Chevrolet Light Duty Truck 1973, Service Manual

Page: 481 / 979

SERVICE PROCEDURES - MODELS 2G, 2GV - TWO BARREL
E N G IN E FUEL 6 M - 5 7
IZ I
<D
P L U N G E R M U S T BE
F U L L Y E X T E N D E D
(B U C K IN G SPR IN G
COM PR ESSED)
(5 ) G A U G E BETW EN UPPER
EDGE O F C H O K E V A L V E A N D
W A L L OF A IR H O R N
® r
PUSH UP ON
L E V E R U N T IL
R O D IN B O T T O M r
OF S L O T
B END ROD
TO
A D JU ST
( 2 ) SE A T V A C U U M
D IA P H R A G M
U S IN G O U T S ID E
V A C U U M S O U R C E
©
PLACE ID L E SCREW
ON H IG H E S T STEP
OF FA S T ID L E C A M
C A U T IO N : USE C A R E W H E N C O M PR ESSIN G
P L U N G E R S P R IN G SO AS N O T TO
P U L L V A C U U M D IA P H R A G M O FF
ITS S EA T.
V A C U U M B R E A K A D J U S T M E N T
4 C Y L . -
(2 ) G A U G E B ETW EEN UPPER EDGE
OF C H O K E V A L V E A N D A IR
H O R N C A S T IN G
©
H O L D T H R O T T L E V A L V E S
W ID E OPEN
(3 ) B END T A N G T O A D JU S T
U N L O A D E R A D J U S T M E N T
(2^HOLD CHOKE © R E M O V E UPPER END OF ROD
VALVE WIDE OPEN^ — ^ FROM CHOKE LEVER
.(4) ROD SHOULD FIT
IN BOTTOM OF
SLOT IN LEVER
TO ADJUST, pi
BEND LEVER WITH
SCREWDRIVER IN SLOT
PUSH DOWN
ON RODTO
END OF
TRAVEL
C H O K E C O I L R O D A D J U S T M E N T
( V —8)
K
(2) HOLD CHOKE
VALVE WIDE OPEN
(4 )TOP EDGE OF ROD OR PIN ON
SWIVEL SHOULD BE IN SPECIFIED
LOCATION
'---
© R E M O V E
v. UPPER END
^ \ O F ROD
FROM CHOKE,
LEVER
PUSH DOWN
ON RODTO
END OF
TRAVEL
C H O K E C O I L R O D A D J U S T M E N T
4 C Y L . -
J j
5 3 4
A I R H O R N T I G H T E N I N G S E Q U E N C E
M j
METERING JETS
P A R T N U M B E R I N G I N F O R M A T I O N
The last tw o digits o f the part number indicates the
orifice size. These two numbers are stamped on the
face of the jet.
There are three types or groups o f main metering jets
used in the 2G, 2GV carburetors.
"G RO UP A "
M E T E R IN G JETS
9 0 “SQUARE APPROACH
(ZIN C PLATE)
"G RO UP B’ 'GROUP C'
M E T E R IN G JETS M E T E R IN G JETS
60 “APPROACH 60 “APPROACH
(SM ALL) (LA RG E)
Part Numbers
Group A 7002943 - 7 0 0 2 9 6 9
Group B 7002639 - 7 0 0 2 6 6 0
Group C 7008660 - 7 0 0 8 6 8 8
LIGHT DUTY TRUCK SERVICE MANUAL