f. If out of specification, replace the cylinder, and the piston and piston rings as a set. LLL L L LLL L L LLL L L LLL L L LLL L L LLL L LLL EBS00250 CHECKING THE PISTON RINGS 1. Measure: piston ring side clearance Out of specification Replace the piston and piston rings as a set. NOTE: _ Before measuring the piston ring side clear- ance, eliminate any carbon deposits from the piston ring grooves and piston rings. Piston ring side clearance Top ring 0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in) : 0.12 mm (0.0047 in) 2nd ring 0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in) : 0.13 mm (0.0051 in) 2. Install: piston ring (into the cylinder) NOTE: _ Level the piston ring into the cylinder with the piston crown.
a 50 mm (1.97 in) 3. Measure: piston ring end gap Out of specification Replace the piston ring. NOTE: _ The oil ring expander spacer’s end gap cannot be measured. If the oil ring rail’s gap is exces- sive, replace all three piston rings. 4 - 37 CYLINDER AND PISTON ENG