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10-44
CRANKING
SYSTEM
ELECTRICAL SYSTEMS
(320)
b. Checking Switch Timing with Carburetor
Installed
on Engine
CAUTION: Before checking timing be sure
that transmission is in neutral and apply park-
ing brake.
1. Set engine
hot idle speed at 450 RPM
(8 MPH).
2. With engine not running insert #65
drill or wire (small size paper clip) through
center of screen to operate vacuum piston. DO
NOT REMOVE SCREEN. See figure 10-46.
3. With throttle closed, first push vacuum
piston to its inner position and hold it there
while opening throttle. This will allow slide to
drop into the shallow groove in the piston and
will lock it in the inner position and prevent
slide from dropping far enough to complete
contact. See figure 10-46. Hold throttle open to
prevent release of piston until completion of
Steps 4 and 5. Remove drill or wire.
INSERT 5/
64
'
&
3-134'
SPACERS HERE
COLD IDLE
~~~:w
I
IDLE
STOP
n
..; ..r, "f J
'
Figure 10-47-Spacer Between Idle Stop Screw and Fast Idle Cam
4. Place
%/'
spacer between idle stop screw
and fast idle cam while holding fast idle cam
in extreme cold idle position. Close throttle so
that spacer will hold cam in this position. See
figure 10-47. Turn ignition on, hold spacer and
open throttle. Engine should not crank.
NOTE: A test light with a battery may be
used in series with switch instead of turning
on ignition.
5. Still holding throttle open, place
%4"
spacer between idle stop screw and fast idle
cam while holding fast idle cam in extreme cold
idle position. Close throttle so that spacer will
hold cam in this position (fig. 10-47) and again
open throttle with ignition on. Engine should
crank.
6.
If the
%4"
spacer causes the engine
to
crank, bend tang on operating lever downward.
If the
%4"
spacer does not cause engine
to
crank, bend tang on lever upward. In making
either adjustment bend tang on operating lever
only a slight amount each time until, by re-
checking with the above procedure, the speci-
fied spacing is obtained.
Figure 10-4B-Setting Switch Timing with Carburetor Removed
c. Setting Switch Timing with Carburetor
Removed from Engine
If the carburetor has been removed from the
engine an approximate switch timing setting
may be made as follows:
1.
On Series 40-50, place a .075" to .085"
drill (#45 to #48) between throttle valve and
carburetor barrel. On
Series
70, use a .090" to
.100" drill (#39 to #42). Close throttle to hold
drill in position.
2. Bend tang on switch operating lever un-
til it just touches switch slide. See figure 10-48.
3. After carburetor is installed on engine,
always recheck switch timing as described in
subparagraph
b
above.
d. Cleaning and Lubricating Switch
The accelerator vacuum switch may be re-
moved for cleaning or r
eplacement
of parts
without removing the carburetor. Disconnect
wires and remove two screws which attach
switch to the t
hrottle
body of carburetor.
The switch may be readily disassembled by
referring to figure 10-42. Wash all metal parts
in white gasoline and wipe
dry.
Do not soak
bakelite parts in cleaning
solution,
but wipe
with a clean cloth.
Lubrication of switch contacts is unnecessary
unless parts have been cleaned or replaced, in
which case the inside surface of the terminal
cap should be given alight coating of Beacon
M-285 lubricant which is available in small
tubes at authorized Stromberg Carburetor Serv-
~
,
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