3-66
NOTE: If the piston pin bushing is replaced, the
lubrication hole must be aligned and the bushing
sized. It is recommended that only a qualified
machine shop replace bushings.
21. Examine the connecting rods for nicks, gouges,
discoloration, and stress lines.
DE623
22. Examine the piston pin bushing for galling or dis-
coloration. If either condition exists, replace the
bushing or connecting rod.
DE623A
23. Measure the piston pins making sure to keep them
with their respective piston/connecting rod. The
piston pins must measure within specifications.
DE351
24. Making sure pistons are clean and ring lands are
free of carbon deposits, measure ring-to-ring land
clearance using new piston rings. If ring-to-ring
land clearance is excessive, new pistons must be
installed.
DE367
25. Using a suitable outside micrometer, measure pis-
ton skirt diameter at a distance of 9 mm (0.350 in.)
from the bottom of the skirt and 90° from the pis-
ton pin axis. Pistons and cylinder measurements
must be within specifications as listed in the fol-
lowing chart. Class markings are stamped on the
cylinder deck.
DE354
DE356B
Class
Cylinder
Diameter
Piston Diameter
Clearance
A
74.990-75.000
(2.9523-2.9527 in.)
74.930-74.940 mm
(2.9499-2.9503 in.)
0.050-0.070 mm
(0.002-0.003 in.)
B
75.000-75.010 mm
(2.9527-2.9531 in.)
74.940-74.950 mm
(2.9503-2.9508 in.)
0.050-0.070 mm
(0.002-0.003 in.)
C
75.010-75.020 mm
(2.9531-2.9535 in.)
74.950-74.960 mm
(2.9508-2.9512 in.)
0.050-0.070 mm
(0.002-0.003 in.)
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