Section XIX. CRANE ENGINE CRANKSHAFT ASSEMBLY
must be paid to the end play of the crankshaft as
122. General
excessive play may cause damage to the front main
The crane engine crankshaft assembly is forged of
bearings. The crankshaft is drilled for continuous
high carbon steel and is carried on seven large main
lubrication.
It is both statically and dynamically
bearings. Special attention
balanced. The front end of the shaft is machined to
extend through the oil seal in the front cover, to
accommodate the fan drive pulley.
123.
Crane Engine Crankshaft Assembly Removal
and Disassembly
a. Removal.
(1) Remove the front mount and pulley (par.
(2) Remove the flywheel and housing (par.
(3) Remove oil pan and filler blocks (par. 95).
(4) Remove the oil pump (par. 99).
(5) Remove the connecting rod caps (par.
(6) Remove the timing gears (par. 115).
(7) Remove the crankshaft assembly as
instructed on figure 30.
b. Disassembly. Disassemble the crane engine
crankshaft assembly as illustrated on figure 31.
124.
Crane Engine Crankshaft Assembly Cleaning,
Inspection, and Repair
1 Screw, cap, i-13 x 8A in. (2 rqr)
2 Washer, lock, % in. (2 rqr)
a. Cleaning.
Clean all parts in an approved
3 Trunnion, upper
cleaning solvent and dry thoroughly.
4 Liner
5 Liner
b. Inspection and Repair.
6 Nut, %-13
7 Washer, lock, IET, % in.
(1) Inspect the crankshaft for scored or
8 Ground strap
damaged bearing journals, cracks,
9 Nut, %-18
breaks, or other damage. Replace a
10 Washer, lock, % in.
defective crankshaft as necessary.
11 Trunnion, lower
12 Shim
(2) Inspect the connecting rod bearings and
13 Nut, %-10 (4 rqr)
crankshaft main bearings for scores,
14 Washer, lock, (4rqr)
cracks, breaks, or excessive wear.
15 Screw, cap, %-10 x 6 in. (4 rqr)
16 Radiator support (2 rqr)
(3) Inspect the bearing caps for breaks,
17 Front engine mount
cracks, or other damage.
Figure 27. Crane engine front mount assembly,
(4) Inspect the main bearing journals, the 1
exploded view.
TAGO 5030A
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