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 TM 55-1905-219-14-10
5-20. CYLINDER BLOCK-MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECT (Cont)
(3)
Main bearing bores are line-bored with the bear-
ing caps in place and thus are in longitudinal
alignment. Bearing bores may be considered
properly aligned with one another if the crank-
shaft can be rotated freely by hand after new
bearing shells have been installed and lubri-
cated and the bearing caps have been secured in
place and the bolts tightened to 180-190 lb-ft
(244.0-257.6 N ) torque. If a main bearing bore
m
is more than .001 inch out of alignment, the
block must be line-bored or scrapped. Mis-
alignment 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 bear-
ing 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 of 4.812 inch
to 4.813 inch.
j.
Replace loose or damaged dowel pins. The dowels
at the ends of the cylinder block extend .630
inch from 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 bear-
ing cap.
k.
If used, replace damaged or broken cylinder head
studs. Drive new studs to a height of 4 3/8 inches
1/32 inch above the block at a minimum of 75 lb-ft
(101.7 N ) torque. Also examine the cylinder head
m
retaining bolt holes. If the threads are damaged,
use a tap to "cleanup" the threads or install a
helical thread insert.
5-374
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