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 TM 55-1905-221-14-4
6-29. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
INSPECT (Cont)
NOTE
Use the unfinished bearing caps for the front and intermediate bearing positions.
The finished bearing caps, machined for the crankshaft thrust washers, are to be
used in the rear bearing position.
(3) Main bearing bores are line-
bored with the bearing caps
in place and thus are in
longitudinal alignment.
Bearing bores may be con-
sidered properly aligned with
one another if the crankshaft
can be rotated freely by hand
after new bearing shells have
been installed and lubricated
and the bearing caps have been
secured in place and the bolts
tightened to 180-190 lb-ft
(244.0-257.6 Nm) torque. If
main bearing bore is more than
.001 inch out of alignment,
the block must be line-bored
or scrapped. Misalignment
may be caused by a broken
crankshaft, excessive heat or
other damage.
(4) If the main bearing bores are
not in alignment or a replace-
ment bearing cap is used, the
block must be line-bored.
Install the bearing caps in
their original positions
(without the bearing cap
stabilizers) and tighten the
bolts to 165-175 lb-ft (223.7-
237.3 Nm) torque. Line bore
the block, but do not remove
more than .001 inch stock.
After boring, all bores must
be within the specified limits
3.812 inch to 3.813 inch.
6-540
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