Table of Contents
Advertisement
20
1. Nut—fuel inlet
2. Gasket—fuel filter
3. Gasket—inlet nut
4. Fuel filter
5. Spring fuel filter
6. Fuel bowl
7. Seal—inlet needle
and seat assembly
8. Inlet needle and seat
assembly
9. Gasket—inlet
adjusting nut
10. Nut—inlet
adjusting
Primary carburetor float bowl; secondary has no
accelerator pump
CHOKE UNLOADER ADJUSTMENT-
PRIMARY CARB
Fully open the throttle valve and secure it.
Close the choke valve against the throttle shaft
unloader tang and bend the choke rod to ob-
tain the specified measurement between the
lower edge of the choke valve and the body.
DISASSEMBLY AND ASSEMBLY
Primary Carburetor
1. Remove the fuel bowl, metering body,
and splash shield. Disconnect the vacuum
break hose, remove the throttle body attach
ment screws, and separate the throttle body
from the primary carburetor body.
2. Remove the fuel inlet baffle, float hinge
screws, and the brass float. Remove the
needle and seat assembly lock screw, then
back out die adjusting nut and remove the
seat assembly.
3. Remove the sight plug and gasket, fuel
inlet fitting, filter, spring and gasket. Re
move the accelerator pump cover, dia
phragm, and spring.
4. Check the accelerator pump inlet ball.
If damage is evident, replace the bowl assem
bly.
5. Remove the main metering jets, power
valve, vacuum fitting, and the idle-mixture
needles and screws.
EMISSION CONTROLS AND FUEL SYSTEM
Gasket—inlet
lockscrew
Screw—inlet lock
Float assembly
Screw—float hinge
Fuel lever sight plug
Gasket—sight plug
Spring—pump
diaphragm Pump
diaphragm Cover
assembly—
14
pump diaphragm
Screw—pump
diaphragm cover
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
6. Remove the choke vacuum break, choke
lever and fast-idle cam. Remove the acceler
ator pump discharge nozzle and its check
valve.
7. Reverse the above procedure to assem
ble.
Secondary Carburetors
1. Remove the fuel bowl and metering
block. Disconnect the secondary diaphragm
housing from die throttle lever and separate
the housing from the carburetor body.
2. Remove the throttle body attaching
screws and separate the throttle body from
the main body. Remove die fuel inlet baffle
hinge screws and plastic float.
3. Remove the needle and seat assembly,
sight plug, fuel inlet fitting, filter, and spring.
Remove the metering body plate and gas
kets. Remove the diaphragm cover and dia
phragm.
4. Reverse this procedure to reassemble.
Holley 4150, 4160 Series
Carburetors
Holley four-barrel carburetors first appeared
on the Corvette in 1964. The 4160 used is an
end-inlet carburetor, while the 4150 carbu-
retors used have been both end and center-
inlet designs. The secondary metering body
on the 4150 carburetor is similar to the pri-
mary metering body. The 4160 secondary
metering body is a cast body and a plate at-
tached to the main body by six screws. The
center-inlet 4150 has been utilized on the
higher performance versions of the Corvette.
In 1971, the Holley carburetor has revised
calibration and a C.E.C. valve. Holley part
numbers are located on die carburetor air
horn.
CHOKE ADJUSTMENT
The early model 4150 uses a bi-metaUic choke
mounted on the carburetor. It is correctly set
when the cover scribe mark aligns with the
specified notch mark. The later model 4150
and 4160 employ a remotely located choke.
To adjust, disconnect the choke rod at die
choke lever and secure the choke lever closed.
Bend the rod so that when the rod is de-
pressed to the contact stop, the top is even
with the bottom of die hole in the choke le-
ver.
FLOAT LEVEL ADJUSTMENT
Position the car on a flat, level surface and
start the engine. Remove the sight plugs and
163
Hide quick links:
Advertisement
Table of Contents
