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TN 10-3930-643-34
GENERAL SUPPORT ENGINE, FUEL, EXHAUST AND COOLING MAINTENANCE. (cont)
13-4.
Crankshaft. (Sheet 6 of 9)
CLEANING/INSPECTION (cont)
13.
14.
15.
16.
17.
18.
19.
NOTE
If crankshaft or connecting rod
journals have been overheated or a
bearing has spun, crankshaft must
be magnafluxed.
Inspect main journals of crankshaft
(8) for scoring.
Using a micrometer, measure diameter
of each crankshaft (8) journal in two
or three places.
Journal diameter
should be 3.3742 to 3.3755 inches.
Using a micrometer, measure diameter
of each connecting rod journal in two
or three places
with micrometer.
Journal diameter should be 2.9977 to
2.9990 inches.
Using a sclerometer, measure hardness
in at least three locations on
each
crankshaft (8) and connecting rod
journal.
Minimum hardness is -45 Rc.
Replace crankshaft (8) if journals
are scored or if test
results
are
outside acceptable limits.
Inspect crankshaft (8) for sludge
deposits or other obstructions in oil
jet holes in each journal.
Inspect all other parts. Refer to
paragraph 2-9.
Go to sheet 7
13-30
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