Piston Ring, Engine

DIMENSIONS
Ring Gap [1]
Standard Value:
Upper Ring 0.23 - 0.52 mm (0.009 - 0.020 inch)
Intermediate Ring 0.49 - 0.78 mm (0.019 - 0.031 inch)
Oil Control Ring 0.23 - 0.66 mm (0.009 - 0.026 inch)
Limit:
Upper Ring 0.8 mm (0.031 inch)
Intermediate Ring 1.0 mm (0.039 inch)
Oil Control Ring 1.0 mm (.039 inch)
Land Clearance (Diametrical) 0.740 - 0.803 mm (0.029 - 0.032 inch)
Piston Ring Groove Depth
Upper Ring 3.983 - 4.132 mm (0.157 - 0.163 inch)
Intermediate Ring 4.456 - 4.605 mm (0.175 - 0.181 inch)
Oil Control Ring 3.841 - 4.075 mm (0.151 - 0.160 inch)
Side Clearance
Upper/Intermediate Ring
Standard Value 0.025 - 0.065 mm (0.0010 - 0.0026 inch)
Limit 0.10 mm (0.004 inch)
Oil Ring 0.004 - 0.178 mm (0.0002 - 0.0070 inch)

[1] The measurement must be made with the ring positioned at least 12 mm (0.47 inch) from the bottom of cylinder bore.