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CARBURETOR-WWC3
14-57
LVE WIDE OPEN
VALVE AND
S
Fig. 23-Measuring
the
Bowl
Vent Valve Opening
(2) If an adjustment is necessary, bend the bowl
vent lever, using Tool T109-214, until correct opening
has been obtained.
NOTE: Any adiustment to the accelerator pump
setting, means that the bowl vent must be read-
justed.
Idle Speed Adjustment
The idle speed adjustment is made after the carbu-
retor has been installed on the engine.
For the best results, it is recommended that a ta-
chometer be used in this adjustment.
(1)
Turn the idle speed screw in or out to obtain
500 rpm. (On vehicles with air conditioning, set the
idle speed at 500 rpm, with air conditioning ON.) Be
sure the choke valve is fully open and that the fast
idle adjusting screw is not contacting the fast idle
cam (engine off fast idle).
(2) Turn each idle mixture screw
in
or
out
until
smooth idle has been obtained.
(3)
Readjust to 500 rpm with the idle speed screw.
(4) Repeat the idle mixture screw adjustment.
Fast Idle Speed I o n the Vehiclel"
To set the fast idle speed on the car, connect a ta-
chometer to the vehicle, then set the curb idle speed
and proceed as follows:
(1)
With the engine running and the transmission
in the neutral position, open the throttle slightly.
(2) Close the choke valve about 20 degrees then al-
low the throttle to close. Return the choke valve to
the open position.
(3) The fast idle speed adjusting screw should be
contacting the lowest step on the fast idle cam, as
shown in (Fig. 24).
(4)
With the engine warmed-up to the normal op-
erating temperature, turn the fast idle speed adjust-
ing screw
in
or
out
to secure 700 r.p.m. (Automatic
Transmission) or 700 r.p.m. (Manual Transmission).
Reposition the cam and throttle after every screw ad-
justment to apply normal throttle closing torque.
*After Approx. 500 Miles. (If Necessary).
Measuring the Float Setting or Fuel Level
(On the Vehiclel
Remove the three short air horn to main body
at-
taching screws. Then remove one long air horn to
throttle body screw next to fuel bowl and assemble
short screw through main body flange and thread into
the throttle body. Remove long screw from side away
from fuel bowl and on opposite side and assemble
short screw through main body flange. Securely tight-
en. Remove the air horn as follows:
(1)
Remove the spring clip and disconnect the
choke operating rod.
(2) Remove the hairpin clip and disconnect the fast
idle rod.
(3) Remove the hairpin clip that holds the pump
rod in the center slot of the pump arm. Disconnect
the pump rod.
(4) Remove the remaining two long screws and lift
off
the air horn.
Check the float setting as follows:
(5) Seat the float fulcrum pin by pressing finger
against the fulcrum pin spring.
There should be enough fuel in the bowl to raise
the float
so
that the lip bears firmly against the nee-
dle. Additional fuel may be admitted by slightly de-
pressing the float. If the pressure in the line is insuf-
ficient to force additional fuel into the bowl, add the
necessary fuel from a clean container.
CAUTION: Since the manifolds may be hot, it i s
dangerous to spill onto these surfaces. Therefore,
take the necessary precautions to avoid spillage.
(6)
With only the pressure from the buoyant float
holding the lip against the inlet needle, check the
float setting, using Tool 73725 or
"T"
scale. There
!'>Y
FAST IDLETPEED SCREW ON SLOWEST
CAM
(/
SPEED STEP OF THE CAM
NK437
Fig. 24-Fast
Idle
Speed Adjustment
fon the
Enginej
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