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 TM 55-1905-220-14-11
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 N )
m
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 N ) torque. Line-bore the block, but do not remove more
m
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.
5-1087
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