| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-223-24-5
REPAIR
a.
Repair the crankshaft bore of the connecting rod (1, FIGURE 4-31) if:
(1)
The bore is larger than 3.3167 inch (84.244 mm).
(2)
The face of the connecting rod (1) is damaged.
b.
To make repairs:
(1)
Use the bushing driver, ST-1242, to remove the piston pin bushing (2).
(2)
Install the cap on the connecting rod (1) and tighten the machine bolts (10) to the torque
listed in Table 4-9.
(3)
Use the checking fixture, ST-561, to measure the length of the rod (1). Discard the
rod if the length is 11.991 inches (304.57 mm) or less.
(4)
Remove the cap from the rod (1).
NOTE
A maximum of 0.009 inch (0.23 mm) can be removed from the rod
and cap. Equal amounts of material must be removed from the rod
and the cap. The length of the rod must be 12.000 inches (304.80
mm) before you can remove a maximum of 0.009 inch (0.23 mm)
from the rod and cap. If the maximum of 0.009 inch (0.23 mm) had
to be removed, the rod must measure 11.991 inches (304.57 mm) in
length after machining.
The alignment of the bolt bores in the rod (1) and cap must not
change. Hold the rod (1) and cap in a clamp that holds the rod in
alignment when cutting material from the surfaces.
Use lapping compound to polish the surfaces that were
machined. Apply a blue compound to the surfaces and check
them against a flat plate.
The area outside the centerline of the bolt bores (the area
farthest from the crankshaft bore) must show 100 percent contact.
The remaining area must show a minimum of 75 percent contact.
(5)
Install the cap on the rod (1) and tighten the machine bolts (10) to the torque listed in Table 4-9.
(6)
Cut the crankshaft bore with the boring machine, P/N 3375115, that has a precision fixture to keep
the piston pin bore and crankshaft bore in alignment. The surface of the bore must be smooth
within 75 micro-inches.
(7)
Put the connecting rod (1) in the fixture, P/N ST 561, and check the alignment.
4-75
|
||
|
||
