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14-6
CARBURETOR-HOLLEY
moderate temperatures.
Fuel from the bowl flows into the four basic fuel
metering systems, which are: the idle system, the
main metering system, the power enrichment system
and the accelerating pump system.
The choke valve located in the bore of the carbu-
retor is connected to a well type automatic choke. A
thermostatic coil spring provides fuel for cold start-
ing by closing the choke valve. After a cold start, the
choke vacuum diaphragm controls fuel delivery dur-
ing engine warm-up.
Additional fuel for acceleration is supplied by a
diaphragm type, mechanically operated pump. The
pump is operated by a lever connected by linkage
to
the throttle shaft. An override spring on the pump
insures a prolonged discharge of fuel for smoother
operation.
A power valve mounted in the metering body,
ac-
tuated by manifold vacuum, delivers the additional
fuel necessary for full power and high speed opera-
tion.
The fuel bowl is vented by an external vent valve
located in the top of the bowl. The vent valve is con-
nected by linkage to the throttle lever,
so
that the
valve is opened a prescribed distance when the vehi-
cle is at idle or completely shut down.
SERVICE PROCEDURES
DISSASSEMBLY
To disassemble the carburetor for cleaning or over-
hauling, refer to (Figs.
1, 2,
and 3), then proceed as
follows:
(1)
Place the carburetor assembly on repair stand
To01 C-3886.
(2) Remove the vacuum hose between the carburet.
or throttle body fitting and the vacuum diaphragm.
(3) Remove the "E" clip from the choke operating
link and disengage the link from the diaphragm
plunger (stem) and the choke lever. Refer to (Fig. 1
or
2).
(4)
Remove the choke vacuum diaphragm and
bracket assembly and place to one side to be cleaned
as a special item.
NOTE: As the vacuum diaphragm bracket
is being
removed, the bowl vent valve rod, spring and washer
assembly, (Fig. 4) will drop off.
(5)
Using a
vi''
wrench, remove the fuel inlet nee-
FAST IDLE
CHOKE
CHOKE
CHOKE
CAM LINK
DIAPHRAGM
CHOKE VACUUM
SCREW
ADVANCE
REPAIR BLOCK
(CURB IDLE)
TUBE FITTING
NK667
Fig. 2-Carburetor
Assembly 112-3059, and R-3060 Typical of R-3057 and R-3058)
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