INSPECTION / REPAIR

B-57prose procedure

5
Measure each piston ring end gap with a feeler gauge. Replace the piston ring if necessary.
05U0BX-158

End gap — Topstandard

0.15—0.30 mm (0.006—0.012 in)mm

End gap — Secondstandard

0.15—0.30 mm (0.006—0.012 in)mm

End gap — Oil railstandard

0.20—0.70 mm (0.008—0.028 in)mm

Maximummaximum

1.0 mm (0.039 in)mm

1
Measure each piston pin hole diameter in X and Y directions at four points.
05U0BX-159

Specification	Value
Diameterstandard	19.988—20.000 mm (0.7869—0.7874 in)mm

Diameterstandard

19.988—20.000 mm (0.7869—0.7874 in)mm

2
Measure each piston pin diameter in X and Y directions at four points.
05U0BX-160
3
Calculate the piston pin-to-piston clearance.
4
If the clearance exceeds specification, replace the piston and/or piston pin.

Specification	Value
Diameterstandard	19.987—19.993 mm (0.7869—0.7871 in)mm
Clearancestandard	-0.005—0.013 mm (-0.0002—0.0005 in)mm

Diameterstandard

19.987—19.993 mm (0.7869—0.7871 in)mm

Clearancestandard

-0.005—0.013 mm (-0.0002—0.0005 in)mm

CONNECTING ROD

1
Measure each connecting rod bushing inner diameter.
05U0BX-161
2
Calculate the clearance between the connecting rod bushing and piston pin.
3
Measure each connecting rod for bending. Repair or replace the connecting rod if necessary.
05U0BX-162

Diameterbushing inner

20.003—20.014 mm (0.7875—0.7880 in)mm

Clearancebushing-to-pin

0.010—0.027 mm (0.0004—0.0011 in)mm

Bendingmax. per 50 mm

0.075 mm (0.0030 in) max./50 mm (1.97 in)mm