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 TM 55-1905-219-14-11
5-79. 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 considered 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 a 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 replacement 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.
j.
Replace loose or damaged dowel pins. The dowels
at the ends of the cylinder block must extend .630
inch from the cylinder blocks. The dowels used to
retain the crankshaft thrust washers on the rear
main bearing cap must extend .110 inch to .120 inch
from the surface of the bearing cap.
5-1085
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