4. Piston Ring

4. PISTON RING





1) If piston ring is broken, damaged, or worn, or it its tension is insufficient, or when the piston is replaced, replace piston ring with a new one of the same size as the piston.

CAUTION:
- "R" or "N" is marked on the end of the top and second rings. When installing the rings to the piston, face this mark upward.





- The oil ring is a combined ring consisting of two rails and a spacer in between. When installing, be careful to assemble correctly.








2) Squarely place piston ring and oil ring in cylinder, and measure the piston ring gap with a thickness gauge.





3) Measure the clearance between piston ring and piston ring groove with a thickness gauge.





CAUTION: Before measuring the clearance, clean the piston ring groove and piston ring.