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CARBURETOR-BBD
1
' / 2
INCH
14-35
air horn, a thorough cleaning will be required.
(2) Remove the accelerator pump plunger from the
gasoline, slide the compression spring and spring seat
over the shaft. Install the assembly in the air horn
and engage with the accelerator pump arm.
(3) Place a new gasket on the main body, and in-
stall the air horn. Install attaching screws and tighten
securely. (When installing air horn, be sure the leather
on the plunger does not wrinkle or fold back.)
(4)
Engage the accelerator pump rod with the pump
rocker arm and install loose end in the center hole of
throttle lever. Install hairpin clip to secure (Fig.
1).
(5) Engage the fast idle connector rod in the fast
idle lever and throttle lever. Install hairpin clip to se-
cure.
Choke Vacuum Diuphragm
Inspect the diaphragm vacuum fitting to be sure that
the passage is not plugged with foreign material. Leak
check the diaphragm to determine if it has internal
leaks. To do this, first depress the diaphragm stem,
then place a finger over the fitting to seal the open-
ing. Release the stem. If the stem moves more than
'Il6
inch in ten (10) seconds, the leakage is excessive
and the assembly must be replaced.
(1) Install the diaphragm assembly on the air horn
and tighten the attaching screws securely.
(2) Install the choke operating link in position be-
tween the diaphragm plunger (stem) and the choke
lever. Install the clip to secure.
(3) Inspect the rubber hose for cracks before plac-
ing
it
on the correct carburetor fitting. Do not connect
the vacuum hose to the diaphragm fitting until after
the vacuum kick adjustment has been made. (See Car-
buretor Adjustments.)
ADJUSTMENTS
It is very important that the following adjustments
are made on a reconditioned carburetor and in the
sequence listed:
Accelerutor Pump
(1) Back
off
the idle speed adjusting screw. Open
the choke valve so that the fast idle cam allows the
throttle valves
to
be completely seated in the bores.
Be sure that the pump connector rod is installed in
the center hole of the throttle lever.
(2) Close the throttle valves tightly. Measure the dis-
tance between the top of the air horn and the end of
plunger shaft, as shown in (Fig. 9). This measurement
should be 1"
+
or -
1/64
inch.
(3) To adjust pump travel, bend the pump connec-
tor rod, using Tool T109-213, at the lower angle of
rod, until correct setting has been obtained.
Fast Idle Speed and Cam Position
Adjustment
The fast idle engine speed adjustment should be
made on the vehicle, as described in the Fast Idle
Speed Adjustment (On the Car) Paragraph. However,
the Fast Idle Cam Position Adjustment can be made
on the bench. This adjustment is important to assure
that the speeds of each step of the cam occur at the
proper time during engine warm-up.
(1) With the fast idle speed adjusting screw contact-
BE SURE
THE
CURB
IDLE
SPEED ADJUSTING
OFF.
3END
W - H H U B
LEVER TANG
I
NK619
Fig. 9-Measuring
the Accelerator Pump Setting
Fig. 1 &Fast
Idle Cam Position Adjustment
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