TM 9-6115-604-34
NAVFAC P-8-633-34
WARNING
The weight of the crankshaft Is approximately 850 pounds (383 kg). Use of a lifting device not
rated for this weight may result In damage to components or Injury to personnel.
CAUTION
To avoid damage to the crankshaft journals, do not use an unpadded chain or cable sling on
the journals. Pad the chain or cable slings with sections of coolant hose of a suitable
diameter.
(12)
Using a padded sling around a connecting rod journal at each end of the crankshaft (32), lift the crankshaft
straight up out of the cylinder block (58) using an overhead hoist.
CAUTION
If at any time during the following procedures work Is suspended, the crankshaft must be
stored In a vertical position. Allowing the crankshaft to lie flat with unsupported main bearing
journals may cause misalignment.
(13)
Remove the crankshaft from the sling, and store it in a vertical position.
NOTE
As the main bearing shells are removed, mark the location on each shell with a felt tip pen,
and tape the two halves of each set together.
(14)
Remove the main bearing shells (19 and 20) from the cap (18), and the main bearing shells (22 and 23) from the
cylinder block (58).
b. Clean and Inspect.
(1)
Clean and inspect the crankshaft in accordance with paragraph 9-28.
(2)
Clean and inspect the connecting rod and main bearing shells in accordance with paragraphs 9-21 and 9-22.
c. Install.
CAUTION
Improper bearing shell Installation will cause severe engine damage. No.1 and No. 7 bearing
sets are 0.125 Inch (3.18 mm) narrower than bearing sets 2, 3, 4, 5, and 6 and must be installed
at the number 1 and 7 locations. Upper main bearIng shells (22 and 23, Figure 9-24) have
lubrication holes and grooves, and must be Installed In the cylinder block. Before Installing
bearing shells, clean all dirt and foreign matter from bearing shells, cylinder block, and
bearing caps. Even small amounts of foreign matter trapped between the lower bearing shell
and cap or between the upper bearing shell and cylinder block will reduce running clearance
and result in bearing failure .
(1)
Install the upper bearing shells (22 and 23) in the cylinder block (58). Be sure the bearing shells are firmly
seated in the bores, and the lubrication holes are aligned. Lubricate each bearing shell with a light coat of
lubricating oil, MIL-L-2104.
9-72
