Piston Ring, Engine

Piston ring groove clearance
No.1 0.02 - 0.07 mm (0.0008 - 0.0028 inch)
No.2 0.02 - 0.06 mm (0.0008 - 0.0024 inch)
Oil 0.03 - 0.11 mm (0.0011 - 0.0043 inch)
Piston ring end gap
Standard No.1 0.25 - 0.35 mm (0.0098 - 0.0138 inch)
No.2 0.35 - 0.45 mm (0.0138 - 0.0177 inch)
Oil (Side rail) 0.15 - 0.40 mm (0.0059 - 0.0157 inch)
Maximum No.1 0.95 mm (0.374 inch)
No.2 1.05 mm (0.413 inch)
Oil (Side rail) 1.00 mm (0.394 inch)