Service Procedures - Chevrolet 1974 Light Duty Truck Service Manual

SERVICE PROCEDURES -

©
GAUGE BETWEEN LOWER
EDGE OF CHOKE V A LV E
AND A IR HORN W ALL
C D
<D
BEND TANG
ROTATE CHOKE V A L V E TOWARDS
TO ADJUST
CLOSED POSITION (USE RUBBER
BAND OR SPRING TO KEEP CHOKE
V A L V E TOWARD CLOSED POSITION)
(3) SEAT DIAPHRAGM BY PUSHING
PLUNGER IN WITH NEEDLE
NOSED PLIERS
VACUUM BREAK ADJUSTMENT
_ 2 J
© HOLD DOWN ON CHOKE
/. V A LV E WITH ROD IN
^ END OF SLOT
UNLOADER
CHOKE COIL ROD ADJUSTMENT
CHOKE COIL ROD ADJUSTMENT
STANDARD - 6 CYL.
MODELS M, MV
OPEN THROTTLE V A LV E
SO CAM FOLLOWER ON
THROTTLE LEVER CLEARS
FAST IDLE CAM
4 CYL.
„
GAUGE BETWEEN LOWER
EDGE OF CHOKE V A LV E
AND A IR HORN W A LL
HOLD THROTTLE
V A LV E WIDE OPEN
(? ) HOLD CHOKE
V A LV E
COMPLETELY
CLOSED
PUSH DOWN ON ROD
TO STOP (END OF
T R A V E L)
©
BEND ROD
TO ADJUST
© HOLD CHOKE
V A L V E
WIDE OPEN
<D
PUSH DOWN
NOTE: ON 1972 C A LIF O R N IA
APPLICATIONS, A SWIVEL IS
ON ROD
USED ON END OF CHOKE COIL
AG A IN ST STOP
ROD. TURN SWIVEL UP OR
© 4 DOWN ON ROD U N T IL TOP OF
BEND ROD T O '
ADJUST (SEE
NOTE FOR C A L IF .[
APPLICATIONS)
CHOKE COIL ROD ADJUSTMENT
AIR HORN TIGHTENING SEQUENCE
JiJ
MAIN METERING JETS
The main metering je t used in the single bore M ono­
je t differs fro m other models and should not be inter­
changed. It can be identified by 5 radial lines w hich
are stamped opposite the id e n tifica tio n number on
the jet face.
Example:
The number stamped on the je t face indicates the
orifice size. It can be tw o or three digits dependent
upon the size o f the orifice.
determined by subtracting 100 fro m the last three
digits o f the part number.
Stamped
Part No. On Jet
7034192 92
7034195 95
7034198 98
MAIN METERING RODS
The metering rod used in the M onojet carburetor can
be identified as follow s.
stamped on the shank o f the metering rod in the
area shown. The number denotes the diam eter o f
the rod at P oint " A " .
Example:
^ -
d i a m e t e r
DIAMETER "A"
Stamped No.
060
ENGINE FUEL 6M-47
©
TOP EDGE OF ROD
SHOULD BE EVEN WITH
BOTTOM OF HOLE
-V PIN ON SW IVEL IS
EVEN W ITH BOTTOM
OF HOLE IN LEVER.
4 CYL.
The je t size can be
Stamped
Part No.
On Jet
7034204 104
7034205 105
7034206 106
A three d ig it number is
060
" "
a
Diameter "A"
.060"
LIGHT DUTY TRUCK SERVICE MANUAL