Piston Ring: Service and Repair
PISTON RING1. 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:
^ The top ring and second ring have the mark to determine the direction to install on them. When installing the ring to piston, face this mark to the top side.
^ Oil ring consists of the upper rail, expander and lower rail. When installing on the piston, be careful of the direction of each rail.
2. Squarely place the piston ring and oil ring in cylinder, 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.
