TM 5-3805-261-34
ENGINE MAINTENANCE.
13-5.
Crankshaft Main Bearings. (Sheet 5 of 12)
INSPECTION (Front, Center and Rear Main
Bearings)
CAUTION
New upper main bearings must
be installed with locating
tabs positioned in slot of
cylinder block. Failure to
follow this procedure could
result in damage to block,
crankshaft, or both.
3.
Install tool in crankshaft
journal (Figure 13-21).
4.
Coat upper half of three main
bearings (6, Figure 13-19) with
clean engine oil.
5.
Position three upper main
bearings (6) in cylinder block
above front, center and rear
crankshaft journals with bearing
tabs toward tab locators in
block.
CAUTION
When installing bearings in
cylinder block, crankshaft
must be rotated in OPPOSITE
DIRECTION from normal engine
rotation. Failure to follow
this procedure could result
in damage to block,
crankshaft, or both.
6.
Rotate crankshaft and tool
against new upper main bearings
(6, Figure 13-21) to push
bearings into position. For this
step, rotate crankshaft clockwise
when engine is viewed from rear.
7.
Cut plastigage in three pieces
approximately 1-1/2 inches long.
Figure 13-21.
Go to Sheet 6
13-25
