Cadillac 54-6219 1954 Shop Manual page 257

12-26
ENGINE FUEL AND EXHAUST
NOTE: Keep ball separated from ball re- 8. Slide secondary throttle actuating lever and
moved in step e. 2. override spring off primary throttle shaft.
7. Remove and discard fuel sight plugs if threads 9. Remove throttle link from secondary throttle
or screwdriver slots are damaged. Otherwise, lever.
plugs may be left installed.
10. Remove secondary throttle lever retaining
g. Throttle Body Removal screw and spacer from secondary throttle shaft.
1. Remove 3 linkage rods, as described In Note 11. Slide secondary throttle lever and secondary
lOb, if this
has not already been done. throttle return spring off
throttle shaft.
2. Invert carburetor on workbench. NOTE: Do not attempt further disassembly of
the throttle
body. The low
speed ports in each
3. Remove
large screw and lockwasher from throttle valve bore are
bored at the factory after
counterbore in center of throttle body, using a the valves are installed and adjusted, gaging from
screwdriver, the closed throttle valve. If original adjustment
of throttle valves is changed, the low speed
4. Remove 3 small attaching screws and lock- metering calibrations will be
changed.
washers using a cross-head screwdriver.
NOTE: First remove idle speed-up control
11 Inspection
and Cleaning
of
vacuum pipe from nipple, on Air Conditioner
Rochester Carburetor
Parts
equipped cars.
1. Thoroughly clean all metal parts of carbure-
5. Break throttle body loose from bowl with tor in carburetor cleaning solvent, with the excep-
finger pressure only. Do not attempt to pry bowl tions noted below, and dry with compressed air.
loose.
CAUTION:
Do not wash accelerator pump
gaem0
and discard throttle body to bowl
plunger assembly, thermostat coil and cover
assembly or pump boot, in cleaning solvent.
Wash these parts in clean gasoline only.
h. Throttle Body Disassembly
2. Clean and blow out all passages with com-
1. Remove 2 Idle adjusting mixture screws with
pressed air. Remove any gum deposits which may
springs.
have accumulated within carburetor pans. Clean
2. Remove nipple for distributor vacuum line, carbon out of throttle
body heat passage.
Remove elbow for idle speed-up control vacuum
line if car is equipped with Air Conditioner. 3. Make sure all calibrated restrictions, such as
idle ports, air bleeds, or vents, are clean, but do
3. Remove idle stop screw hex-head with spring not pass drills through these passages.
from throttle body, and remove fast idle adjusting
screw with spring from primary throttle lever. 4. Check all shafts and their corresponding
bearing bores for wear. Check each piston in its
NOTE: Keep each adjusting spring with its respective cylinder. Check for worn jets and worn
adjusting screw for easier identification, holes in the ends of the various levers.
4. Remove cotter pin, flat washer, spring washer 5. Inspect the accelerator pump plunger leather,
and T.V. trunnion from throttle lever. Discard
replacing the plunger as an assembly if the leather
cotter pin, is creased or cracked.
5. Remove horseshoe clip from each end of
6. Examine float needles and seats. If a needle
secondary throttle actuating link. Remove washer
from upper end of throttle link,
appears grooved, replace entire set with a factory
matched needle, seat, and gasket.
6. Unhook inner long end
of
primary throttle
shaft override spring from lever, using long-
7. Inspect idle mixture adjusting screws for
burrs, ridges, or grooves. If wear
is evident, re-
nosed
pliers,
place screws.
7. Remove override spring retaining screw from
primary throttle shaft. 8. Inspect floats for dents or leaks. Inspect