TM 5-3895-359-14&P
4. Move the upper end of the lifting tool in and out to
2. Rest the ring gear on a flat metal surface and heat
loosen the flywheel, then withdraw the flywheel from the
the gear uniformly with an acetylene torch, keeping the
crankshaft and the flywheel housing.
torch moving around the gear to avoid hot spots.
5. Remove the clutch pilot bearing, as outlined on Page
CAUTION
Do not, under any circumstances,
NOTE
heat the gear over 400F (204C);
It is not necessary to remove the
excessive heat may destroy the
split type tube retainer.
original heat treatment.
NOTE
Inspection
Heat indicating "crayons", which are
Check the clutch contact face of the flywheel for
placed on the ring gear and melt at a
scoring, overheating or cracks. If scored, the flywheel
predetermined temperature, may be
may be refaced. However, do not remove more than
obtained from most tool vendors.
.020" of metal from the flywheel. Maintain all of the
Use of these "crayons" will ensure
radii when refacing the flywheel.
against overheating the gear.
3. Use a pair of tongs to place the gear on the flywheel
Replace the ring gear if the gear teeth are excessively
with the chamfer, if any, facing the same direction as on
worn or damaged. Check the butt end of the crankshaft
the gear just removed.
and flywheel contact surface. If necessary lightly stone
4. Tap the gear in place against the shoulder on the
the crankshaft end and the flywheel contact surface to
flywheel. If the gear cannot be tapped into place readily
remove any fretting or brinnelling.
so that it is seated all the way around, remove it and
apply additional heat, noting the above caution.
Be sure and check the crankshaft dowel extension.
Dowels must not extend more than 1/2" (13 mm) from
Install Flywheel
the crankshaft.
1. Attach the flywheel lifting tool and, using a chain
hoist, position the flywheel in the flywheel housing
Make sure that the crankshaft and flywheel contact
(use guide studs). Align the flywheel bolt holes with
surfaces and the bolt threads in the crankshaft end are
the crankshaft bolt holes.
clean and dry, to insure proper metal-to-metal contact
2. Install the clutch pilot bearing.
and maximum friction, before attaching the flywheel.
3. To install a split tube type retainer, (if removed),
New bolts should be used to mount or remount the
drive the retainer in flush with the end of the crankshaft
flywheel. However, if the original bolts are determined
with a soft hammer.
to be serviceable and are to be reused, clean them
CAUTION
thoroughly before starting the assembly procedure.
Do not mar the bearing contact
surface of the retainer.
Remove Ring Gear
4. Install two bolts through the scuff plate (or drive
Note whether the ring gear teeth are chamfered. The
flange) 180 from each other. Snug the bolts to hold the
replacement gear must be installed so that the chamfer
flywheel and scuff plate to the crankshaft. Remove the
on the teeth faces the same direction with relationship to
guide studs.
the flywheel as on the gear that is to be removed.
5. Remove the flywheel lifting tool.
Then remove the ring gear as follows:
6. Apply International Compound No. 2, or equivalent,
to the threads and to the bolt head contact area
1. Support the flywheel, crankshaft side down, on a
(underside) of the remaining bolts. The bolt threads
solid flat surface or hardwood block which is slightly
must be completely filled with International Compound
smaller than the inside diameter of the ring gear.
No. 2 and any excess wiped off.
2. Drive the ring gear off the flywheel with a suitable
NOTE
drift and hammer. Work around the circumference of
International Compound No. 2 must
the gear to avoid binding the gear on the flywheel.
never be used between two surfaces
where maximum friction is desired as
Install Ring Gear
between the crankshaft and the
1. Support the flywheel, ring gear side up, on a solid flat
flywheel.
surface.
7. Install the remaining bolts and run them in snug.
10-2-72
