TM 5-3810-206-35
reversing procedure in steps (1) through (9) above.
Note. Torque main bearing cap nuts
to 155 ft-lbs, and pulley retaining bolt
to between 210 and 250 ft-lbs.
b. Cleaning, Inspection, and Repair.
(1) Clean all pa rts and dry thoroughly before
inspection or installation.
(2) Inspect crankshaft for cracks and scored or
worn journals. If the crankshaft is scored; has a main
journal worn in excess of 0.005 inch; has a rod journal
worn in excess of 0.004 inch, or has a rod journal out-of-
round in excess of 0.002 inch, it will be rehabilitated (
c
below) or replaced. Main journal diameter is 3.499 to
3.500 inch and rod journal diameter is 2.999 to 3.000
inch, when new. A cracked or bent crankshaft will be
replaced.
(3) Inspect main bearings for scoring, damage,
or wear. Main bearings have a specified clearance of
between 0.0030 and 0.0059 inch. Replace bearings in
sets of seven when clearance on any one bearing
measures in excess of 0.008 inch. Replace scored or
damaged bearings.
(4) The specified crankshaft end clearance is
between 0.011 and 0.018 inches. Replace the thrust
bearing (rear lower flanged half (7) fig. 3-66), when end
clearance measures in excess of 0.027 inch, then
recheck the clearance.
c. Crankshaft Rehabilitation.
(1) Crankshaft journals will be rehabilitated by
the metalizing, chromeplating, or submerged arc welding
process and finished to the original dimensions. Method
of rehabilitation will be determined by authorized
inspection personnel after considering cost, availability
of facilities, and serviceability of method.
(2) Specifications and procedures pertaining to
the specific process utilized shall conform to standard
KEY to fig. 3-66:
commercial practices in accordance with instructions
1
Cotterpins (14 rqr)
10
Key
issued by the applicable crankshaft repair equipment
2
Nut (14 rqr)
11
Crankshaft
manufacturer.
3
Bearing cap
12
Upper bearing halves
4
Bearing cap
(7 rqr)
Note. Always install bearing caps in
5
Bearing cap
13
Stud
proper location with part numbers
6
Crankcase
14
Stud
7
Rear lower bearing half
15
Sleeve
facing toward front of block. Install
8
Lower bearing halves
16
Packing
new bearing halves in main and
(6 rqr)
17
Dowel pin
connecting rod bearings when a new
9
Crankshaft gear
or
rehabilitated
crankshaft
is
installed.
Figure 3-66. Crankshaft and main bearings for engine
model D333TA, exploded view.
Section XVIII. ENGINE CRANKCASE
coolant passages essential to engine performance. The
3-62. General
major difference being arrangement for inlet air and
The crankcase of engines used on this crane shovel unit
coolant distribution, and placement of the timing gear
differ in configuration, but are east to contain oil and
group.
3-79
