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CARBURETOR-BBD
1 ' / z INCH
14-37
CHOKE
VALVE
WIYE OPLN-
-
Fig. 13-Choke
Operating Link Clearances
This free movement should also exist between the
kick and the open choke valve positions with the
en-
gine running. If binding does exist, the choke operat-
ing link has been improperly bent and should be cor-
rected.
Choke Unlouder (Wide Open
Kick)
(1) Hold the throttle valves in the wide open posi-
tion. Insert Tool T109-31 (or a
Vi''
drill shank) be-
tween the upper edge of the choke valve and the
inner
wall of the air horn, as shown in (Fig. 1 4 ) .
'
NK624
OPEN POSITION
Fig. 14-Measuring
the Choke Unloader Setting
Fig. 15-Bending
the Choke Unloader Tang
(2)
With a finger lightly pressing against the valve,
a slight drag should be felt as gauge is being with-
drawn. If an adjustment is necessary, bend the tang
on the fast idle lever, using Tool T109-22, as shown
in (Fig. 15) until correct clearance has been obtained.
Bowl Vent Adjustment
NOTE:
Any adiustment to the accelerator pump
means, that the bowl vent valve must be readjusted.
(1) With the throttle valves at curb idle, there
should be
'Ils
inch clearance between the bowl vent
valve and the air horn, when measured at the inner-
most or smallest dimension with a drill shank.
(2) If an adjustment is necessary, bend the short
tang on the vent valve operating lever, using Tool
T109-22, until correct opening has been obtained.
Idle Speed Adjustment (Curb Idle)
To make the idle speed adjustment, the engine must
be thoroughly warmed up. A more reliable idle ad-
justment can usually be obtained if the car has been
driven a minimum of five miles. For best results, it
is recommended that a tachometer be used in this ad-
justment.
The following precautions should be taken before
making the idle speed adjustment:
(1) To make the idle speed adjustment, turn the
idle speed screw in or out to obtain 500 rpm. (On cars
with air conditioning, set the idle speed at
500 rpi:i
with air conditioning On.)
Be sure the choke valve
fully open and that the fast idle adjusting screw
is
not contacting the fast idle cam.
(2) Turn each idle mixture screw
in
or
out
to ob-
tain the highest rpm. While making the adjustment,
watch the tachometer and notice that the speed can
be decreased by turning the screws in either direction
from the setting that gave the highest rpm reading.
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