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