TM 5-3895-346-14
FLYWHEEL
ENGINE OVERHAUL
c.
Attach a chain hoist to the lifting tool.
d.
Remove the remaining flywheel attaching bolt.
e.
Move the upper end of the lifting tool in and out to loosen the flywheel, then withdraw the flywheel
from the crankshaft and the flywheel housing.
f.
Remove the clutch pilot bearing, if used, as outlined in Clutch Pilot Bearing.
g.
Remove the oil seal ring, if used.
Inspection
Check the clutch contact face of the flywheel for scoring, overheating, or cracks. If scored, the flywheel may be
refaced. However, DO NOT remove more than 0.020 inch of metal from the flywheel. Maintain all of the radii
when refacing the flywheel.
Replace the ring gear if the gear teeth are excessively worn or damaged.
Check the butt end of the crankshaft and flywheel contact surface. If necessary, lightly stone the crankshaft end
and the flywheel contact surface to remove any fretting or brinnelling.
On crankshafts with dowels, be sure to check the dowel extension. Dowels must not extend more than 1/2 inch
(13 mm) from the crankshaft.
Make sure that the crankshaft and fly-wheel contact surfaces and the bolt threads in the crankshaft end are
clean and dry, to ensure proper metal-to- metal contact and maximum friction, before attaching the flywheel.
New bolts should be used to mount or remount the flywheel. However, if the original bolts are determined to be
serviceable and are to be reused, clean them thoroughly before starting the assembly procedure.
Remove Ring Gear
Note whether the ring gear teeth are chamfered. The replacement gear must be installed so that the chamfer
on the teeth faces the same direction with relationship to the flywheel as on the gear that is to be removed.
Then remove the ring gear as follows:
1.
Support the flywheel, crankshaft side down, on a solid flat surface or a hardwood block which is
slightly smaller than the inside diameter of the ring gear.
2.
Drive the ring gear off the flywheel with a suitable drift and hammer. Work around the
circumference of the gear to avoid binding the gear on the flywheel.
3.
If a clutch pilot bearing is used, inspect the bearing and replace it, if necessary.
Install Ring Gear
1.
Support the flywheel, ring gear side up, on a solid flat surface.
2.
Rest the ring gear on a flat metal surface and heat the gear uniformly with an acetylene torch,
keeping the torch moving around the gear to avoid hot spots.
CAUTION
Do not, under any circumstances, heat the gear over 400 (204 ); excessive
F
C
heat may destroy the original heat treatment.
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