Piston Ring

End Gap
Nominal
Top Ring 0.23-0.49 mm (0.009055-0.01929 inch)
Second Ring 0.23-0.49 mm (0.009055-0.01929 inch)
Oil Ring Rail 0.15-0.66 mm (0.005910-0.02598 inch)
Maximum
Top Ring 1.00 mm (0.03937 inch)
Second Ring 1.00 mm (0.03937 inch)
Oil Ring Rail 1.25 mm (0.04921 inch)
Side Clearance, Minimum-Maximum
Top Ring 0.040-0.090 mm (0.0015748-0.001610 inch)
Second Ring 0.030-0.080 mm (0.0011810-0.003150 inch)
Oil Ring Snug Fit
Service Limit 0.015 mm (0.0005905 inch)