TM 5-4310-354-14
rod cap (2, figure 7-55) and lower bearing
1.
Cap bolt (2)
(3) to the connecting rod (11).
2.
Connecting rod cap
3.
Lower bearing
(7) Remove the remaining pistons and
4.
Upper bearing
connecting rod assemblies in a similar
5.
Piston ring, top (1)
manner.
Rotate the crankshaft as
6.
Piston ring,
necessary to provide easy access to each
second and third (2)
connecting rod cap.
7.
Piston ring, bottom (1)
8.
Retaining ring (2)
(8) Secure the connecting rod (11) in a vise
9.
Piston pin
equipped with soft jaws and remove the
10.
Piston
piston rings (5, 6, 7) with a piston ring
11.
Connecting rod
expander tool.
12.
Piston pin bushing
(9) To disconnect the connecting rods (11)
from the pistons (10), remove the piston
pin retaining rings (8) and push the pin (9)
out of the piston (10) and piston pin
bushing (12).
b. Cleaning, Ins pection, and Repair.
(1) Clean all parts in accordance with para
deposits, use a suitable chemical carbon
solvent that will not attack the aluminum
pistons (10, figure 7-55) or the bronze
piston pin bushings (12).
(2) Clean the compression ring grooves of the
piston (10). This can be done with a
broken compression ring that has been
ground to a bevel edge.
TS 5-4310-354-14/7-55
(3) Using a standard aligning fixture, check
Figure 7-55. Piston, piston rings, and connecting
the connecting rod (11) for distortion and
rod assembly, disassembly and reassembly.
misalignment. Check the connecting rods
(11), caps (2), and bolts (1) for cracks with
magnetic particle test.
Discard and
replace parts if cracks are detected.
(4) Inspect the connecting rod bearings (3, 4)
for scoring, chipping, flaking, pits, cracks,
and signs of overheating. Bright spots on
back of bearings indicate shifting and are
cause for replacement.
(5) Check the piston pin bushing (12) for
scoring or wear. Replace bushing if bore
is scored or if worn to more than 1.2523
inches (31.8084 mm).
Press worn
bushing (12) from connecting rod (11) and
press in new one.
(6) Inspect the piston pin (9) for wear or
scoring. Replace pin if worn to less than
1.2478-inch (31.6941 mm) diameter.
TS 5-4310-354-14/7-56
Maximum allowable pin clearance in
piston is 0.0005 inch
Figure 7-56. Piston and connecting rod, removal.
7-61
