Cadillac 54-6219 1954 Shop Manual page 254

12-23
ENGINE FUEL AND EXHAUST
5. Adjust fast idle screw to give a
speed of 1700 9. Remove and discard carburetor to manifold
RPM with transmission in neutral,
gasket.
6. Return engine speed to normal idle.
9
Installation
of
Carburetor on Engine
7. Shut off engine and remove tachometer.
NOTE: The
following procedure applies to
7 Idle Speed-Up Control Adjustment
both the Rochester 4 GC and
the Caner
WCFB
carburetor.
1. Start engine and allow it to warm up.
1. Scrape old gasket off intake manifold. Clean
2. Turn the Air Conditioner On".
gasket from bottom of carburetor. Place a new
3. With selector shift lever in the neutralposition
carburetor to manifold gasket over studs of intake
"N'; On Carter Carburetors
manifold, with opening for carburetor heating pas-
- . . .
sage toward front of car.
Adjust serrated nut on
rod to maintain idle speed
at 900 RPM. 2. Start distributor vacuum line into fitting on
carburetor throttle body.
Lock serrated nut with jam nut.
3. Lower carburetor onto intake manifold studs.
On Rochester Carburetors
with choke housing to right side of car.
Hold the stem with a wrench and adjust the hex-
4. Install and tighten 4 nuts on manifold studs.
head screw to maintain an idle speed of 900 RPM.
Be sure to tighten nuts evenly, using a short open-
end wrench.
8 Removal of Carburetor
from Engine
5. Tighten
distrthutor vacuum line fitting.
NOTE:
The following procedure applies to 6. Connect and tighten manifold to choke housing
both the Rochester 4 GC and the Carter WCFB
heater pipe.
carburetor.
7. Connect and tighten fuel line to carburetor.
Tighten fuel line at fuel filter. Note:
Be sure
1. Remove air cleaner and air cleaner mounting
strainer nut on RPD carburetor is tight.
stud and gasket.
2. Disconnect fuel line from carburetor and
8. Insert throttle relay
rod
in lower throttle
loosen fuel line at fuel filter. Note Carter requires
lever hole. Secure with
hook end of throttle re-
a 5/16 straight tube fitting in carburetor to attach
tracting spring, inserted from below.
fuel line. Rochester has a combined strainer nut
9. Open throttle and insert T.V. rod into trunnion
and 5/16 invert flare and, therefore, does not re-
on throttle lever. Install front jam nut loosely.
quire another fitting. Just screw in fuel line nut.
10. Install air cleaner mounting stud in carbure-
3. Disconnect manifold to choke housing heater
tor and gasket in position.
pipe.
4. Remove front jam nut from carburetor to
11. Install air cleaner.
transmission T.V. rod, and rotate throttle lever
to allow removal of
rod from trunnion leave trun-
12. Perform Idle Speed and Mixture Adjustments
nion attached to throttle lever, since the T.V.
rod
and Fast
Idle Adjustment, as outlined in Notes 4 to
must be readjusted when carburetor is replaced.
6 above.
5. Disconnect throttle relay rod from throttle
10 Rochester Carburetor
lever by removing throttle return spring from rod.
Disassembly
6.
Unscrew distributor vacuum line at carbure- a. Idle Speed-Up Control Removal on cars
tor throttle body fitting.
equipped with Air Conditioning
7.
Remove four nuts holding carburetor to intake
1. Remove vacuum pipe connection at idle speed-
manifold studs.
up control.
8. Lift carburetor off manifold, and disengage
2. Remove cover screw which retains control
distributor vacuum line, wire clip.