Table of Contents
Advertisement
SECTION 6M
ENGINE FUEL
CONTENTS OF THIS SECTION
Page
Carburetors
6M-1
Fuel Pumps .
Air Cleaners
6M-7
Special Tools
Page
6M-10
6M-12
CARBURETORS
INDEX
Page
General Description
6M-1
Service Procedures
6M-1
Preliminary Checks
6M-1
Idle Speed and Mixture Adjustment . . . . . . . . . . .
6M-1
Fast Idle Adjustment
. . . . . . . . . . . . . . . . . .
6M-3
Choke Adjustment
6M-3
Float Adjustment
6M-4
Page
Additional Adjustments
6M-4
Removal
6M-4
Test Before Installation
6M-5
Installation
6M-5
Fuel Filter Maintenance
6M-5
Choke Coil Replacement
6M-5
Throttle Linkage Adjustment
. .
6M-6
GENERAL DESCRIPTION
Various carburetors (fig. lc) are used with Chevrolet,
Chevelle, Chevy II, Camaro and Corvette passenger
vehicles.
These carburetors are designed to meet the
particular requirements of engines, transmissions and
vehicles, therefore carburetors that look alike are not
always interchangeable. (Refer to carburetor part num-
ber and/or specifications.)
Because many service procedures for the various
carburetors are similar, typical illustrations and pro-
cedures are used except where specific illustrations or
procedures are necessary to clarify the operation.
This section covers removal, installation and adjust-
ments (on engine) of carburetors. Also covered in this
section are maintenance procedures for choke coils,
throttle linkage and fuel filters.
For carburetor .over-
haul procedures and additional adjustments (bench), re-
fer to Section 6M of the Overhaul Manual under the
carburetor being serviced.
Specifications for carburetors are located in the back
of this manual.
SERVICE PROCEDURES
Preliminary Checks
1. Thoroughly warm-up engine. If the engine is cold,
allow to run for at least 15 minutes.
2. Inspect torque of carburetor to intake manifold bolts
and intake manifold to cylinder head bolts to exclude
the possibility of air leaks.
3. Inspect manifold heat control valve (if used) for free-
dom of action and correct spring tension.
Idle Speed and Mixture Adjustment (Except Air Injection
Reactor System)
NOTE:
This adjustment should be performed
with engine at operating temperature and park-
ing brake applied.
1. Remove Air Cleaner.
2. Connect tachometer and vacuum gauge to engine, then
set hand brake and shift transmission into neutral.
3. As a preliminary adjustment, turn idle mixture
screws lightly to seat and back out 1-1/2 turns.
CAUTION:
Do not turn idle mixture screw
tightly against seat or damage may result.
4. With engine running (choke wide open) adjust idle
speed screw to specified idle speed,
(automatic
transmission in drive, synchronized transmission in
neutral).
5. Adjust idle mixture screw to obtain highest steady
vacuum at specified idle speed.
NOTE:
On air conditioned vehicles, turn air
conditioning to the "on" position and hold the
hot idle compensator valve closed while adjust-
ing idle speed and idle mixture screws.
NOTE:
On Rochester BV carburetors the idle
mixture screw should be turned out 1/4 turn
from the "lean roll" position. The definition
of "lean roll" point is a 20 to 30 rpm drop
in engine speed obtained by leaning the idle
mixture.
6. Repeat Steps 4 and5 as needed for final adjustment.
NOTE: If necessary, final adjustment of the \
carburetor may be made with the air cleaner
installed.
7. Turn engine off, remove gauges and install air
clearer.
CHEVROLET CHASSIS SERVICE MANUAL
Advertisement
Table of Contents
