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 TM 55-1905-223-24-3
NOTE
If the ring gear teeth are cracked or broken, the ring gear must be replaced.
e.
Inspect the flywheel housing (1).
(1)
Use solvent to clean the housing.
(2)
Visually inspect all surfaces for nicks, burrs, or cracks.
(3)
Use a fine crocus cloth to remove small nicks and burrs.
f.
Flywheel spur gear replacement (14).
(1)
Remove the spur gear (14) from the engine flywheel as follows.
CAUTION
Do not use a cutting torch to heat the spur gear.
The flywheel can be
damaged. Use a heating torch to heat the ring gear.
(a) Heat the outside diameter of the spur gear (14).
(b) Use a blunt chisel and a hammer to remove the gear from the flywheel (13).
(2)
Install a new spur gear (14) on the flywheel (13):
(a) Heat the gear to 600 (316 ) for a minimum of 1 hour. Use a heat determining crayon, or
F
C
equivalent, to check the gear temperature before installing it on the flywheel.
NOTE
Do not overheat the spur gear. The metal hardness will be changed.
WARNING
Wear protective gloves to prevent personal injury when handling parts that
have been heated.
(b) Install the spur gear (14) on the flywheel (13) immediately after heating.
g.
Install the mechanical drive (flywheel) housing (1). Refer to paragraph 3-24.
h.
Install and adjust the magnetic pickup (17) (paragraph 3-24).
4-88
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