Advertisement
(32
1)
ELECTRICAL SYSTEMS
CRANKING
SYSTEM
10-45
ice
Stations.
If
this lubricant is not available
petroleum
jelly
may
be used. Lubricant should
be applied sparingly by working into a clean
cloth and lightly swabbing the inside surface
of
terminal cap.
CAUTION
:
Never us
e
ordinary
lub ricants,
as poor switch contact will
be
ob-
tained
in cold weather. N
ev er
apply lubricant
to slide
or
piston.
When switch is reassembled observe the fol-
lowing points:
1.
Make certain that the contact guide
spring and the va
cuum
piston spring are in-
stalled in their
proper positions.
The contact
guide spring may
be
identified
as the heavier
of the two springs. See figure
10-42.
2.
Make certain that piston is installed
with the end having the deep groove and
tapered counterbore nearest the seal.
3.
Use
care
in handling the U-shaped con-
tact spring to avoid
altering
the
dimension
of
the open
end.
The
open end measures
0/16"
from
outside
to
outside
of
the
curved ends of spring.
See
figure 10-42
.
4. Make certain that the narrow proj
ection
on t
op
of slide is
properly
entered in
the
slot
in bottom of contact
guide.
When switch is reinstalled on carburetor use
a
new
gasket to
insure
a vacuum-tight
seal.
Check
and
set
switch
timing as described in
subparagraph
b
above.
10 - 34 NEUTRAL SAFETY SWITCH
-
DYNAFLOW
DRIVE
CARS
a
.
De scription
Dynaflow Drive cars are provided with a
neutral safety switch which
prevent s
operation
of the
cranking
motor except when the trans-
mission is in
t
he Neutral (N) or Park (P)
positions. This switch is a safety feature in-
st alled
for the purpose of preventing car
motion
when
starting the
engine.
The neutral safety sw
itch
is connected in
series with the
cranking
mot or control circuit,
in the line between the ignition switch and the
acc
elerator
vacuum
switch.
It
is mounted at
the
lower
end of
the steering
gear column
jacket
and is
operated by t
he
lever
at
lower
end of
the transmission cont ro l shaft.
It
is
important
that the neutral safety switch
be
maintained
in proper
adjustment,
as de-
sc
r ibed in subparagraph
b, below.
b. Checking Neutral Safety Switch
Adjustment
When properly
adjusted,
the
n
eutral saf et y
switch will allow
the
cranking motor control
circuit to
remain closed
until the shift control
lever
is moved out of Neutral (N) toward Park
(P) far enough to
move outer
end of control
lever
pointer
%2".
If
pointer
travel
from "N"
to point
where
the switch opens the circuit is
less than
Va",
failure to obtain cranking in
neutral may result. If
pointer
travel is more
than
%6'"
cranking may be obtained with shift
leve
r
in Drive (D) position, resulting in car
movement during cranking.
Figure 10
-49-Marking
Switch Cut-in Limits on
Shift Control
Window
Use the
following
procedure to
determine
whether
neutral
sa
f ety
switc h operates within
the
required limits.
1.
Ground
the
primary terminal of distrib-
utor with jumper wi
re
so that engine can be
cranked without firing.
2.
Firmly
engage "step-on"
parking brake
and place
transmission
shift control
lever
in
Neutral
(N), making
certain
that stop is in
shift detent.
3. Place a narrow strip of masking tape
on shift control window so that tip of control
lever pointer
is visible. Make two marks
on
masking tape at
Va"
and
%6"
from
ri{1ht
edge
of pointer. See figu r e 10-49.
4.
Move shift
control lever to Drive (D)
position, t
ur n
ignition
on and depress acceler-
ator pedal.
5.
Slowly move shift control lever pointer
from "D" toward "N", and note position of
right edge of pointer at instant that
cranking
motor starts to operate. This should be between
the
Va"
and
71
6" marks on
masking
tape. See
figure 10-50.
Advertisement
