DETROIT DIESEL 53
1.4
FLYWHEEL
The flywheel is attached to the rear end of the crankshaft with six self-locking bolts. A scuff plate is used between the
flywheel and the bolt heads to prevent the bolt heads from scoring the flywheel surface.
A steel ring gear, which meshes with the starting motor pinion, is shrunk onto the rim of the flywheel. The flywheel is
machined to provide true alignment with the clutch or a power take-off driving ring, and the center bore provides for
installation of a clutch pilot bearing. The clutch or power take-off driving ring is bolted to the flywheel.
An oil seal ring, which provides an oil tight connection between the crankshaft and the flywheel, is fitted into a groove on
flywheels used with hydraulic couplings, clutches or Torqmatic converters.
The flywheel must be removed for service operations such as replacing the starter ring gear, crankshaft or flywheel
housing. On torque converter units, the flywheel is part of the torque converter assembly and is covered in the applicable
converter service manual.
Remove Flywheel (Transmission Removed)
1. If a clutch housing is attached to the flywheel housing,
remove the flywheel as follows:
a.
Remove the flywheel attaching bolts and the
scuff plate.
b.
Lift the flywheel off the end of the crankshaft and
out of the clutch housing.
2. If a clutch housing isn't used, remove the flywheel as
follows:
a.
Remove the flywheel attaching bolts and the
scuff plate while holding the flywheel in position
by hand, then reinstall one bolt.
CAUTION: When removing or installing the attaching
bolts, hold the flywheel firmly against the crankshaft
by hand to prevent it from slipping off the end of the
crankshaft. The flywheel is NOT doweled to the
crankshaft.
b.
Attach flywheel lifting tool J 6361-01 to the
flywheel with two 3/8 "-16 bolts of suitable length
as shown in Fig. 1.
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 Section 1.4.1.
g.
Remove the oil seal ring, if used.
Fig. 1 - Removing Flywheel
November, 1973
SEC. 1.4
Page 1
