Piston Ring, Engine

Piston Ring
Piston ring end gap compression (top, gauge diameter) 0.100 - 0.250 mm (0.0039 - 0.0098 inch)
Piston ring end gap compression (bottom, gauge diameter) 0.27 - 0.42 mm (0.0106 - 0.0165 inch)
Piston ring end gap oil ring (steel rail, gauge diameter) 0.15 0.65 mm (0.0059 0.0255 inch)
Piston ring end gap compression (top, service limit) 0.50 mm (0.0196 inch) maximum
Piston ring end gap compression (bottom, service limit) 0.65 mm (0.0255 inch) maximum
Piston ring end gap oil ring (steel rail, service) 0.90 mm (0.0354 inch) maximum
Piston ring groove width compression (top) 1.230 - 1.245 mm (0.0484 - 0.0490 inch)
Piston ring groove width * compression (bottom) 1.530 - 1.545 mm (0.0602 - 0.0608 inch)
Piston ring groove width oil ring 3.030 - 3.055 mm (0.1192 - 0.1203 inch)
Piston ring width
Piston ring to groove clearance