Piston Ring, Engine

Piston ring
Side clearance
No. 1 ring 0.04 - 0.078mm (0.0016 - 0.0031 in.)
Limit 0.1 mm (0.004in.)
No. 2 ring 0.03 - 0.07mm (0.0012 - 0.0027in.)
Limit 0.1 mm (0.004in.)
Oil ring 0.06 - 0.15mm (0.0024 - 0.0059in.)
Limit 0.2mm (0.008in.)
End gap
No. 1 ring 0.17 - 0.32mm (0.0067 - 0.0126in.)
Limit 0.6mm (0.0236in.)
No. 2 ring 0.32 - 0.47mm (0.0126 - 0.0185in.)
Limit 0.7mm (0.0275in.)
Oil ring 0.20 - 0.70mm (0.0078 - 0.0275in.)
Limit 0.8mm (0.0315in.)