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 TM 55-1905-223-24-3
REPLACEMENT
a.
Install the crankshaft gear (10, Figure 4-39) on the crankshaft (5).
(1)
Install the key (9) in the crankshaft keyway.
(2)
Heat the gear for a minimum of 1 hour at 400 (205 ).
F
C
WARNING
Wear protective gloves to prevent personal injury when handling parts that
have been heated.
NOTE
The gear must be installed within 30 seconds after being heated.
CAUTION
The timing mark and the gear part number must be facing away from the crankshaft.
(3)
Align the gear keyway and the key, and install the gear firmly on the crankshaft.
CAUTION
It will be necessary to align the timing marks (Figure 3-42) of the crankshaft
and the camshaft gears when the crankshaft is installed (paragraph 3-23).
b.
Install the crankshaft.
CAUTION
The cylinder block saddle and the cap mating surfaces must be clean and dry
when the bearing shells are installed. Used bearings must be installed in their
original location.
NOTE
The upper main bearing shells have a groove and oil hole to permit lubrication
of the crankshaft. The upper shells for the No's 2, 4 and 6 are the same. The
groove in the shell for No. 7 is not in the center of the shell. Install the No. 7
shell so the wider part of the shell, from the groove, is toward the flywheel end
of the cylinder block. Also, each shell has a groove for the dowel ring. Install
the shell so the groove will be next to the counterbore in the cylinder block.
4-93
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