Piston Ring, Engine

Piston ring end gap - compression (top) 0.150 - 0.300 mm (0.006 - 0.0018 inch)
Piston ring end gap - compression (bottom) 0.300 - 0.550 mm (0.0018 - 0.0022 inch)
Piston ring end gap - oil 0.15 - 0.66 mm ring (steel rail) (0.00591 - 0.02598 inch)
Piston ring groove width * compression (top) 1.230 - 1.250 mm (0.0484 - 0.00492 inch)
Piston ring groove width - compression (bottom) 1.520 - 1.540 mm (0.05984 - 0.06062 inch)
Piston ring groove width * oil ring 3.030 - 3.055 mm (0.0018 - 0.0022 inch)
Piston ring width - compression (top and maximum bottom) 1.00 mm (0.03937 inch) maximum
Piston ring width - oil ring 1.15 mm (0.04528 inch) maximum
Piston ring-to-groove clearance-compression (top) 0.0090 - 0.0235 mm (0.000354-0.000925 inch)
Piston ring-to-groove clearance-compression (bottom) 0.030 - 0.080 mm (0.00118 - 0.00315 inch)
Piston ring-to-groove clearance-oil ring snug fit