.
INSERT #43 DRILL
IN NOTCH
LOOSEN
CLAMP BOLT
TO AD&
CONTROLLER LEAD(S)-
A?V An\ - ---- -- -_- -- ,-,
*(SIkLE OR DOUBLE
WmE UNIT USED--
NOT INZZRC'KAIVGEABLE)
LEVER UP TO
#EASE CHOKE
UP -
INCREASE
DOWN -
DECREASE
FOR ADJUSTING
KE CROSS SHAFT
BASE OF CHOKE BODY
-_a._-- 1 m .__..__A. _ .AA ..L. -_a _L - - ~ -
FIGURE 4-6 -- MANIFOLD MOUNTED TYPE AUTOMATIC CHOKE
AUTOMATIC CHOKES
.
Two different electric
- thermostatic type automatic chokes are used. One type is an integral
part of the carburetor while the other type is mounted on the exhaust manifold and connected through
external linkage to the choke plate in carburetor.
The electrical leads to the choke are connected so
that current flows to the thermostatic element only when the ignition is turned on.
Tension of the
thermostatic spring is set to atlow full choke at starting.
On manifold type, heat from the manifold con-
trols tension of the thermostat spring which causes the choke plate to be gradually returned to the open
position as the engine warms up.
On carburetor units,
vacuum from intake manifold pulls the choke
open. Chokes are adjusted in the factory, however,
slight readjustment may be necessary initially to
account for different starting conditions.
Adjust chokes as foUows:
Carburetor Unit:
Choke unit is set for average conditions.
To readjust,
loosen three screws on outside
of cover plate then shift cover in clockwise direction (arrow) for richer setting or in counterclockwise
direction for leaner setting.
Tighten cover screws after final adjustment.
Exhaust Manifold Mounted Unit:
Remove air cleaner from carburetor to observe position of choke plate.
aoke adjustment must be made on cold engine.
If starting in extreme cold, choke should be in full
closed position before engine is started.
A lesser degree of choking is needed in milder temperatures.
.
If adjustment is needed, proceed as follows:
7.
Move choke.arm until hole in brass shaft lines up with slot in bearings.
2. Insert #43 dri 11 ( l 089) and push al 1 the way down to engine manifold
to engage in notch in base of choke unit.
3. Loosen clamp bolt on choke lever, push arm upward to move choke plate toward closed
* position.
After desired position is attained, tighten clamp bolt then remove dri'll.
SPRiNG
PLACEMENT
WRONG
RI &IT
I
I
1.-~~~~~~~-~~~~-----~~
INITIAL SETTING
ON CENTER NOTCH
INTAKE MAN I FOLD
-- _ -
FIGURE 4-7 --
_ _-
CARBURETOR MOUNTED TYPE AUTOMATIC CHOKE
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