Pontiac FIREBIRD 1972 Service Manual page 686

6B-32 1972 PONTIAC SERVICE MANUAL
DISASSEMBLY, CLEANING AND INSPECTION OF WGD 2-BARREL CARBURETOR
DISASSEMBLY OF CARBURETOR
Place carburetor on a suitable mounting fixture, such
as 5-5923. Remove hair-pin from upper end of fast
idle rod.
Remove choke vacuum break diaphragm hose from
the throttle body flange.
Remove hair-pin from lower end of choke break link
and remove link.
Remove the vacuum break diaphragm unit from the
air horn by removing two attaching screws.
Remove pump rod spring clips and pump rod.
Remove dust cover and gasket. Rotate eyes of meter-
ing rods off pins on vacumeter piston link and lift
rods out, using care to avoid bending them (Fig. 6B-
42).
Loosen set screws in metering rod arm and pump
arm. Pull countershaft and spring out, removing
arms at the same time. Leave pump arm link attached
to arm (Fig. 6B-44).
Remove eight (8) air horn screws. Remove air horn,
using care to avoid damaging float. Swing vacumeter
piston 1/4 turn to remove it from vacumeter link,
then remove link from air horn. Leave metering rod
spring in link (Fig. 6B-43).
Remove float lever pin and lift off float assembly.
Shake float to see if it is "loaded" with gasoline due
to a leak. Remove float needle seat and gasket.
Remove air horn gasket (Fig. 6B-43).
Choke valve and shaft must be free of dirt and carbon
accumulations. If necessary to disassemble, remove
screen from end of choke shaft, then both levers and
spacer. File ends of choke valve screws and remove.
Remove choke valve and shaft.
Remove pump plunger assembly and lower pump
spring from main body. Remove vacuum piston
spring (Fig. 6B-43). assembly and lower pump
spring. Remove vacuum piston spring. See Fig. 6B-
45.
Check fuel in bowl for contamination by dirt, water,
gum or other foreign matter. A magnet moved
through the fuel will pick-up and identify any iron
oxide dust that may have caused float needle and seat
leakage. Then, empty fuel from bowl.
Remove pump inlet ball check retainer, using
Remover T 109-56 or a stiff wire having a short hook
on the end. Remove both metering rod jets. Remove
pump jet screws, jet housing and gasket. Invert car-
buretor and catch pump inlet check ball and outlet
check needle (Fig. 6B-43).
13. Remove four screws from bottom of carburetor,
which connect the lower throttle body to the main
body. Remove main body and gasket from throttle
body.
CAUTION: Never attempt to remove main noz-
zles or anti-percolator vents from main body.
14. Do not remove the idle mixture adjusting needles
unless it is necessary to clean or replace the throttle
body flange, or if the idle mixture needles are da-
maged. New red idle mixture limiter caps are prov-
ided in the repair kit. Before the new limiter caps are
installed, it will be necessary to re-set the idle mixture
according to the specifications outlined in Section
6D.
NOTE: The throttle body need not be disassem-
bled further for normal cleaning and inspec-
tion.
CLEANING CARBURETOR PARTS
Regardless of the number of new parts that are used in
rebuilding a carburetor, the job in the end will not be
satisfactory unless all metal parts are thoroughly cleaned.
Because of the nature of carburetor parts, with numerous
small passages subject to fouling with tenacious carbon
and gum deposits, ordinary cleaning processes are entirely
inadequate. The correct procedure is to use a cleaning
bath in which metal parts can be immersed and "soaked"
for sufficient time after dissassembly to thoroughly clean
all surfaces and passages. Blow out all passages in castings
with compressed air and blow off all parts so they are free
of solvent.
Do not soak cork, plastic or leather parts in the cleaner.
Wipe such parts with a clean cloth.
Remove all carbon from barrels of the body flange so that
throttle valves may close properly. Be sure to clean all
carbon out of idle ports.
INSPECTION OF CARBURETOR PARTS
After being thoroughly cleaned, all parts of the carburetor
'should be carefully inspected for wear or damage as fol-
lows:
1. Check choke shaft for free action in air horn. If shaft
is worn so that excessive play in bearings exists, re-
place the shaft assembly.