Chevrolet Chevelle 1977 Repair Manual page 218

6C-24
Fig. 6 C -6 7 ~ M e te rin g Je ts
7. Remove float assembly and inlet needle by pulling up
on retaining hinge pin. Do not remove inlet needle seat unless
it is damaged, in which case it and fuel needle must be
replaced as an assembly. If needle seat is to be removed, use
fuel inlet needle seat remover, J-22769.
8. Do not remove prim ary metering jets, Figure 6C-67
unless damaged or worn. No attem pt should be made to
remove secondary metering plates. If jets are removed but not
replaced, they should be installed in the same hole from
which they were removed.
9. Remove pump discharge check ball retainer screw and
check ball.
10. Remove vacuum hose from vacuum break assembly
and from tube connection on bowl if not previously removed.
11. Remove retaining screw from vacuum break
assembly and remove assembly from float bowl.
NOTE:
If further disassembly of vacuum break
mechanism is necessary, spread the retaining ears on
bracket next to vacuum break assembly, then remove
vacuum break assembly from bracket.
12. Remove secondary throttle valve lock-out lever from
float bowl.
13. Remove choke rod actuating lever from inside of
float bowl well.
Float Bowl Disassembly
1. Remove fuel inlet nut, gasket, filter and spring (Fig.
6C-68).
2. Remove secondary air baffle, if replacement is
required.
3. Remove prim ary main metering jets, if necessary.
NOTE:
N o attem pt should be made to remove the
A .P.T. metering screws, or secondary metering orifice
plates. These items are fixed and, if damaged, float bowl
replacement is required.
4. Turn bowl over and remove throttle body assembly
by removing two throttle body to bowl attaching screws (Fig.
OVERHAUL MANUAL
6C-69).
NOTE:
smallest venturi protrudes beyond the gasket surface.
5. Remove throttle body to bowl insulator gasket.
Throttle Body Disassembly
1. Remove pump rod from throttle lever by rotating rod
out of lever.
2. DO N O T REM OVE idle m ixture limiter caps unless
it is necessary to replace the m ixture needles or normal
soaking and air pressure fails to clean the idle passages. If the
idle m ixture needles are removed, refer to Service M anual for
adjustment procedure. If necessary to remove the idle
mixture needle, destroy plastic limiter cap. Do not install a
replacement cap as a bare mixture screw is sufficient to
indicate that the mixture has been readjusted.
CAUTION:
damaging throttle valves.
No further disassembly o f the throttle body is
required.
CLEANING AND INSPECTION
The carburetor parts should be cleaned in cold
immersion type cleaner.
CAUTION:
parts, diaphragms, pump plungers, should not be
put in immersion type cleaner as they will swell,
harden or distort.
The plastic cam on the air valve shaft (where used) and
Fig. 6C -68--Fuel F ilte r
Be careful when inverting bowl assembly as
Extreme care m ust be taken to avoid
The electric choke, rubber parts, plastic
Fig. 6C-69--Removing T hrottle Body