372.
Crane Engine Camshaft Assembly Cleaning
and Inspection
a.
Clean all parts with an approved cleaning
solvent and dry thoroughly.
b.
Inspect the camshaft bearing journal for
diameter of 2.242 inch minimum to 2.243 inch
maximum.
c.
Inspect the cam lift clearance, the intake
should be 0.3395 inch, and the exhaust 0.352 inch.
d.
Inspect the camshaft end play for clearance
of 0.005 inch minimum to 0.009 inch maximum.
e.
Inspect the camshaft bushings for tolerance
Figure 205. Crane engine camshaft assembly,
of 2.2445 inch minimum and 2.2450 inch maximum.
removal and installation.
Inspect the bushing clearance for 0.0015 inch minimum
and 0.0030 inch maximum, with an allowable wear of
0.005 inch.
373.
Crane Engine Camshaft Assembly Installation
f.
Inspect the tappet hole for a diameter of
a.
Install the camshaft assembly as illustrated
1.125 inch minimum to 1.126 inch maximum diameter.
on figure 205.
g.
Inspect the tappet hole clearance for 0.0006
b.
Install the timing gears (para. 369).
inch minimum to 0.002 inch maximum.
c.
Install the oil pump (para. 353).
d.
Install the valves (para. 345).
e.
Install the front mount and pulley (para. 365).
Section XXII. CRANE ENGINE CRANKSHAFT ASSEMBLY
(3) Remove oil pan and filler blocks (para.
374.
General
The crane engine crankshaft assembly is forged of
(4) Remove the oil pump (para. 851).
high carbon steel an d is carried on seven large main
(5) Remove the connecting rod caps (para.
bearings. Special attention must be paid to the end play
of the crankshaft as excessive play may cause damage
(6) Remove the timing gears (para. 367).
to the front main bearings. The crankshaft is drilled for
continuous lubrication.
It is both statically and
(7) Remove the crankshaft assembly as
dynamically balanced. The front end of the shaft is
instructed on figure 206.
machined to extend through the oil seal in the front
b.
Disassembly. Disassemble the crane engine
cover, to accommodate the fan drive pulley.
crankshaft assembly in numerical sequence as
illustrated on figure 207.
375.
Crane Engine Crankshaft Assembly Removal
and Disassembly
376.
Crane Engine Crankshaft Assembly Cleaning,
Inspection, and Repair
a.
Removal.
(1) Remove the front mount and pulley
a.
Cleaning. Clean all parts in an approved
cleaning solvent and dry thoroughly.
(2) Remove the flywheel and housing (para.
AGO 6819A
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