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 TM 10-3930-638-24&P
4-2. ENGINE MAINTENANCE (cont)
d. Crankshaft and Main Bearings (cont).
REMARKS
ITEM
ACTION
STEP
LOCATION
INSPECTION (cont)
10
e. Replacement main
Remove and
Rework by removing 0.030 inch stock
(cont)
rework
bearing cap (4,
from mating surface. Then, bore out to
5,6, or 7)
meet tolerance specified in c above. If
0.039 inch stock is removed, machine
same amount from lock groove
NOTE
Machine new mounting surface flat so main bearing cap will set
solid without wobbling in cylinder block.
f. Two cap screws (3)
Remove
and replacement
main bearing cap
(4, 5,6, or 7)
INSTALLATION
11
Crankshaft (8)
a. Key (10)
Position
On crankshaft
WARNING
Wear asbestos gloves to prevent burning your hands when perform-
ing following step. If you burn your hands, obtain medical aid
immediately.
b. Crankshaft
Heat and
Use gear and bearing heater. Timing mark
gear (9)
install
on gear must be outward
12
Cylinder
a. Bearing liner
Clean
Remove all dust, dirt or grease. Dirt left
bore
behind bearing liners will interfere with
lubrication cooling resulting in hot spots
and premature failure of liners
4-32
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