AUTOMATIC CHOKES
Two different electric
-
thermostatic type automatic chokes are used on the
K662
models.
One
type is an integral part of a special down draft carburetor while the other type is mounted on the
exhaust manifold and connected through external linkage to the choke plate in carhuretor.
Both types operate on the same basic principles.
The electrical lead to the choke is connected
so that current flows to the thermostatic element only when the ignition is turned on.
Tension of the
thermostatic
spring is set to allow full choke at starting.
Current through a heating element furnishes
heat to control tension of the
termostatic spring which causes the choke plate to be gradually returned
to the open position as the engine warms up.
The automatic chokes are adjusted in the factory, however, slight readjustment may
be
neces
sary initially to accommodate different starting conditions. Adjust chokes as follows:
Carburetor Unit:
Choke unit is set for average conditions. To readjust to local starting conditions,
loosen screws on outside of cover plate then shift cover in clockwise direction (arrow) for richer set
-
ting 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. Choke 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 tempera
-
tures. If adjustment is needed, proceed as follows:
1.
Move choke arm until hole in brass shaft lines up with slot in bearings.
2.
Insert #43 drill
(.
089) and push all the way dawn to engine manifold to engage in notch in
base of choke unit
(See
Figure 4-9B).
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 drill.
4.
After replacing air cleaner, check for evidence of binding in linkage
--
correct if necessary.
Be
sure chokes are fully open when engine is at normal operating temperature.
I
ELECTR1,CAL TERMINAL
CHOKE LEVER ARM
.
'NOTCH
I
N
BASE
I
A
I
I
I
B
FIGURE
4
-
9
--
AUTOMATIC CHOKES
(A)
CARBURETOR UNIT
--
(B) MANIFOLD UNIT
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