TM 55-4920-384-13&P
71066C
180178C
104721C
shaft and idler gear assembly can be removed from
In reassembly; be sure oil groove in shaft is facing
up. Drive shaft into crankcase with soft metal ham-
mer and maintain a .003 to .004 inch clearance be-
tween idler gear and shoulder of shaft.
OIL PAN
The engine can now be inverted so that the supports
and oil pan can be removed. See Fig. 24.
83615C
In reassembly, mount deep end of oil pan toward oil
nals, by allowing the rod bolts to strike or scrape
pump. Tighten mounting screws, 6 to 9 foot pounds
across them, when removing the connecting rod and
piston assemblies. Replace the caps on the rods im-
mediately so that they are in the correct position for
OIL PUMP
reassembly. A number is stamped on the side of the
To remove oil pump, first take out the slotted pipe
rod and cap to match each connecting rod with its
plug, and then with a 5/32 inch Allen wrench, remove
corresponding cap. These numbers must be on identi-
the oil pump lockscrew, as shown in Fig. 25. Remove
cal sides of the rod in reassembly. See Fig. 27.
locknut holding oil pump driving gear to shaft. Then,
The connecting rods have removable shell
with a soft brass rod or punch, drive shaft through
and care should be taken in reassembly that
they are
gear as shown in Fig. 26. The oil pump can then be
in place in the rod and cap. When replacing
the shell
b e a r i n g s , be sure and replace a complete
bearing
(2 halves).
The piston skirt is cam-ground to an elliptical con-
After removal of the oil pump, all of the connecting
tour. Clearance between the piston and cylinder must
rod bolts will be accessible. Remove the palnuts and
be measured at the center of the thrust face of the
hexagon nuts, then by tapping the ends of the bolts
piston skirt. Refer to Chart, Fig. 30, for proper clear-
lightly, being careful not to mar the threads, the con-
ante. The thrust faces on the piston skirt are 90
necting rod cap can be freed from the bolts. The rod
from the axis of the piston pin hole. See Fig. 28.
with the piston can now be pushed up through the
When reassembling the piston and connecting rod to
cylinder. Be careful not to score the crankshaft jour-
D-19