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CARBURETOR-AFB
14-67
BEND ROD AT THIS ANGLE
SECONDARY
SHOE (BEND
TO ADJUST)
WIRE GAUGE
NK601
- I
P R I M A ~ Y SHOE
Fig. 20-Measuring
Clearance Between Closing
Shoes
I -
K E V
- -
~
Fig. 19-Measuring
the Secondary Throttle
Adjustment
ondary throttle operating rod at the angle, using Tool
T109-213, until correct adjustment has been obtained.
With the primary and secondary throttle valves in
the tightly closed position,
it
should be possible to in-
sert Tool T109-29 (.020") wire gauge, between the
positive closing shoes on the secondary throttle le-
vers, as shown in (Fig. 20).
If an adjustment is necessary, bend the shoe on the
secondary throttle lever, using Tool T109-22, until
correct clearance has been obtained.
Secondary Throttle Lock-Out Adjustment
Crack the throttle valves, then manually open and
close the choke valve. The tang on the secondary
throttle lever should freely engage in the notch of the
lockout dog. Refer to (Fig. 19).
If an adjustment is necessary, bend the tang on the
secondary throttle lever, until engagement .has been
made. Use Tool T109-22 for this operation.
After adjustments have been made, reinstall car-
buretor on engine, using a new gasket.
It is suggested that the carburetor be filled with
clean gasoline. This will help prevent dirt that
is
trapped in the fuel system, from being dislodged by
the free flow of fuel, as the carburetor is primed.
Idle Speed Adjustment-Kurb Idle)
To make the idle speed adjustment, the engine
must be thoroughly warmed up. A much more reliable
idle adjustment can usually be obtained if the car has
been driven
a
minimum of five miles. For the best
results, it is recommended that a tachometer be used
in this adjustment. Carburetors used on 273 cubic
inch engines are equipped with a by-pass air bleed
for setting the idle speed, other Models use idle speed
screws. (Before making the idle speed adjustment ob-
serve the following precautions:)
On cars equipped with the automatic transmission,
loosen the nut in the sliding link of the carburetor to
bellcrank rod so that the stop in the transmission will
not interfere with the free movement of the carbu-
retor throttle lever.
To make the idle speed adjustment, proceed as fol-
lows:
(1)
Turn the idle speed screw
in
or
out
to obtain
500 r.p.m. (With air conditioning
On,
set the idle
speed at 500 r.p.m.) Be sure the choke valve is fully
open and that the fast idle adjusting screw is not con-
tacting the fast idle cam.
(2) Turn each idle mixture screw to obtain the high-
est
r.p.m. While making the adjustment, carefully
watch the tachometer and notice that the speed can
be decreased by turning the screws in either direction
from the setting that gave the highest r.p.m. reading.
(3) Readjust to 500 r.p.m. with the idle speed
screw.
,
;X
CHOKE VALVE WIDE OPEN
FAST IDLE SP
NK602
Fig. 21-Fast
ldle Speed
Adjustment fon the vehicle1
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