Piston Ring, Engine

Piston ring
Side clearance
No. 1 0.03 - 0.07 mm (0.0012 - 0.0028 inch)
No. 2 0.02 - 0.06 mm (0.0008 - 0.0024 inch)
Oil ring 0.06 - 0.15 mm (0.0024 - 0.0059 inch) 0.1 mm (0.0039 inch)
End gap
No. 1 0.25 - 0.35 mm (0.0098 - 0.0138 inch) 0.8 mm (0.031 inch)
No. 2 0.40 - 0.55 mm (0.0157 - 0.0216 inch) 0.8 mm (0.031 inch)
Oil ring side rail 0.10 - 0.40 mm (0.0039 - 0.0157 inch) 1.0 mm (0.039 inch)