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10-50
CRANKING SYSTEM
ELECTRICAL SYSTEMS
(326)
available. Test equipment consists of an ac-
curate low reading voltmeter and a variable
rheostat of at least 10 ohm having a capacity
for 2 amperes.
Figure IO-57-Connections for Testing Cut-in and Cut-out Voltages
of Solenoid Switch Relay
a. Testing Solenoid Switch Relay Cut-in and
Cut-out Voltages
Solenoid switch relay cut-in and cut-out volt-
ages may be determined with cranking motor
installed and without removing switch cover
as follows:
1.
Make sure that ignition switch' is turned
off.
2. Set rheostat to provide full resistance.
Connect one lead of rheostat to battery ter-
minal on solenoid switch, and connect other
lead to terminal on solenoid switch relay which
has white wire with black parallel tracers con-
nected to it. This wire is connected to the ac-
celerator vacuum
switch.
See figure 10-57.
3. Connect voltmeter leads to both relay
terminals.
4. Turn rheostat to slowly decrease resist-
ance until engine just starts to crank and note
voltmeter reading at this cut-in point. Reading
should be between 1.2 and 1.8 volts.
5. Quickly turn rheostat until all resistance
is cut out and full voltage is applied to the re-
lay to fully saturate the magnet core.
6. As quickly as possible, increase resist-
ance until motor discontinues cranking, and
note voltmeter reading at the cut-out point.
This should be not less than .6
volt.
7.
If
solenoid relay does not operate with-
in the voltage limits specified, it must be ad-
justed (subpar.
b,
below).
b. Solenoid Switch Relay Adjustments
When the solenoid switch relay does not op-
erate within the voltage limits specified in sub-
paragraph a above, five checks and adjustments
must be made in the following order: Air gap,
contact point opening, closing voltage, sealing
voltage and opening voltage. This work cannot
be properly done with cranking motor installed
on engine.
PO INTS JUST
TOUCHING
AIR GAP
.0 15"
Figure la-Sa-Relay Air Gap Adlustment
.
1.
Remove cranking motor from engine and
remove switch cover.
2. Push relay armature down until contact
points just touch, then check air gap between
armature and end of core
,
using .015" feeler
gauge. Air gap should be not less than .015".
Adjust gap to .015, if necessary, by bending
the lower point
support.
See figure
10-58.
3. With armature free, check contact point
'opening, using .025" feeler gauge. Adjust point
opening to .025", if necessary, by bending the
upper armature
stop.
See figure
10-59.
4. Connect a 6-volt battery and the 10 ohm
rheostat in series between the relay terminals.
Connect the low reading voltmeter between the
relay terminals.
5. Slowly adjust rheostat to increase volt-
age until contact points close and note voltage.
Closing voltage should be 1.2 to 1.8 volts.
If
not
within these limits, bend armature spring post
down to increase spring tension and closing
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