Piston Ring, Engine

Piston Ring End Gap
First Compression Ring 0.18 - 0.39 mm (0.007 - 0.015 inch)
Second Compression Ring 0.48 - 0.74 mm (0.019 - 0.029 inch)
Oil Control Ring 0.25 - 0.74 mm (0.010 - 0.029 inch)

Piston Ring to Groove Clearance
First Compression Ring 0.03 - 0.076 mm (0.001 - 0.003 inch)
Second Compression Ring 0.04 - 0.078 mm (0.002 - 0.003 inch)
Oil Control Ring 0.09 mm (0.004 inch)

Piston Ring Thickness
First Compression Ring 1.164 - 1.190 mm (0.046 - 0.047 inch)
Second Compression Ring 1.472 - 1.490 mm (0.058 inch)
Oil Control Ring - Maximum 2.440 mm (0.096 inch)