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14-52
CARBURETOR-WWC3
sembly. See (Fig. 9).
If a new shaft should
be
installed in an old worn
throttle body, it would be very unlikely that the orig-
inal relationship of these ports to the valves would be
obtained. Changing the port relationship would ad-
versely affect normal car operation between the
speeds of 15 and 30 miles per hour. However, if
it
has
been determined that a new shaft or valves are to be
installed, adhere closely to the following instruc-
tions:
To install a new throttle shaft or valves, refer to
(Fig. lo), then proceed as follows:
(2)
Mark the valves to be sure each is replaced in
its
original bore, if replacing throttle shaft only.
(3) Remove the screws that hold the throttle valves
to the shaft. Slide the valves out of shaft and bore.
CAUTION:
These screws are staked on the opposite
side and care should
be used
at removal so as not to
break the screws in the shaft. Remove the staking
with a file.
(4)
Slide the throttle shaft and lever out of the
throttle body.
(5)
Install the new throttle shaft and lever in the
throttle body.
The idle speed adjusting screw must
be
backed off when seating the valves in the follow-
ing operation.
(6)
Slide the valves down into position. Install
new
screws but do not tighten. Hold the valves in place
with the fingers pressing on the high side of valves.
(7) Tap the valve lightly with a screwdriver to seat
in the throttle bores. Holding the valves in this posi-
tion, tighten the screws securely and stake by squeez-
ing with pliers.
(8)
Install the two idle mixture adjusting screws
and springs in the throttle body. (The tapered portion
must be straight and smooth.) If the tapered portion
TTACHING SCREWS
POWER BY-PASS J
VENTURI CLUSTER
FULCRUM PIN
FUEL INLET NEEDLE
VALVE SEAT AND
G
FLOAT BAFFLE
INLET CHECK BALL
MAIN METERING J
PASSAGE PLUGS
N Y 343
Fig. 1 I-Main
Body Exploded View]
Fig. 12-Installing
Accelerator Pump Inlet
Check
Ball
is grooved or ridged, a new idle mixture adjusting
screw should be installed to insure having correct
idle mixture control.
Idle Mixer Screw Adjustment
Turn the screws
lightly
against their seats, then
back off one and a half turns for an approximate
setting.
Muin Body
To assemble the main body, refer to (Fig.
ll),
then
proceed
as
follows:
(1) Place a new gasket on the throttle body, then
install main body. Install two short screws to secure.
(2)
Install the main metering jets in the main body.
Tighten securely, using Tool T109-173. Refer to (Fig.
8).
(3) Install the power by-pass jet and new gasket.
Tighten securely, using Tool 73598. Refer to (Fig.
7).
(4)
Install the accelerator pump inlet check ball
inch) in the pump well, as shown in (Fig. 12).
(5) Install the accelerator pump discharge check
ball (Vi inch) in the discharge passage, as shown in
(Fig. 1 3 ) .
Fig. 134nrtalling the Discharge Check Ball
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