Piston Ring, Engine

Piston ring end gap - compression (top, gauge diameter) 0.15-0.25 mm (0.0059-0.0098 inch)
Piston ring end gap - compression (bottom, gauge diameter) 0.30-0.55 mm (0.0118-0.0216 inch)
Piston ring end gap - oil ring (steel rail, gauge diameter) 0.15-0.45 mm (0.0059-0.0177 inch)
Piston ring groove width - compression (top) 1.230-1.25 mm (0.0484-0.0492 inch)
Piston ring groove width - compression (bottom) 1.530-1.55 mm (0.0602-0.0610 inch)
Piston ring groove width - oil ring 2.53-2.55 mm (0.0996-0.1003 inch)
Piston ring width - upper comp ring 1.17-1.19 mm (0.0460-0.0468 inch)
Piston ring width - lower comp ring 1.47-1.49 mm (0.0578-0.0586 inch)
Piston ring-to-groove clearance (upper and lower compression rings) 0.040-0.080 mm (0.0015-0.0031 inch)