DETROIT DIESEL 53
1.7.7 Accessory Drive
Fig. 7 Former and Current Drive Plate Type
Fig. 8 Location of Oil Seal Spacer
CAUTION: When replacing the drive hub on the
from the bearing. Wipe the outside of the bearing
accessory shaft. drive the hub squarely on the
clean. then hold the inner race and revolve the outer
shaft (refer to Section 12.4).
race slowly by hand. If the bearing is worn or does not
roll freely. replace the hearing.
a. Place a new gasket on the flange and align the
holes in the gasket with the bolt holes in the
Inspect the accessory drive hub. shown in Fig. 5, for
flange. Use a light coat of grease to retain the
grooving at the area of contact with the lip of the oil
gasket in position.
seal. If the hub is grooved to a point where the
effectiveness of the oil seal IS lost, a ring type oil seal
b. Place the accessory in position against the flywheel
spacer is available which serves to reposition the seal,
housing, rotating it. if necessary. IO align the teeth
thus providing a new sealing surface for the lip of the
of the accessory hub with those in the drive
seal (Fig. 8).
coupling. Secure the accessory to the flywheel
housing with five bolts and lock washers.
Install Accessory Drive
4. If the accessory drive shown in Figs. 6 or 7 is used.
assemble as follows:
1. Remove old gasket material from the flywheel
housing. Use care so that no gasket material falls into
a. Install the accessory drive plate and spacer as
the gear train compartment.
outlined in Steps 1 and 2 above.
2. Insert a clean, lintless cloth in the flywheel housing
b. Place the drive shaft retainer on the bed of an
opening to prevent bolts from accidentally falling in
arbor press, with the mounting flange side up.
the gear train. Align the bolt holes in the accessory
Press the double row ball bearing straight in until
drive plate and spacer (if used), or the accessory drive
the bearing contacts the shoulder in the bore of
hub. with the tapped holes in the camshaft or balance
the retainer. Install the snap ring.
shaft gear. Then secure the plate and spacer, or drive
hub. with four bolts (and lock washers or lock wire, if
NOTE: On former accessory drives (Fig. 7).
used). Remove the cloth from the flywheel housing
install the bearing with the protruding face of
the inner race towards the retainer.
3. If a gear driven accessory is used as shown in
c. Turn the retainer over and press the oil seal into
Figs. 3 and 4. install the accessory drive coupling,
the bore of the retainer with the lip of the seal
toward the bearing.