Piston Ring, Engine

PISTON RING

Piston ring gap
Top ring
STD 0.20 - 0.25 mm (0.0079 - 0.0098 in.)
Limit -1.0 mm (0.039 in.)
Second ring
STD 0.37 - 0.52 mm (0.015 - 0.020 in.)
Limit 1.0 mm (0.039 in.)
Oil ring
STD 0.20 - 0.50 mm (0.0079 ? 0.0197 in.)
Limit 1.5 mm (0.059 in.)
Ring groove gap
Top ring
STD 0.040 - 0.080 mm (0.0016 - 0.0031 in.)
Limit 0.15 mm (0.0059 in.)
Second ring
STD 0.030 - 0.070 mm (0.0012 - 0.0028 in.)
Limit 0.15 mm (0.0059 in.)

Note: STD = Standard