TM 5-3805-260-24
CRANKSHAFT MAIN BEARINGS
REMOVE AND INSTALL CRANKSHAFT
MAIN BEARINGS
Tools Needed
A
B
C
D
2P5518
Bearing Tool
1
5B1161
Wire
*
8S5131
Adapter
1
8S2328
Dial Test Indicator
1
Group1
start by:
a)
remove oil pan
1.
Check each main bearing cap for its location on the
engine. Each cap has a number which gives the
location of that cap. Make a note that the number
on each cap is toward the front of the cylinder
block.
2.
Remove the bolts and washers that hold main
bearing cap (2) in place. Remove the bearing cap
and the lower half of the main bearing. 3. Remove
bearing (1) from the bearing cap.
NOTE: When the No. I main bearing cap is removed or installed
use tool (C) to remove and install the bolts that hold it.
4.
Turn the crankshaft until tool (A) can be installed in
the oil hole in the crankshaft journal. Install tool
(A). Turn the crankshaft in the direction which will
push the upper main bearing out, tab end first.
CAUTION: If the crankshaft is turned in the wrong direction, the
tab of the bearing will be pushed between the crankshaft and the
cylinder block. This will cause damage to the crankshaft and
block.
5.
Put clean engine oil on the lower bearings. Install
lower bearings in the bearing caps.
6.
Put clean engine oil on the upper bearings (the
bearing with the oil hole). Install upper bearings in
the cylinder block with tool (A).
NOTE: Be sure the tab on the back of the bearings fits in the
groove of the caps and cylinder block.
CAUTION: When bearing caps are installed, make sure the
number on the side of the cap is next to and respective with the
number on the engine block.
NOTE: When the bearing clearance is checked the crankshaft
will have to be lifted up against the upper halves of the main
bearings and held to get a measurement with wire (B). The wire
will not hold the weight of the crankshaft.
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