Piston Ring, Engine

Piston ring
Ring closed gap
Top ring
Standard 0.20-0.35 mm (0.0079-0.0138 in.)
Limit 1.0 mm (0.039 in.)
Second ring
Standard 0.37-0.52 mm (0.0144-0.0203 in.)
Limit 1.0 mm (0.039 in.)
Oil ring
Standard 0.20-0.50 mm (0.0079-0.0197 in.)
Limit 1.5 mm (0.059 in.)

Ring groove gap
Top ring
Standard 0.040-0.080 mm (0.0016-0.0031 in.)
Limit 0.15 mm (0.0059 in.)
Second ring
Standard 0.030-0.070 mm (0.0012-0.0028 in.)
Limit 0.15 mm (0.0059 in.)