TM 5-3895-383-24
NOTICE
If the crankshaft is turned in the wrong direction during
upper main bearing half removal the tab of the bearing will
be pushed between the crankshaft and the cylinder block.
This can cause result in damage to either or both the
crankshaft and the cylinder block.
NOTE:
Some crankshaft main journals have no oil hole.
To remove these upper main bearing halves, put a
thin piece of soft material (that will not damage
the crankshaft journal) against the end of the
bearing half, opposite the tab. Hit the bearing
with the soft material until the tab of the bearing is
free from the groove in the cylinder block.
2.
Remove the upper half of the man bearings as follows:
a.
Turn the crankshaft until Tool (A) can be installed in
the crankshaft journal. Install Tool (A) as shown.
b.
Turn the crankshaft in the direction which will push
the upper main bearing half out, tab end first.
c.
Check the condition of the main bearings. Refer to
"Guideline For Reusable Parts, Main & Connecting
Rod Bearings", SEBF8009 and SEBD0531 as a guide
for checking bearing conditions.
NOTE:
The following steps are for the installation of the
crankshaft main bearings.
3.
Clean the bearing surfaces in the cylinder block for the
main bearings. Apply clean engine oil on the upper
main bearing half. Do not put oil on the back side of the
bearing. Using Tool (A), install the upper main bearing
half (bearings with the oil holes) in the cylinder block.
Be sure the tab on the back side of the bearing engages
with the groove in the cylinder block.
4.
Clean the bearing surface of the main bearing caps.
Install the lower main bearing half in the main bearing
cap. Be sure the tab on the back side of the bearing
engages with the groove in the main bearing cap. Apply
clean engine oil on the lower main bearing half. Do not
put oil on the back side of the bearing.
5.
Install the main bearing caps as follows:
8-55
