Piston Ring: Testing and Inspection

Inspection

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 one of the same size as the piston.

CAUTION:
^ Marks are shown on the end of top and second rings. When installing the rings to piston, face this mark upward.
^ Oil ring consists of upper rail, expander and lower rail. When installing on piston, be careful of each rail's direction.





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








3. 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.