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 TM 5-4320-258-34
KEY to fig. 4-14:
loose piston pin-to-piston fit, and other damage; replace
damaged pistons. Refer to table 4-1 for wear limits.
(4) Check the piston ring groove side
1.
Starting jaw
clearance, using new piston rings. If side clearance
2.
Collar
exceeds the limits cited in table 4-1, replace the piston.
3.
Pulley
4.
Key
5.
Nut
checked and fitted to the cylinders at reassembly.
6.
Lock washer
Before reassembly, the cylinder bores must be checked
7.
Flywheel
as directed in paragraph 413c.
8.
Ring gear
9.
Flywheel bolt
(5) Inspect the connecting rods for cracks,
10.
Cotter pin
distortion, and other damage: replace damaged
11.
Nut
connecting rods. Refer to table 4-1 for wear limits.
12.
Connecting rod bolt
(6) Inspect the bearing shells for scoring,
13.
Bearing cap
wear, cracks, and other damage.
Check bearing
14.
Connecting rod bearing shell
thickness, using a ball micrometer. Thickness must not
15.
Retaining ring
be less than 0.0608 in all areas.
16.
Piston pin
17.
Piston ring set
Note: New bearing shells are smooth and
18.
Piston
highly polished. After a few hours of operation, the
19.
Sleeve bearing
bearing surface becomes a leaden grey and develops
20.
Connecting rod
minute craters so that the bearing surface has an almost
21.
Oil thrower
cellular appearance. This is normal, and is not an
22.
Crankshaft gear
indication of impending bearing failure.
23.
Key
24.
Thrust plate
(7) Inspect all other parts for cracks,
25.
Lock wire
scoring, damaged threads, and other damage; replace
26.
Intermediate bearing capbolt
damaged parts.
27.
Intermediate bearing cap
c. Reassembly and Installation.
28.
Ring dowel
29.
Intermediate main bearing
(1) Check piston fit in the cylinder bore (fig.
30.
Bearing cap bolt
31.
Flat washer
inch wide. Dress the edges of the feeler stock with a
32.
Rear bearing cap
stone to remove burrs and feathered edges. The block
33.
Rear main bearing
and pistons must be at room temperature when piston fit
34.
Front bearing cap
is tested. Position the feeler stock midway between the
35.
Dowel
piston pin bosses. With the piston inserted about 2
36.
Front main bearing
inches into the block, the feeler stock must pull from the
37.
Front intermediate main bearing cap
block with 5 to 10 pounds pull. If the feeler stock does
38.
Dowel
not offer enough resistance, perform the same test with
39.
Front intermediate main bearing
a new standard size piston. If sufficient resistance is still
40.
Crankshaft
not obtained, rebore the cylinders (para 4-13) and install
oversize pistons.
b.
Cleaning and Inspection.
(1) Discard and replace the piston rings.
(2) Clean all parts with cleaning solvent
(FED. Spec. P-D-680); dry thoroughly.
(3) Inspect the pistons for cracks,
distortion, broken ring bands and distorted grooves,
4-20
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