Piston Ring, Engine

Piston ring groove clearance
No. 1 0.03 to 0.07 mm (0.0012 to 0.0028 inch)
No. 2 0.02 to 0.06 mm (0.0008 to 0.0024 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 (Side rail) 0.110 to 0.35 mm (0.0039 to 0.0138 inch)
Maximum
No. 1 0.91 mm (0.0358 inch)
No. 2 1.06 mm (0.0417 inch)
Oil (Side rail) 0.82 mm (0.0323 inch)