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CARBURETOR-W
WC3
14-53
PPROX. 1/2 INCH OF FUEL
IN T H E BOWL
Fig. 74--Testing
Accelerator Pump Discharge and
Inlet Check Balls
Accelerator Pump Test
(1) Pour clean gasoline into the carburetor bowl ap-
proximately
Y 2
inch deep. Remove the accelerator
pump plunger from the jar of gasoline and slide
down in its well. Raise the plunger and press lightly
in the plunger shaft to expel the air from the pump
passage.
(2)
Using a small clean brass rod, hold the discharge
check ball firmly down on its seat. Raise the pump
plunger and press downward. No fuel should be emit-
ted from either the intake or discharge passage, as
shown in (Fig. 14).
(3) If any fuel does emit from either the intake or
discharge passages, it indicates the presence of dirt or
an imperfect seat. The passages should be recleaned
and then thoroughly blown out with compressed air.
Examine the ball seat for signs of damage that would
not allow the check ball to seat properly.
(4)
Reinstall the check ball and test again. If still
leaking, place a piece of drill rod down on the check
ball and rap sharply with a hammer. Remove the old
check ball and install a new one. Then
retest.
(This
operation forms a new ball seat in the carburetor
casting.)
(5) Install the venturi cluster gasket, then slide
the venturi cluster down into position. Install attach-
ing screws and tighten securely. Refer to (Fig. 6).
Again depress the accelerator plunger. A clear
straight stream should emit from each jet orifice. If
the streams are not identical (if either one is re-
stricted or diverted), remove venturi cluster and re-
clean.
After test, pour gasoline from the bowl and remove
the pump plunger.
(6) Check the float for leak or damage. If satisfac-
tory for further service, install in position in the bowl.
RESSURE
ON
'RING ONLY
Fig. 75-Measuring
the Float Setting
(7) Assemble the fuel inlet needle valve, seat and
gasket, then insert in the main body. Tighten
se-
curely. (If the needle valve is ridged or grooved, or
badly worn, a new inlet needle valve assembly should
be installed.)
Measuring the Floaf Height
The carburetor is equipped with a synthetic rub-
ber-tipped fuel inlet needle.
(1)
Invert the main body so that the weight of the
floats only is forcing the needle against the seat.
Be
sure hinge pin does not drop out of the float hinge.
Hold down with the fulcrum pin spring.
(2) Using Tool 73725 or a "T" scale, measure the
float level, as shown in (Fig. 15). There should be
inch from the surface of the fuel bowl to the crown
of the float at the center.
If an adjustment is necessary, remove the float, and
the fulcrum spring. Bend the lip of the float lever ei-
ther in or out until the correct setting has been ob-
tained.
CHOKE VALVE SCREWS
Fig.
7
"Air
Horn Exploded V i e w )
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