Piston ring end gap Top ring 0.20 ~ 0.35 mm (0.008 ~ 0.014 in) : 0.60 mm (0.024 in) 2nd ring 0.75 ~ 0.90 mm (0.030 ~ 0.035 in) : 1.25 mm (0.049 in) Oil ring 0.20 ~ 0.70 mm (0.008 ~ 0.028 in) EBS00251 CHECKING THE PISTON PIN 1. Check: piston pin Blue discoloration/grooves Replace the piston pin and then check the lubrication system. 2. Measure: piston pin outside diameter a Out of specification Replace the piston pin. Piston pin outside diameter 22.991 ~ 23.000 mm (0.9052 ~ 0.9055 in) : 22.971 mm (0.9044 in) 3. Measure: piston pin bore inside diameter b Out of specification Replace the piston. Piston pin bore inside diameter 23.004 ~ 23.015 mm (0.9057 ~ 0.9061 in) :
23.045 mm (0.9073 in) 4 - 38 CYLINDER AND PISTON ENG