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 0.07 - 0.15 mm (0.0028 - 0.0060 inch)
Piston ring end gap
Standard
No. 1 0.30 - 0.40 mm (0.0118 - 0.0157 inch)
No.2 0.40 - 0.50 mm (0.0157 - 0.0197 inch)
Oil (Side rail) 0.10 - 0.40 mm (0.0039 - 0.0157 inch)
Maximum
No.1 1.0 mm (0.039 inch)
No.2 1.1 mm (0.043 inch)
Oil (Side rail) 1.0 mm (0.039 inch)