Piston Ring, Engine

Piston Ring
Ring groove clearance
No. 1 0.02 to 0.07 mm (0.0008 to 0.0028 inch)
No. 2 0.03 to 0.07 mm (0.0012 to 0.0028 inch)
Oil 0.03 to 0.11 mm (0.0012 to 0.0043 inch)
Piston ring end gap
Standard
No. 1 0.25 to 0.35 mm (0.0098 to 0.0138 inch)
No. 2 0.35 to 0.50 mm (0.0138 to 0.0197 inch)
Oil 0.15 to 0.40 mm (0.0059 to 0.157 inch)
Maximum
No. 1 1.05 mm (0.0413 inch)
No. 2 1.20 mm (0.0472 inch)