Piston Ring, Engine

Piston ring groove clearance
No. 1 0.040 to 0.080 mm (0.0016 to 0.0031 in.)
No. 2 0.030 to 0.070 mm (0.0012 to 0.0028 in.)
Oil 0.020 to 0.065 mm (0.0008 to 0.0026 in.)

Piston ring end gap
Standard
No. 1 0.28 to 0.38 mm (0.0110 to 0.0150 in.)
No. 2 0.35 to 0.45 mm (0.0138 to 0.0178 in.)
Oil (Side rail) 0.13 to 0.38 mm (0.0051 to 0.0150 in.)
Maximum
No. 1 0.50 mm (0.0197 in.)
No. 2 0.80 mm (0.0315 in.)
Oil (Side rail) 0.65 mm (0.0256 in.)