston ring side and end clearance for all pistons and replace rings as necessary. When replacing ring in cylinder bore not needing reconditioning, check ring end gap at lower part of cylinder that is less worn.
- When replacing a ring, be sure to use one of the same size. Install rings on piston with end gaps staggered at 120° intervals, but make sure no ring gap is in line with thrust face of pin bore. Also be sure the manufacturer's marks are facing upward when rings are installed.
CAUTION:
Install oil ring first without using a ring expander. Spacer expander gap should be installed more than 45° from side rail gaps. Rails should turn smoothly when installed.
PISTON RING SIZES
| Ring Size | Size Mark |
|---|---|
| Standard | No Mark |
| .25 mm Oversize | 25 |
| .50 mm Oversize | 50 |
| .75 mm Oversize | 75 |
| 1.0 mm Oversize | 100 |