Chevrolet 70 1969 Series, Shop Manual

Page: 337 / 913

ENGINE FUEL SYSTEM 6M -10
ACCELERATOR
PUMP ROD
SHC5ET SCREWS'
IDENTIFICATION
SPECIAL SCREW k \ i TAG
FAST IDLE LINK LONG SCREWS ' ^
VIEW
A
ACCELERATOR PUMP ROD
^ ^ y CHOKE LEVER
’ S / , fA-.T IDLE LINK
9
'«*■*•
■ ' . , ■ Z'
. ■ «; .■ ? — v
I .
& •
" M - /
S i
.
■
THROTTLE LEVER
' f t
\ / ’ ®4 IDLE SPEED
i
FAST IDLE SCREW
SCREW
VIEW B
IDLE MIXTURE SCREWS
VIEW C
T - 4 3 1 3
Figure 10—Adjusting Vacuum Idle Slop
b. Adjust the plunger with a 3/8-inch open end
wrench until the face of the plunger hex contacting
the carburetor throttle lever results in an idle
speed of 550 rpm.
6. Adjust the idle mixture screws (fig. 15).
With engine running and idling speed set, turn
each mixture screw "in" until engine begins to
slow down or run unevenly, then back out screws
until engine runs smoothly with highest vacuum
gauge reading.
Figure 9— Bendix Slromberg Carburetor (W W C Series) Figure 11— Fast Idle Adjustment IW W C Series)
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M ANU AL