Piston Ring, Engine

SIDE GROOVE CLEARANCE
Top Ring 0.05 - 0.027 mm (0.0019 - 0.0027 inch)
Second Ring 0.05 - 0.027 mm (0.0019 - 0.0027 inch)
Oil Ring 0.05 - 0.021 mm (0.0019 - 0.0082 inch)

END GAP
Top Ring 0.25 - 0.50 mm (0.010 - 0.020 inch)
Second Ring 0.25 - 0.50 mm (0.010 - 0.020 inch)
Oil Ring 0.25 - 0.76 mm (0.010 - 0.040 inch)