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 maximum (0.0196 inch)
Piston ring end gap - compression (bottom, service limit) 0.65 mm maximum (0.0255 inch)
Piston ring end gap - oil ring (steel rail, service limit) 0.90 mm maximum (0.0354 inch)
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
Piston pin bore diameter 21.008 - 21.012 mm (0.8270 - 0.8272 inch)
Piston pin diameter 21.011 - 21.013 mm (0.8271 - 0.8273 inch)
Piston pin length 60.51 - 60.08 mm (2.382 - 2.365 inch)
Piston pin-to-piston fit 0.002 to 0.009 mm (0.00007 - 0.00003 inch)
Piston-to-connecting rod clearance