Piston Ring, Engine

Piston ring
Ring groove clearance
No. 1 Ring 0.020 to 0.070 mm (0.0008 to 0.0028 inch)
No. 2 Ring 0.020 to 0.060 mm (0.0008 to 0.0024 inch)
Oil Ring 0.020 to 0.070 mm (0.0008 to 0.0028 inch)
Standard end gap
No. 1 Ring 0.24 to 0.31 mm (0.0094 to 0.0122 inch)
No. 2 Ring 0.33 to 0.43 mm (0.0130 to 0.0169 inch)
Oil Ring 0.10 to 0.30 mm (0.0040 to 0.0119 inch)
Maximum end gap
No. 1 Ring 0.89 mm (0.0350 inch)
No. 2 Ring 1.37 mm (0.0539 inch)
Oil Ring 0.73 mm (0.0287 inch)