TM 5-2420-230-24-2
Bearings, Main (001-006)
B3.9 and B5.9 Series Engines
Page 1-18
Section 1 - Cylinder Block - Group 01
Install the lower main bearings into the main bearing caps.
Apply a coat of clean lubricating engine oil to the inside of
the main bearings.
NOTE: Do not lubricate the back of the bearing shell.
CAUTION
Make sure the caps are correctly installed with the num-
ber toward the oil cooler side of the engine. Failure to
do so can result in engine damage.
23 mm
Install a main bearing cap after each upper main bearing
is installed to keep the main bearing in place while the other
uppers are installed.
Torque Value: 50 Nm
[37 ft-lb]
Do not tighten to the final torque value at this time.
Use the same procedure to remove and install rear main
bearing cap, No. 5 or No. 7.
CAUTION
Use care so the screwdriver does not damage the crank-
shaft or cylinder block.
Flat-Blade Screwdriver
NOTE: The front main, No. 1, does not have a hole in the
journal, so the pin can not be used to replace the bearing.
Use a flat-blade screwdriver. Gently bump the end of the
bearing to loosen it from the cylinder block. Then, use
finger pressure against the main bearing shell, and rotate
the crankshaft to roll the main bearing out.
L-696
