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8-8
STARTING MOTOR-REDUCTION
GEAR
VIBRATES BACK AND
FORTH WHEN SWITCH
IS
ENGAGED
STARTER OPERATES
ENGAGE WHEN THE
SWITCH
IS
RELEASED
BUT WILL NOT
DIS-
IGNITION-STARTER
Condition
Possible Cause
Correction
SOLENOID PLUNGER
Battery low.
Faulty wiring.
Lead or connections broken inside solenoid
switch cover (brush holder plate) or open
hold-in winding.
Check for corrosion on solenoid contacts.
Broken solenoid plunger spring or spring out
of position.
Faulty ignition-starter switch.
Solenoid contact switch plunger stuck in
solenoid.
Insufficient clearance between winding leads
to solenoid terminal and main contactor in
solenoid.
Faulty relay.
Test for specific gravity
o f
the battery. Replace
or recharge the battery.
Test for loose connections at relay, ignition-
starter switch and solenoid.
Test and replace the solenoid
if
necessary.
Test and clean the contacts.
Test and repair.
Test and replace the switch if necessary.
Remove the contact switch plunger, wipe clean
of all
dirt,
place a film of SAE
10
oil on the
plunger, wipe off excess.
Test and repair.
Test and replace the relay if necessary.
STARTING MOTOR-REDUCTION
GEAR
in an aluminum die casting, Fig. 1. The starting motor
has an armature-to-engine
utilizes a solenoid shift device, the housing of the sole-
Description
The starting motor
crankshaft ratio of
45
to 1: a
3.5
to 1 reduction gear
set is built into the motor assembly, which is housed
noid is integral with the starting mot& drive end
housing.
SERVICE PROCEDURES
STARTER RESISTANCE AND
CURRENT DRAW TESTING
(1) Test the battery electrolyte specific gravity. Spe-
cific gravity should be 1.220 or above.
If
the battery
specific gravity is below 1.220, recharge the battery
to full charge before proceeding with the test.
(2)
Disconnect the positive battery lead from the
battery terminal post. Connect an
0
to
30
scale am-
meter between the disconnected lead and the battery
terminal post.
(3)
Connect a test voltmeter with 10 volt scale
di-
vision between the battery positive post and the start-
er switch terminal at the starter solenoid.
(4)
Crank the engine and observe the reading on
the voltmeter and ammeter. The voltage should not
exceed
.3
volt. A reading of voltage that exceeds
.3
volt indicates there is high resistance caused from
loose circuit connections, a faulty cable, burned start-
er relay or solenoid switch contacts.
A current that
is high and is combined with slow cranking speed, in-
dicates that the starter should be removed and re-
paired.
STARTER GROUND CIRCUIT TEST
(1) Connect the voltmeter positive lead to the
starter housing and the negative voltmeter lead to
the battery negative post.
(2) Crank the engine with a remote control starter
switch and observe the voltmeter reading. The volt-
meter reading should not exceed
.2
volt. A reading
of .2 volt or less indicates voltage in the ground cable
and connections is normal. If the voltmeter reading
is more than .2 volt,
it indicates excessive voltage
loss in the starter ground circuit. Make the following
tests to isolate the point of excessive voltage loss.
Repeating the test at each connection.
(a) Starter drive housing.
(b)
Cable terminal at the engine.
(c) Cable clamp at the battery.
A small change will occur each time a normal por-
tion of the circuit
is
removed from the test. A defi-
nite change in the voltmeter reading indicates that
the
last part eliminated in the test
is
at fault.
Maximum allowable voltage
loss is
as follows:
Battery ground cable .2 volt.
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