1.4
Flywheel
DETROIT DIESEL 53
3. Use a pair of tongs to place the gear on the flywheel
Inspection
with the chamfer, if any. facing the same direction as
Check the clutch contact face of the flywheel for
on the gear just removed.
scoring, overheating or cracks. If scored, the flywheel
4. Tap the gear in place against the shoulder on the
may be refaced. However, do not remove more than
flywheel. If the gear cannot be tapped into place
.020" of metal from the flywheel. Maintain all of the
readily, remove it and apply additional heat, noting
radii when refacing the flywheel.
the above caution.
Although the flywheel seldom requires replacement,
the flywheel ring gear may become worn due to
normal usage or damaged by improper use of the
Install Flywheel
starting motor to the extent that it must be replaced. If
replacement of the ring gear is necessary, remove it as
outlined below.
2. If a clutch pilot bearing is used, install the bearing
Remove Ring Gear
as outlined in Section 1.4.1.
Note whether the ring gear teeth are chamfered. The
3. Install a new oil seal ring. if used.
replacement gear must be installed so that the chamfer
on the teeth faces the same direction with relationship
4. Attach flywheel lifting tool J 6361-01 to the flywheel
to the flywheel as on the gear that is to be removed.
with two 3/8"-16 bolts. Then, with the use of a chain
Then remove the ring gear as follows:
hoist. position the flywheel in the flywheel housing or
clutch housing.
the flywheel, crankshaft side down, on a
1. Support
solid flat surface or a hardwood block which is slightly
5. Apply a small quantity of International Compound
smaller than the inside diameter of the ring gear.
No. 2. or equivalent, to the threads and contact areas
of the six attaching bolts.
2. Drive the ring gear off the flywheel with a suitable
drift and hammer. Work around the circumference of
6. While holding the flywheel in place by hand,
the gear to avoid binding the gear on the flywheel.
remove the flywheel lifting tool and install the
flywheel attaching bolts and scuff plate. Tighten the
1/2 "-20 bolts on all engines
Install Ring Gear
to
110-120 lb-ft torque.
1. Support the flywheel, ring gear side up, on a solid
flat surface.
NOTE: Tighten the flywheel bolts accurately, but
do not exceed the specified torque. International
2. Rest the ring gear on a flat metal surface and heat
Compound No. 2 must never be used between
the gear uniformly with an acetylene torch, keeping
two surfaces where maximum friction is
the torch moving around the gear to avoid hot spots.
desired, such as between the crankshaft and the
flywheel.
CAUTION: Do not, under any circumstances,
heat the gear over 400F.; excessive heating
7. Mount a dial indicator on the flywheel housing or
may destroy the original heat treatment.
clutch housing and check the runout of the flywheel at
NOTE: Heat indicating "crayons", which are
the clutch contact face. Maximum allowable runout is
placed on the ring gear and melt at a pre-
.001"total indicator reading per inch of radius (the
determined temperature. may be obtained from
radius is measured from the center of the flywheel to
most tool vendors. Use of these "crayons" will
the outer edge of the clutch contact face of the
ensure against overheating the gear.
flywheel).
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