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ELECTRICAL SYSTEMS
CRANKING SYSTEM
10-37
SECTION 10-E
CRANKING (STARTER) SYSTEM
•
CONTENTS OF SECTION 1O-E
Paragraph
Subject
Page
Paragraph
Subject
Page
10-31
The Cranking (Starter)
10-37
Voltage Text of Cranking
System
.
.
. . . .
. . . .
. .. . .
.
..
10-37
Motor and Solenoid Switch
10-49
10-32
Accelerator Vacuum Switch-
10-38
Test and Adjustment of Sole-
On Carter Carburetor
.
...
.
10-39
noid Switch Relay .
.. .
.
. . .
10-49
10-33
Acc
elerator
Vacuum Switch-
10-39
Solenoid Switch
Test
and Re-
On Stromberg Carburetor
.
.
10-42
pairs-Cranking Motor on
10-34
Neutral Safety Switch-
Bench
.
. ..
.
.
.
..
.
. .
.
.
.
.
. .
.
10-51
Dynaflow Drive .
..
.
. .
. .
.
.
10-45
10-40
Bench Test of Cranking Motor
10-52
10-35
Cranking Motor Assembly
..
.
10-46
10-41
Cranking Motor Repairs-On
10-36
Periodic Inspection of Crank-
Bench
.
..
..
..
.. ..
.
. . .
. .
.
.
10-53
ing Motor .
.. ... . .....
. . .
10-48
SERVICE BULLETIN REFERENCE
Bulletin No.
Page No
.
SUBJECT
10-31 THE CRANKING (STARTER)
SYSTEM
a. General Description
The Buick cranking system permits the en-
gine to be cranked and started automatically,
after the ignition has been turned on
,
by press-
ing down on the accelerator pedal. The crank-
ing motor circuit is automatically opened and
the
cranking motor is
disengaged
from the fly-
wheel ring gear as soon as the engine starts
running and
the
acc
elerator
pedal is
released.
The units comprising the cranking system
(fig. 10-32)
are
as follows:
1.
Battery and battery cables (par. 10-14)
.
2. Cranking motor, including the drive as-
sembly which engages the flywheel ring gear
during cranking operation (par. 10-35).
3. Cranking motor
solenoid switch,
mounted
on cr a n king
motor,
f
or
shifting drive assembly
and
closing the mot or
circ ui t.
The
switch in-
cludes a
relay
f
or
ope rat ing
the solenoid (par.
10-35) .
4.
Accelerator vacuum switch, mounted on
the carburetor and operated by both the throttle
shaft and engine vacuum. This switch permits
control of cranking system by the accelerator
pedal (par. 10-32 and 10-33).
5. Generator windings, which are used for
completing the vacuum switch and solenoid re-
lay magnet coil
circuit
to ground,
6. Charge
indicator,
ignition switch, and
necessary wiring to connect
the
various units.
7. N
eutral safety sw itch,
only on cars
equipped with Dynafiow Drive. This switch is
connected in
series
with the solenoid switch
relay to
prevent
cranking of engine except
when the transmission cont r ol lever is in either
the neutral (N) or parking (P) position.
b. Operation of Cranking System
After
the ignition
switch is
turned
on, the
cranking
system
is
set
in operation to start the
engine by
pressing
down on the accelerator
pedal. This causes the throttle to open and the
accelerator vacuum switch contacts to close,
thereby allowing current to flow from the bat-
t
ery
through
the
ignition switch, vacuum switch,
solenoid
switch r
ela y windings,
and g
enerator
windings t
o
g
r ound. See
figure 10-32. NOTE:
On
Dynafio w Driv e cars,
th
e transmission
con-
trol
lever must be
in n
eut ral
(N) or parking
(P) position so that
neutral
safety switch is
closed.
Completion of this control circuit causes the
solenoid switch relay cont a ct s to close. Current
from the battery
then
flows through the "pull-
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