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ENGINE: FUEL SYSTEM
89
SOLEX CARBURETOR
TYPE ({ 30 PIB 4»
SOLEX 30 PIB 4 carburetor is of the single throat,
downdraft type.
Operation.
During normal running of engine mixture feed
is obtained through the main jet (15, fig. 147) and
Venturi (21).
The correct blend of mixture
is
automatically
assured,
by
an air supply through a calibrated
orifice (5).
During engine operation at idle the idle jet (7)
and a calibrated orifice situated at rear of Venturi
(21) provide for fuel feed.
The idle mixture setting screw (16) allows of
definitely rating the grade of mixture being supplied.
Easy Starting Device.
This device assures easy starting from cold,
idle operation of a cold engine and car setout.
Use of choke is extended until engine reaches
its normal running temperature.
The mixture rate (rich or weak) changes after
the position of the choke control on dashboard.
With
the
choke control knob
all
the way out the
fuel mixture is very rich ensuring easy starting
even of a coldest engine.
The middle position of choke control is used
when the engine has already wanned up some-
what after starting or it has not yet cooled off after
a halt.
The choke is also equipped with a plunger valve
(59, fig. 149) system. When the engine is cranked
by the motor into operation, the plunger stands up
clearing an additional mixture passage; as soon as
the engine has been started, the speed rate in-
creases and so does vacuum, causing the plunger
to drop to the down position; as a result the ad-
ditional passage is blanked off.
Power Pump.
The power pump
is
of the diaphragm type and
operates as follows.
At idle, with a closed throttle, the diaphragm
(II, fig. 147) is caused to pulsate under spring
action, filling up the pump cavity.
The diaphragm (II) is tied to the accelerator
through a link fastened to the throttle shaft.
When the throttle opens, movement of shaft
instantly reflects into diaphragm pulsation which
forces fuel through the pump jet to the nozzle (3)
discharging into the Venturi (21).
Fig. 148 - Solex carburetor viewed from choke end.
48. Choke conlrollever. - 53. Cable housing lock screw.· 54. Choke
cable end clamp.
•
Float Level Adjustment.
Check float level as follows:
- take down the float from carburetor and place
it on gauge A. 95126, as shown in fig. 150;
- set the float arm (2, fig. 150) into touch with
both gauge dowels; correct adjustment of float
level is indicated by the absence of arm clearance
at dowels.
Otherwise, bend the float arm to obtain contact
conditions as above specified;
- fit gauge A. 95126 on needle seat
with
dowel
A
as shown
in
fig.
151;
in this position needle
should allow the gauge to slide freely;
Fig. 149 • Interior view of Solex carburetor body.
2. Air correction jet. - 23. Venluri. - 34. Power pump nozzle.
41. Power pump lnlel valve. - 58. Choke jet. - 59. Choke plunger.
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