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14-24
CARBURETOR-BBD
1
' / 4
INCH
pressing the float. If the fuel pressure in the line is
insufficient to force additional fuel into the bowl,
add the necessary fuel from a clean container.
CAUTION: Since the manifolds may be hot, it is
dangerous to spill fuel on these surfaces. There-
fore, take the necessary precautions to avoid spill-
age.
(5)
With only the pressure of the buoyant float
holding the float lip against the inlet needle, check
the float setting, using Tool T109-239 or a "T" scale.
There should be
V i
inch from the surface of the bowl
(gasket removed) to the crown of the floats at the
center.
( S I z 2
on
certain Carburetors.)
If an adjustment is necessary, hold the float on the
bottom of the bowl, then bend the float lip toward
or
away from the needle. Recheck the v4 inch setting
again, then repeat the lip bending operation as re-
quired.
CAUTION: When bending the float lip, do not allow
the lip to push against the needle as the tip can
be
compressed sufficiently to cause a false setting
which will affect correct level of the fuel in the
bowl.
After being compressed, the tip is very slow
to
re-
cover its original shape.
It is very important that the float lip be perpendicu-
lar to the needle or slanted not more than 10 degrees
away from the needle when the float is correctly set.
(6) Reassemble the air horn.
PART 4
BBD SERIES (1
1 / 4
INCH) CARBURETOR
SERVICE PROCEDURES
DISASSEMBLY
To disassemble the carburetor for cleaning or over-
(1) Place the carburetor assembly on repair block
(2)
Remove the hairpin clips and disengage the ac-
celerator pump operating rod. On the 273 cubic inch
engine, the accelerator pump rod is located in the
outer hole of the accelerator pump rocker arm and in
the inner hole of the rocker arm for the 318 cubic
inch engine; refer to (Fig.
1).
(3) Remove the hairpin clip and disengage the fast
idle connector rod from the fast idle cam and choke
lever.
(4)
Remove the vacuum hose between the carbu-
retor main body and the vacuum diaphragm.
(5) Remove the clip from the choke operating link
and disengage the link from the diaphragm plunger
(stem) and the choke lever. Refer to (Fig.
1).
(6) Remove the choke vacuum diaphragm and
bracket assembly and place to one side to be cleaned
as a special item.
A
liquid cleaner may damage the
diaphragm material.
(7) Remove the air horn retaining screws and lift
air horn straight up and away from main body, as
shown in (Fig. 2). Discard the gasket.
(8)
Disengage the accelerator pump plunger from
the rocker arm by pushing up on the bottom of plung-
er and sliding plunger shaft off hook. Slide plunger
out of air horn and remove the bowl vent valve,
spring seat and spring.
haul, refer to (Fig. l), and proceed as follows:
To01 C-3225.
If the old plunger can be used again, or if a
new
plunger is to be installed, place the plunger in a jar
of clean gasoline or kerosene to prevent the leather
from drying out.
(9) Remove the fuel inlet needle valve, seat and
gasket from the main body.
(10) Lift out the float fulcrum pin retainer, then
lift out the floats and fulcrum pin.
(11) Remove the step-up piston retaining screw,
and slide step-up piston and rods out of well, as
shown in (Fig. 3). Now, lift out the step-up piston
spring. Remove the step-up piston gasket from the
bottom
of
the well.
(12) Remove the main metering jets,
as
shown
in
L
A
I
R HORN
FLOATS
Fig. 2-Removing
or
Installing Air Horn
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