Piston Ring, Engine

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