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CARBURETOR-AFB
14-65
made on the vehicle, as described in the Fast Idle
Speed adjustment (On the Vehicle Paragraph.) How-
ever, the fast Idle Cam Position Adjustment can be
made on the bench.
This adjustment is important to assure that the
speeds of each cam step occur at the proper time dur-
ing engine warm-up. Adjust as follows:
(1) With the fast idle speed adjusting screw con-
tacting the step on the fast idle cam, shown in (Fig.
13), move the choke valve toward the closed position
with light pressure. Insert a NO. 50 drill between the
choke valve and the wall of the air horn.
(2) An adjustment will be necessary if a slight drag
is not obtained as the drill is being removed.
(3) If an adjustment is necessary, bend the fast idle
connector rod at the angle, using Tool T109-213 until
the correct valve opening has been obtained. Refer
to (Fig. 13).
Vacuum
Kick
Adjustment
Uhis
test can be made
ON
or
OFF
the
vehicle
.J
The choke diaphragm adjustment controls the fuel
delivery while the engine is running. It positions the
choke valve within the air horn by action of the link-
age between the choke shaft and the diaphragm. The
diaphragm must be energized to measure the vacuum
kick adjustment. Use either a distributor test machine
with a vacuum source, or vacuum supplied by another
vehicle.
(1)
With the engine
Not
running, open the throttle
valves far enough to allow the choke valve to be
moved to the closed position.
(2) Disconnect the vacuum hose from the dia-
~
"z
DRILL O R GAUGE
CLOSING PRESSURE ON
CHOKE SHAFT LEVER
KE LEVER SLOT
MINIMUM OF
10 INCHES
O F
VACUUM ON
DIAPHRAGM
,TO VACUUM
VACUUM CHOKE
TUBE
FITTING
NK595
Fig. 14-Measuring
the Choke Vacuum Kick Setting
CHOKE OPERATING LINK
N K596
Fig. 15-Choke
Operating Link Measurement
phragm and connect the hose from the vacuum sup-
ply, as shown in (Fig. 14). (A minimum of 10 inches
of mercury (HG) will be required.
(3) Insert the specified drill between the choke
valve and the wall of the air horn. Refer to (Fig. 14).
Apply sufficient closing pressure on the choke shaft
lever to provide the smallest choke valve opening pos-
sible without distortion of the diaphragm link. Note
that the cylindrical stem of the diaphragm will extend
as an internal spring is compressed. The spring must
be fully compressed for proper measurement of the
kick adjustment.
(4) An adjustment will be necessary
if
a slight drag
is not obtained as the drill or gauge is being removed.
The adjustment of this opening will require the
re-
moval of the choke operating link.
CAUTION: Damage to the diaphragm and the choke
lever slot can result, if the link is not removed for
the bending operation.
(5) Remove the clip and disengage the choke op-
erating link from the choke lever, then disengage the
link from the diaphragm stem. (The best bending
results will be obtained by using a vise and
a
pair of
pliers.)
(6)
Bend the choke operating link to provide the
correct choke valve opening.
CAUTION: A correction in the length of the link
of .015 inch, will result in a change of
.010
inch in
the choke valve opening.
As an example, if the choke valve opening is .010
inch in error, the correction in the link length would
be .015.
A
2"
micrometer will be helpful in establishing the
original length of the link, as shown in (Fig. 15), be-
fore completing the adjustment.
(7)
Install the choke operating link and recheck the
choke valve opening, using a drill or gauge, Refer to
(Fig. 14).
Reinstall the vacuum hose to the diaphragm and
make the following check:
( 8 )
With no vacuum applied to the diaphragm,
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