Piston Ring, Engine

Ring groove clearance
Top 0.03 - 0.07 mm (0.0012 - 0.0027 inch)
2nd 0.02 - 0.06 mm (0.0008 - 0.0023 inch)
Piston ring end gap
Top ring
Standard 0.20 - 0.35 mm (0.0079 - 0.0137 inch)
Limit 0.7 mm (0.276 inch)
2nd ring
Standard 0.35 - 0.50 mm (0.0138 - 0.0196 inch)
Limit 0.7 mm (0.0276 inch)
Oil ring
Standard 0.20 - 0.70 mm (0.0079 - 0.0275 inch)
Limit 1.8 mm (0.0709 inch)