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 damaging the crankshaft journals, do not use an unpadded chain or cable sling to
Install the crankshaft. Chain or cable slings should be padded with sections of coolant hose
of a suitable diameter. To prevent damage to bearlngs, the services of two technicians will be
required to guide the crankshaft squarely Into place.
(2)
Using a padded sling around a connecting rod journal near each end of crankshaft (32), lift the crankshaft with an
overhead hoist, and lower it squarely into place in the cylinder block (58). Guide the crankshaft on each end, and
ensure that it does not cock, and dislodge or damage the bearing shells during installation.
(3)
Install the thrust bearings (26) with the grooved surface facing the flange on the crankshaft (32). Do not install
the bearing retainer plate (25) at this time.
(4)
Install the lower bearing shells (19 and 20 ) in the main bearing caps (18). Be sure the bearing shells are firmly
seated in the caps.
5)
Check the main bearing clearance with Plastigage in accordance with paragraph 9-22.
CAUTION
Before Installing the main bearing capscrews (I6), washers (17), main bearing side-lock capscrews
(14), and lockwashers (15), coat the threads of the capscrews with clean engine lubricating oil,
MIL-L-2104, and coat the washers and underside of the bolt heads with SAE 140W lubricant, MIL-L-
2105. Failure to do so will result In improper torque and possible engine damage due to loosening
of the capscrews.
(6)
Lubricate the bearing shells (19 and 20) and crankshaft journals with a light coat of engine lubricating oil, MIL-L-
2104, and install the main bearing caps (18), washers (17), and capscrews (16). Tighten the capscrews to 120 to
130 pound-feet (162 to 176 newton-meters).
(7)
Lubricate and install the lockwashers (15) and side-lock capscrews (14), and tighten to 5 to 10 pound-feet (7 to
14 newton-meters).
NOTE
This is not the final torque on capscrews (16) and sidelock capscrews (14). Install all main
bearing caps and check the end clearance before tightening to final torque.
(8)
Check the crankshaft end clearance and correct if necessary, in accordance with paragraph 9-22.
(9)
Install the retainer plate (25) and secure it with capscrews (24). Tighten the capscrews to 20 to 25 pound-feet (27
to 34 newton-meters).
(10)
Torque the main bearing capscrews (16) and side-lock capscrews (14) in accordance with Table 9-4.
(11)
Install the connecting rod and piston assemblies in accordance with paragraph 9-20.
(12)
Install the flywheel housing and rear gear housing in accordance with paragraph 9-35.
(13)
Install the flywheel in accordance with paragraph 9-34.
(14)
Install the bearing gear housing and timing gears in accordance with paragraph 9-18.
(15)
Remove the engine from the rebuild stand and install it in the generator set in accordance with paragraph 2-15.
9-73
