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TM5-4210-229-14&P
6-13. FLYWHEEL, CRANKSHAFT, AND MAIN BEARING MAINTENANCE (Continued).
This task cover: a. Removal
b. Inspection
c. Installation
INITIAL SET-UP
Tools
Rockwell Hardness Tester
Pilot Driver
General Mechanics Tool Kit
Hoist/ Sling
Micrometer
Wire Brush
Equipment Condition
Para.
Condition Description
4-92
Oil Pan Removed
6-6
Cylinder Head and Valves Removed
6-10
Timing and Gear Train Removed
6-11
Oil Pump Removed
Materials/Parts
Flywheel (683961C91)
Ring Gear (61544H)
Crankshaft Bearings (684570C92)
Crankshaft (681319C92)
Cleaning Solvent (Appendix D, item 54)
Lubricating Oil (Appendix D, Item 37)
Bluing Ink (Appendix D, Item 23)
Lint-Free Cloth (Appendix D, Item 14)
Plastigage (Appendix D, Item 40a)
a. Remove flywheel bolts. Pull off flywheel with
ring gear. Support the flywheel so as not to
damage the crankshaft dowel pin.
b. Crankshaft bearings removal.
(1) Remove the capscrews securing the crank-
shaft bearing caps.
(2) Tap the caps lightly with a soft metal ham-
mer or mallet to loosen them, then remove
lower bearings.
(a) If the bearings are to be reused, iden-
tify each bearing as to its original
position.
(b) Remove the lower bearing from the caps.
(c) Wrap the pieces in a clean cloth and
store them until reassembly.
NOTE
If the crankshaft is to be removed, disregard
step 3.
(3) Remove the upper bearing halves as
described in methods (a) or (b).
(a) Insert a thin piece of flexible soft metal
between the crankshaft and crankcase.
This will push against the end of the
bearing furthest from the nib holding
the bearing in the crankcase support.
Simultaneously, turn the crankshaft in
the direction of rotation. This will
cause the bearing to slide easily from
position.
(b) An alternate method of removing up-
per bearing halves is to hammer the
closed end of a small cotter pin to form
a T.
(c) Insert the prongs of the cotter pin into
the oil hole of the crankshaft journal
with the flattened head just protruding.
Rotate the crankshaft and the cotter
pin head will push the bearing from
position.
c. Crankshaft removal.
When lifting an object, make sure the hoist and
sling are fastened securely. Be sure the item
being lifted does not exceed the capacity of the
lifting device.
6-36
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