Piston Ring: Service and Repair

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

NOTE:
^ Marks that shows the installing direction are shown on the end of top and second rings. When installing them to piston, face this mark to the top side.
^ Oil ring consists of the upper rail, expander and lower rail. When installing the oil ring on piston, be careful of each rails direction.





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








3) Fit the piston ring straight into the piston ring groove, then measure the clearance between piston ring and piston ring groove with a thickness gauge.

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