Piston Ring, Engine

Piston ring end gap - compression (top, in gauge) 0.17-0.33 mm (0.0067-0.0130 inch)
Piston ring end gap - 0.3-0.55 mm compression (bottom, in gauge) (0.0118-0.0217 inch)
Piston ring end gap - oil ring (steel rail, in gauge) 0.15-0.65 mm (0.006-0.026 inch)
Piston ring groove width - compression (top) Piston ring groove width - compression (bottom) 1.535-1.52 mm (0.0603-0.0598 inch)
Piston ring groove width - oil 3.05-3.03 mm (0.12001-0.11929 inch)
Piston ring width compression (top and bottom) 1.460-1.490 mm (0.05748-0.05866 inch)
Piston ring width - oil ring Side seal, snug fit
Piston ring-to-groove clearance - 1st ring 0.030-0.065 mm (0.0012-0.00315 inch)
Piston ring-to-groove clearance - 2nd ring 0.030-0.070 mm (0.0012-0.0028 inch)