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)