Cadillac 60 Series 1963 Shop Manual page 247

10-12
FUEL AND EXHAUST
3. Lower carburetor onto intake manifold studs.
4. Position spark plug wiring bracket in right
front stud and tighten nut with fingers.
5. Install three remaining nuts on intake mani-
fold studs. Tighten all four nuts evenly to 14
foot-pounds.
6. Position small clamp on short rubber hose.
Connect hose to insulator fitting and secure with
clamp.
7. Connect distributor vacuum line.
8. Connect brake vacuum line.
9. Connect choke heat pipe to choke housing.
10. Connect idle speed-up vacuum line to idle
speed-up control if car is equipped with Air
Conditioner.
11. Connect carburetor fuel line at carburetor.
Be sure carburetor fuel inlet nut is tight.
12. Install throttle and TV linkage, leaving TV
rod lock nuts loose.
13. Install throttle return spring.
14. Install air cleaner mounting stud in car-
buretor, place air cleaner gasket in position,
and install air cleaner.
NOTE: Refer to Note 26 for carburetor
adjustments on engine.
21. Carburetor Inspection
and Cleaning
1. Thoroughly clean all metal parts of carbu-
retor in cleaning solvent, with exceptions noted
below, and dry with compressed air.
CAUTION: Do not wash accelerator pump
plunger assembly, pump boot, or choke thermq-
static coil housing in cleaning solution. Wash
these parts in clean solvent only.
2. Clean and blow out all passages with com-
pressed air. Remove any gum deposits that may
have accumulated within carburetor parts. Clean
carbon out of throttle body heat passage.
3. Make sure all calibrated restrictions, such
as idle ports, air bleeds, or vents are clean, but
do not pass drills through these passages. Use
compressed air only.
4. Check all shafts and their corresponding
bearing bores for wear. Check each piston in
its respective cylinder. Check for worn or dam-
aged jets and worn holes in ends of various
levers.
5. Inspect accelerator pump plunger leather,
replacing plunger as an assembly if leather is
creased or cracked. Inspect check ball in pump
for free movement. If stuck, replace pump.
6. Examine float needles and seats. If a needle
appears grooved, replace entire set with a factory
matched needle, seat, and gasket.
7. Inspect idle mixture adjusting screws for
burrs, ridges, or grooves. If wear is evident,
replace screws.
8. Inspect floats for dents or leaks. If floats
have any liquid in them, replace float. Inspect
hinge pin bores for burrs or wear. Check hinge
pins for straightness.
9. Clean strainer screens of dirt and lint. If
distorted or plugged, these screens should be
replaced.
10. Inspect auxiliary valve assembly. Shaft
must be straight and must not bind.
11. Carefully check body assembly and valve
assembly for wear at throttle valves and bores,
and between shafts and their bores. Check for
loose valves on their shafts.
22. Rochester 4GC Carburetor
Disassembly
NOTE: Late changes in the appearance of
the 1963 Rochester carburetor give an incor-
rect appearance to some of the figures in this
section. The parts affected are:
Mounting Screws
Idle Speed-up Lever
Fig. 10-9 Idle Speed-Up Control