DETROIT DIESEL 53
Starting Motor 7.3
1. Remove the ground strap or cable from the battery
Lubrication
or the cable from the starting motor solenoid. Tape
the end of the cable to prevent discharging the battery
The starting motor bearings (bushings) are lubricated
from a direct short.
by oil saturated wicks which project through each
bronze bushing (one at each end and one at the
2. Disconnect the starting motor cables and solenoid
center) and contact the armature shaft. Oil can be
wiring.
added to each wick by removing a pipe plug which is
accessible on the outside of the motor (refer to
NOTE: Tag each lead to ensure correct
Section 15.1).
connections when the starting motor is
reinstalled.
Flywheel Ring Gears
3. Support the motor and remove the three bolts and
lock washers which secure it to the flywheel housing.
The starting motor drive pinion and the engine
Then pull the motor forward to remove it from the
flywheel ring gear must be matched to provide positive
flywheel housing.
engagement and to avoid clashing of the gear teeth.
Flywheel ring gear teeth have either no chamfer or a
Check the starting motor, if required, in accordance
Bendix chamfer. The Sprag clutch cannot be used with
with the Delco-Remy "Cranking Circuit" maintenance
a ring gear with a Dyer chamfer.
handbook.
Remove Starting Motor
Install Starting Motor
Failure of the starting motor to crank the engine at
To install the starting motor, reverse the procedure
normal cranking speed may be due to a defective
outlined for removal. Tighten the 5/8"-11 starter
battery, worn battery cables, poor connections in the
attaching bolts to 137-147 lb-ft torque.
cranking circuit, defective engine starting switch, low
Keep all of the electrical connections clean and tight.
temperature, condition of the engine or a defective
When installing wiring terminal leads to the starting
starting motor.
motor and the solenoid switch, tighten the No. 10-32
connections to 16-30 lb-in torque and the 1/2" x 13
If the engine, battery and cranking circuit are in good
condition, remove the starting motor as follows:
connections to 20-25 lb-ft torque.
November, 1973
SEC. 7.3 Page 3
