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CARBURETOR-WW3
14-41
POWER BY-PASS JET
63x467
Fig. &Removing
or Installing Power By-Pass Jet
ers located in the main discharge strut section of the
carburetor main body. See (Fig.
5).
(14) Remove the fuel inlet needle valve seat and
gasket assembly. Discard the gasket.
(15) Using a small screwdriver, pry out the float
fulcrum pin retaining spring. (Cup the hand over the
float chamber to prevent the spring from flying out.)
Lift out the float and fulcrum pin.
(16) Remove the power by-pass jet and gasket, as
shown in (Fig. 6).
(17) Remove the screws and lockwashers that hold
the throttle body to the main body. Lift off the throt-
tle body.
(18) With the main body in an inverted position,
remove the main
73609. Discard the
(19) Using Tool
jet plugs; using Tool 73598 and
plug gaskets.
73606, remove the main metering
7"'
MAIN
KH 425A
Fig. 7-Removing
or Installing M a i n Mefering Jets
THR
NK444
K E
HOLES
Fig. 8-Ports
in Relation to Throttle Valves
jets, as shown in (Fig. 7). Do not substitute the main
metering jets No. 388208 used in previous carburetors
for No. 388539. (New type.)
(20) Remove the main discharge jets (or tubes),
using Tool 73608. This Tool has tapered right hand
thread and should be screwed into jet. The threads
that are formed in the jet during removal, will not
damage the jet.
(21) Unscrew and remove the idle mixture adjust-
ing screws and springs, from the throttle body.
The carburetor now has been disassembled into
three units, the air horn, main body and throttle body,
and the component parts of each disassembled as far
as necessary for cleaning and inspection.
NOTE: It
is usually not advisable to remove the
throttle shaft or valves unless wear or damage ne-
cessitates installation of new parts. To install new
valves or throttle shaft, refer to "Inspection and Re-
assembly" Paragraph.
INSPECTION AND ASSEMBLY
Throttle Body
(1) Check the throttle shaft for excessive wear in
the throttle body. If wear is extreme,
it
is recom-
mended that the throttle body be replaced, rather
than installing a new throttle shaft in the old body.
During manufacture, the location of the idle trans-
fer port and the spark advance control ports to the
valves is carefully established for one particular as-
smbly. See (Fig. 8).
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
is
to be installed, adhere
closely to the following instructions:
(2) Mark the valves to be sure each is replaced in
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