152 EMISSION CONTROLS AND FUEL SYSTEM
the notched portion of the gauge fits over the
edge of the casting. Bend the floats until their
sides just clear the vertical uprights of the
gauge. Repeat the adjustment on the primary
float using either the
V&
in. float gauge or a
Vs
in. drill bit.
The vertical adjustment is correct when the
floats just clear the horizontal bar of the
gauges when the gauges are positioned as de-
scribed above. The required clearance be-
tween the top of the floats and the bowl cover
is
Va
in. on the primary floats and
¥4
in. on
the secondary floats.
Float drop measurement must be made
with the top cover gasket removed. Measure
between the lowest point of the floats and the
bottom of the top cover. This should be 2 in.
for both primary and secondary floats. Adjust
the accelerator pump by backing off the idle-
speed adjustment screw and positioning the
float-drop adjustment gauge (supplied in re-
building kits) on the dust cover boot. Bend
the top flat of the pump arm so that it is par-
allel to the gauge.
METERING ROD ADJUSTMENT
To adjust the metering rods, back off the idle-
speed adjusting screw until the throttle valves
are fully seated, then loosen the screw in the
metering arm. Depress the metering rod arm
upward until it just touches the hanger. Se-
cure the arm with the set screw.
UNLOADER AND SECONDARY
THROTTLE LEVER ADJUSTMENT
Make the unloader adjustment with the
throttle valves wide open. Measure between
the inboard edge of the choke valve and the
center wall of the top cover. Bend the un-
loader tang to obtain a
3
/ie in. clearance.
Turn the carburetor upside down to adjust
the secondary throttle lever. With the pri-
mary valves wide open, the secondary valves
should be within 4° to 7° of the wide open
position. Bend the connector rod at its upper
angle until actuation of the throttle linkage
fully opens the primary valves. Bend the tang
on the secondary throttle dog so that with the
1. Secondary jets
2. Pump jet cluster attaching screw
3. Pump jet cluster
4. Cluster gasket
5. Metering rod jets
6. Pump discharge needle
7. Vacuum piston spring
8. Pump plunger assembly
9. Pump plunger return spring
10. Pump inlet ball retainer
11. Carburetor body
12. Screw
13. Auxiliary throttle valve cam
14. Auxiliary throttle valve shaft
and weight assembly
WCFB throttle body parts
15. Auxiliary throttle valves
16. Carburetor body basket
17. Throttle flange
18. Throttle flange attaching
screw
