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1.4-10
CARBURETOR-HOLLEY
FLOAT SPRING
FLOAT
GAUGE
FLOAT
NK668
Fig. 10--Measuring the Float Setting
pin and secure with retainer clip.
(11) Install the fuel inlet needle, seat and new gas-
ket. Tighten seat securely. Install the float bumper
spring. Check the float setting as follows:
Measuring the Float Setting
With the carburetor inverted, slide the float gauge
C-3903
into position and check the setting on the
"touch" leg of the gauge, as shown in (Fig. 10). The
float should just touch the gauge. Reverse the gauge
and check the "No touch" leg. The float should just
clear the gauge.
If
an
adjustment is necessary, bend the float tab
(which touches the head of the fuel inlet needle) us-
ing needle nosed pliers.
Do
not allow the float tab to
contact the float needle head during this operation as
the synthetic rubber tip of the needle can be com-
pressed, giving a false setting.
Recheck float setting as described above after ad-
justment.
(1) Slide the economizer diaphragm and stem as-
sembly into position, making sure the vacuum holes
are aligned and that the stem is on the power valve.
Refer to (Fig.
5).
Install cover and retaining screws.
Tighten screws securely.
(2)
Slide the baffle into position in the fuel bowl,
now, place
the
fuel bowl gasket on the cover. Place
the fuel bowl in position, install screws and washers
and tighten alternately. (Be sure gasket is sealed in
the recess section of the main body. Tighten the
screws gently so as to compress only the lock-wash-
ers.
Screws drawn down too tightly could distort the
fuel bowl and cause a leak.)
Installing the Choke Vacuum Diaphragm
Inspect the diaphragm vacuum fitting to insure that
the passage is not plugged with foreign material.
Leak check the diaphragm to determine if
it
has in-
ternal leaks. To do this, first depress the diaphragm
stem. Then place a finger over the vacuum fitting to
seal the opening. Release the diaphragm stem. If the
stem moves more than
inch in 10 seconds, the
leakage is excessive and the assembly must be re-
placed. Install the diaphragm as follows:
(1) Slide the bowl vent valve rod assembly in posi-
tion on the air horn. Hold the rod centered in its
grooves, using a finger.
(2)
Install the vacuum diaphragm assembly on the
air horn, being sure the vent rod is in position. In-
stall the diaphragm attaching screws and tighten
se-
curely.
(3) Install the choke operating link in position be-
tween the diaphragm plunger (stem) and the choke
lever. Install the "E" clip to secure.
(4)
Inspect the vacuum diaphragm fitting and
re-
move any dirt
or
foreign material which could plug
the vacuum passage. Inspect the rubber hose for
cracks, before placing it on the correct fitting. Refer
to (Fig. 1).
Do not connect the vacuum hose to the diaphragm
fitting until after the vacuum kick adjustment has
been made. (See Carburetor Adjustments.)
ADJUSTMENTS
It is very important that the following adjustments
be made on a reconditioned carburetor and in the
sequence listed.
Fast Idle Speed and Cam Position
Adjustment
The fast idle engine speed adjustment should be
made on the vehicle, as described in "Fast Idle Speed
Adjustment" (On the Vehicle) 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 cam step occur at the proper
OSING PRESSURE
N CHOKE VALVE
DRILL O R GAU
ADJUSTING SCREW
ON SECOND STEP
AGAINST THE FACE
O F
THE HIGHEST STEP
Fig.
I I-Fort
Idle Cam
Position
Adjustment
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