Piston Ring, Engine

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