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ENGINE FUEL AND EXHAUST SYSTEMS
STROMBERG CARBURETOR
3-53
rection of air flow. See figures 3-91 and 3-83.
8. Install main metering jets, using Wrench
T-24924. See figure 3-82. Install main dis-
charge jet plugs, using new copper plug gas-
kets if available; otherwise make sure that
plugs and seats are clean to insure tight joint.
Figure 3-92-lnstalling Check Valve Ball and Pump
Discharge Nozzle
9. Install the pump outlet check valve ball,
new nozzle gasket, the discharge nozzle, the
nozzle attaching screw and a new gasket. See
figure 3-92.
10. Install idle tubes in main body. See fig-
ure 3-80.
11. Install power by-pass jet and a new gas-
ket in main body, using a large screwdriver.
See figure 3-79.
•
12. Attach accelerator vacuum switch to
throttle body with two screws, using a new
gasket between switch and body. Check switch
timing as described in paragraph 10-33.
13. Install the vacuum power piston in air
horn, using Wrench T-24733. Hold the tool flat
against the gasket surface to avoid damage to
the piston or to the tool. See figure 3-78. No
lubricant of any type should be used on the
piston or in the cylinder in the air horn. Piston
must operate freely without any lubrication.
14. Install float hanger with a new gasket on
each side and install new float needle valve seat,
using Wrench T-20140. See figure 3-77. Place
strainer over boss in inlet opening of air horn
and install gasoline connection.
15. Place new gasket on air horn. Attach
float needle valve to clip on float lever and at-
tach float assembly to float hanger with ful-
crum pin which should be tapped lightly so that
serrated end "bites" into hanger leg. Make cer-
tain float lever does not bind in float hanger
due to distortion of the legs. NOTE: All 1948
and
1949
carburetors use floats designed for 5
pound fuel pump pressure. These floats are
identified by a small numeral
5
stamped on float
lever. No other float should be used. Float may
be either brass or st
eel.
16. Adjust Float for Proper Fuel L
evel.
To ob-
tain .t he most efficient operation of the carbu-
retor, the fuel level must be maintained in the
bottom of the threads of the sight hole in the
side of float chamber, with engine idling. See
figure 3-17. This level will be produced in prac-
tically all cases by carefully setting the floats
with Float Gauge T-24971.
Figure 3-93-Checking Float Height
(a) With air horn inverted, place the float
gauge on top of gasket so that the locating but-
tons on gauge fit in holes in air horn. Gauge
must rest flat and solid on the
gasket.
See figure
3-93.
(b) Adjust each float so that the inner side
just touches the upright guide of the gauge;
•
this must be a light fit, without clearance and
without excessive drag on the gauge upright
guide.
(c)
Both
floats must be the same height with
reference to the ends of upright guides on gauge.
Brass floats must be
%4"
above
ends of gauge
guides. Steel floats must be
lhz"
below ends of
gauge guides. The distance is measured between
the top inside edge of float (not the seam) and
top end of gauge guide as shown at "X" in fig-
ure 3-93.
If
any change in height is required
it can be made by bending the float lever with
pliers at point shown in figure 3-94. Do not use
pressure on floats.
(d) The float needle valve must have
1!J.6"
of
travel from closed position. Check travel and
adjust, if necessary, by bending the float lever
stop to give specified travel.
17. Install retainer spring, splash washer,
and felt washer on stem of pump piston assem-
bly, then install piston assembly in air horn.
18. Install air horn assembly on main body,
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