Chevrolet 10 Series 1970 Service Manual page 365

Carburetors
Governors .
A ir Cleaners
General D es crip tio n ............................................................ ...............
Service P roced u res.............................................................. ................
Preliminary C h ec k s.......................................................... ...............
Fast Idle Adjustment ..................................................... ...............
Float Adjustment ( H o l l e y ) ............................................. ...............
.......................................... ...............
Vacuum Break Adjustment
T h rottle Return Check Valve Adjustment ..................
Addition al A d ju s tm e n ts .................................................
V arious carb u retors, designed to m eet the p a rticu lar
requirem en ts of engine, transm ission and veh icle are
used; th erefo re, ca rb u retors that look alike are not a l­
ways interchangeable. (R e fe r to carb u retor part number
and/or sp ecification s.) C arb u retors fo r engines with the
A ir Injection R eactor System are designed, p a rticu la rly
fo r these engines; th e re fo re , they should not be in te r­
changed with o r replaced by a carbu retor designed fo r an
engine without the A ir Injection R eactor System.
Prelim inary Checks
1. Thoroughly w arm -up
allow to run fo r at lea st 15 minutes.
2. Inspect torque of carb u retor to intake manifold bolts
and intake m anifold to cylin d er head bolts to exclude
the p o ss ib ility of a ir leaks.
3. Inspect m anifold heat control va lve ( i f used) fo r f r e e ­
dom o f action and c o r r e c t spring tension.
4. Check and adjust choke as required, using p r o c e ­
dures sp ecified in "E n gin e T u n e-u p " section.
5. Adjust id le speed and id le m ixture as outlined in
" Engine Tune-up" section.
Fast Idle Adjustment
Rochester M V , 4 M V and Holley
NOTE: The fast idle adjustment must be set
with e le c tr ic a l leads to the T ransm ission Con­
trolled Spark (T C S ) solenoid disconnected (fig .
lc ) and tran sm ission in " N eu tra l" .
1. P osition fast idle le v e r on high step o f fast idle
cam . (Second step on 4MV)
2. Make sure choke is p ro p e rly adjusted and in wide
open position - engine w arm .
SECTION 6 M
ENGINE FUEL
CONTENTS OF THIS SECTION
Page
6M-1
6
6M-9
CARBURETORS
Page
6M-1
6M-1
6M-1
6M-1
6M-2
6M-3
........... 6M-3
6M-3
GENERAL DESCRIPTION
SERVICE PROCEDURES
engine. If the engine is cold,
Fuel P u m p s ...........................................................................................
M-6 Special T o o l s .........................................................................................
INDEX
Carburetor R em ova l................................................. ....................
Carubretor Test Before In sta lla tio n ...................... ....................
Carburetor Installation .......................................... ....................
Fuel F ilter Maintenance
A u tom atic Choke C oil A ssem b lies........................ ....................
Choke C oil R e p la c e m e n t........................................ ....................
Idle S o le n o id ............................................................ ....................
T h rottle Linkage Adjustm ent ............................... ....................
This Section co vers rem ova l, installation and adjust­
ment (on engine) o f ca rb u retors. A lso co vered in this
section a re maintenance procedures fo r throttle linkages
and fuel filte r s . F o r ca rb u retor overhaul procedu res and
additional adjustments (bench),
the Overhaul Manual under the carbu retor being s ervic ed .
Specifications fo r ca rbu retors are located in the back
o f this manual.
I TCS S O LE N O ID
F ig . l c —Transm ission C o n tro lle d Spark E le c tric a l Lead
........................................ ....................
r e fe r to Section 6M of
ELECTRICAL LEAD
CHEVROLET TRUCK SERVICE MANUAL
Page
6M-14
6M-19
Page
6M-4
6M-4
6M-4
6M-4
6M-5
6M-5
6M-5
6M-6