Piston Ring, Engine

Piston ring end gap
Compression (top and bottom, in gauge) 0.25 - 0.50 mm (0.01 - 0.02 in.)
Oil ring (steel rail, in gauge) 0.25 - 1.25 mm (0.010 - 0.049 in.)
Piston ring groove width
Compression (top and bottom) 1.530 - 1.555 mm (0.0602 - 0.0612 in.)
Oil 4.030 - 4.055 mm (0.1587 - 0.1596 in.)
Piston ring width
Compression (top and bottom) 1.460 - 1.490 mm (0.0575 - 0.0587 in.)
Oil Side seal-snug fit ring
Service limit Side clearance 0.015 mm (0.0006 in.) maximum