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6C-44
1977 PONTIAC SERVICE MANUAL
I
]
G W E T MUST N O T
INTERFERE WITH
INTERMEDIATE CHO
ROD
GASKET-- CARB.
ADAPTER
-
CARB
T O M A N I F O L D
CHOKE PIPE ASM.
ITIGHTEN FASTENERS SIMULTANEJMSU_I_N
CROSS
PATTERN AS.SHOWN BELOW T O SPECIFIED TORQUE
Fig.
6C-78 M2MC 2 0 0 Carburetor Removal
UNIT OVERHAUL
GENERAL
The procedures below apply to the complete overhaul
with the carburetor removed from the engine.
However, in many cases service adjustments of
individual systems may be completed without removing the
carburetor from the engine. (Refer to "On-Car Service").
A
complete carburetor overhaul includes disassembly,
thorough cleaning, inspection and replacement of all gaskets,
diaphragms, seals and worn or damaged parts.
DISASSEMBLY
NOTE: Before performing
any service on the
carburetor, it is essential that the carburetor be placed
on a holding fixture such as Tool 5-8328-1. Without the
use of the holding fixture, it is possible to bend or nick
throttle valves.
- -
-
- -
Fig.
6C-79 Choke Lever and Rod
2. Remove choke rod from lower lever inside float bowl
casting.
NOTE: Remove rod by holding lower lever outward
with
small
screwdriver
and
twisting
rod
counterclockwise.
3. Remove vacuum hose from front vacuum break unit.
4. With Tool 5-25322 drive roll pin (pump lever pivot
pin) inward just until pump lever can be removed from air
horn. Then remove pump lever from pump rod (Fig. 6C-80).
Note location of accelerator pump rod for reassembly.
C A UTI
0 N
:
Use care in removing small roll pin
to prevent damage to pump lever casting bosses in
air horn.
5. Remove nine air horn to bowl attaching screws: two
attaching screws are located next to the venturi. (Two long
screws, four short screws, one longer screw in front location,
and two countersunk screws.)
6. Remove air horn from float bowl by lifting straight
up. The air horn gasket should remain on the float bowl for
removal later.
CA UTI
0 N: When removing air horn fiom float
bowl, use care to prevent bending the small tubes
protruding fiom the air horn. These tubes are
permanently pressed into the air horn casting. DO
NOT REMOVE.
Air Horn
-
Disassembly
1. Remove front vacuum break hose. Then remove two
attaching screws and remove vacuum break control and
bracket assembly. D o not place vacuum break assembly in
carburetor cleaner.
Air Horn
-
Removal
1. Remove upper choke lever from the end of choke shaft
by removing retaining screw. Then rotate upper choke lever
to remove choke rod from slot in lever.
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