TM 9-4940-549-14&P
Inspect crankshaft for cracks, nicks, and scratches on bearing
(4)
journals or other damage. Remove minor nicks and scratches
from bearing journals with crocus cloth. Clean to remove abra-
sive residue.
(5)
Perform magnetic particle inspection of crankshaft in accordance
with established procedures.
(6)
Remove minor nicks, burrs, and scratches from crankshaft bear-
ing journals by polishing with crocus cloth.
When regrinding crankshaft, it is imper-
ative that the 5/32-inch radius from jour-
nal to cheek be maintained. Crankshaft
breakage may result from improper grinding
of this fillet.
(7)
If necessary, regrind crankshaft bearing journals to accept
undersized bearings in accordance with table 12-1.
(8)
Inspect crankshaft gear for cracks and chipped, broken, or
excessively worn teeth.
(9)
If replacement of crankshaft gear is necessary, proceed as fol-
lows :
(a) Support crankshaft gear in arbor press and press crank-
shaft and woodruff key from gear.
(b) Heat replacement gear in an oven at 450oF (232.2oC) for
approximately one hour.
(c) Install woodruff key into crankshaft.
Wear asbestos gloves to avoid serious
burns when handling heated gear.
(d) Remove gear from oven and assemble onto crankshaft.
(e) Using a driver with an inside diameter of 2-inches, quickly
drive gear into position.
(f) Allow crankshaft and gear to cool.
(10)
Inspect connecting rod for cracks, breaks, and excessively
worn or damaged bushing.
Check piston pin for nicks, burrs, cracks, and excessive wear.
(11)
12-33
