1.4 Flywheel
DETROIT DIESEL 53
obtained from most tool vendors. Use
remove more than .020" of metal from the flywheel and
of one of these "crayons" will insure
maintain all radii when refacing the flywheel.
against overheating the gear.
The flywheel seldom wears to the point of requiring
3. Use a pair of tongs to place the gear on the
service or replacement. However, the flywheel ring gear
flywheel with the chamfer, if any, facing the same
may become worn due to normal usage or damage by
direction as on the gear just removed.
improper use of the starting motor to the extent that it
must be replaced. Examine the teeth on the ring gear.
4. Tap the gear in place against the shoulder on
If replacement is necessary, remove the ring gear as
the flywheel. If the gear cannot be tapped into place
outlined below.
readily, remove it and apply additional heat, heeding the
caution about overheating.
Remove Ring Gear from Flywheel
Install Flywheel
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.
Before removing the gear, note the chamfer, if any, on
the gear teeth so that the new gear may be installed in
the same position.
2. Drive the ring gear off of the flywheel with a
1. Mount the flywheel, using lifting tool J 6361-01
suitable drift and hammer.
Work around the
and a chain hoist, in position against the rear end of the
circumference of the ring gear to avoid binding the gear
crankshaft.
on the flywheel.
2. a small quantity of International Compound No.
Install Ring Gear on Flywheel
2, or equivalent, to the bolt threads and bolt head
contact areas of the flywheel attaching bolts.
1. Support the flywheel, ring gear side up, on a
solid flat surface.
3. While holding the flywheel in place by hand,
remove the flywheel lifting tool and install the flywheel
2. Rest the ring gear on a flat metal surface and
attaching bolts and scuff plate. Tighten the bolts on to
heat the gear uniformly with an acetylene torch, keeping
110-120 Ib ft torque.
the torch moving around the gear to avoid hot spots.
4. Mount a dial indicator on the flywheel housing
CAUTION : Do not, under any
and check the runout of the flywheel at the clutch
circumstances, heat the gear over
contact face. Maximum allowable runout is .001" total
400F.; excessive heating may destroy
indicator reading per inch of radius (the radius is
the original heat treatment.
measured from the center of the flywheel to the outer
edge of the clutch contact face of the flywheel).
NOTE: Heat indicating "crayons", which
are placed on the ring gear and melt at
a predetermined temperature, may be
1970 General Motors Corp.
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