Chevrolet CHEVY VAN G10 SERIES Service Manual page 175

C arburetors .....................................
A ccelerators and Choke C ontrols
Air C le a n e r s .....................................
G en e ra l D escrip tio n ......................................................
Service P ro c e d u re s ..............................................................
P relim in ary C h eck s ......................................................
F a s t Id le A d j u s t m e n t ....................................................
V ac u u m B rea k A d ju stm en t
C a rb u re to r R e m o v a l ....................................................
C a rb u re to r T e st B efo re I n s t a l l a t i o n .......................
Various carburetors, designed to m eet the particular re­
quirem ents o f engine, transm ission and vehicle are used;
therefore, carburetors th a t look alike are n o t always in te r­
ch a n g ea b le . (Refer to carburetor
specifications.)
This Section covers removal, installation and adjustm ent
(on engine) o f carburetors. Also covered in this section are
MAINTENANCE AND SERVICE PROCEDURES
C h o ke— Choke mechanism
operation. A binding condition may have developed from
petroleum gum form ation on th e choke shaft or from damage.
Choke shafts can usually be cleaned w ith o u t disassembly by
-66
using U nited Delco X C arburetor and C om bustion Chamber
C onditioner or equivalent.
M anifo ld-C arb u reto r attaching bolts
Bolts, Carburetor to
and/or nuts should be carefully adjusted to correct torque to
com pensate fo r com pression o f gasket at first 4 m onths or
6,000
miles o f vehicle operation only.
F ilte r-C a rb u re to r and/or Fuel Pump—
fuel pum p filter m ay restrict fuel flow or bypass foreign
m aterial into carburetor depending upon type used. Replace
clogged filters. Also replace filters each 12,000 miles or 12
m onths, whichever occurs first.
SECTION 6M
ENGINE FUEL
N O T E : Also refer
Systems" Booklet fo r required' maintenance and
warranty inform ation.
CONTENTS OF THIS SECTION
P ag e
. 6M -1
6M -9
6M -11
CARBURETORS
P ag e
6M -1
6M -1
6M -2
6M -2
6M -3
6M -7
6 M -7
GENERAL DESCRIPTION
p art num ber and/or
should be checked for
A clogged carburetor or
to the "Emission Control
Fuel Pumps ...............................................................................6 M -1 5
Special Tools ............................................................................ 6 M -1 7
INDEX
C a rb u re to r In sta lla tio n
F u e l F ilte r M a i n t e n a n c e ..............................................
A u to m a tic C h o k e C o il A s s e m b lie s .......................... 6 M -9
C h o k e C oil R e p l a c e m e n t ............................................
A d d itio n a l E x te rn a l Settings a n d A d ju stm e n ts .
Id le S o lenoid ...................................................................
T h ro ttle L in k ag e A d ju stm e n t
m aintenance procedures for th ro ttle linkages and fuel filters.
F o r c a r b u r e t o r
adjustm ents (bench), refer to
Passenger Car and T ruck Chassis Overhaul Manual under the
carburetor being serviced.
Specifications for carburetors are located in the back o f this
manual.
CEC Valve, or Vacuum Advance Solenoid, and Hoses—
free
vacuum p o rtion o f either o f these valves should be checked,
w ith the transm ission in neutral, by using a vacuum gauge
attach ed to the valve (o r solenoid) distributor connector. With
the engine at fast idle, the vacuum gauge should read zero. The
electrical portion o f the solenoid or valve m ay be checked by
12
applying volts across its electrical term inals, w hich should
result in a vacuum reading on the gauge (except on Vega where
the results are exactly opposite— a vacuum reading should be
obtained only while the solenoid or valve is n o t energized). An
inoperative or leaking solenoid or valve should be replaced.
All hoses and wires should be carefully inspected fo r correct
routing and to make certain th a t they are intact.
Idle Stop S o le n o id -T h e
to assure th at it perm its the th ro ttle plate to close further
when the ignition sw itch is tu rn ed " o ff." An inoperative
solenoid should be replaced.
..............................................
o v e r h a u l p rocedures and
6
Section M o f th e
idle stop solenoid should be checked
C H E V Y V A N SH O P M A N U A L
P ag e
P ag e
6 -8
M
6 -8
M
6M -9
6M -9
6M -9
6M -9
additional
1972
The