Piston Ring, Engine

Piston ring
Side clearance
No.1 0.04 - 0.08mm (0.0015 - 0.0031 in) 0.1mm (0.004in)
No.2 0.03 - 0.07mm (0.0012 - 0.0027in)
End gap
No. 1 0.20 - 0.35mm (0.0079 - 0.0138in) 1mm (0.039in)
No.2 0.37 - 0.52mm (0.0146 - 0.0205in) 1mm (0.039in)
Oil ring side rail 0.20 - 0.60mm (0.0078 - 0.0236in) 1 mm (0.039in)
Service oversize 0.25, 0.50mm (0.010, 0.020in.) oversize