Piston Ring, Engine

Piston Ring End Gap
First Compression Ring 0.15 - 0.30 mm (0.006 - 0.011 inch)
Second Compression Ring 0.25 - 0.45 mm (0.009 - 0.017 inch)
Oil Control Ring 0.15 - 0.65 mm (0.06 - 0.025 inch)

Piston Ring to Groove Clearance
First Compression Ring 0.03 - 0.065 mm (0.001 - 0.002 inch)
Second Compression Ring 0.02 - 0.055 mm (0.0007 - 0.002 inch)
Oil Control Ring 0.01 mm (0.004 inch)

Piston Ring Thickness
First Compression Ring 1.175 - 1.190 mm (0.046 - 0.047 inch)
Second Compression Ring 1.475 - 1.490 mm (0.058 inch)
Oil Control Ring - Maximum 2.50 mm (0.098 inch)