THE SCHEBLER PLAIN TUBE CARBURETOR MODEL “FORD A”
[Illustration: Fig. 41. Schebler Carburetor Model Ford A--Sectional View
D--CHOKER OR SHUTTER IN AIR
BEND.
BE--LEVERS CLOSING CHOKER,
OPERATED FROM STEERING
COLUMN AND FRONT OF
RADIATOR.
H--LOW SPEED GASOLINE ADJUSTING
NEEDLE.
I--HIGH SPEED GASOLINE ADJUSTING
NEEDLE.
K--IDLE AND LOW SPEED BYPASS.
M--ACCELERATION WELL.
P--PILOT OPENING.]
The Pilot tube principle is introduced for the first time in the
carburetor and this Pilot tube or improved type of gasoline nozzle is
so designed or built that it automatically furnishes a rich mixture for
acceleration and thins out this mixture after the normal motor speed
has been reached. This furnishes a very economical running mixture at
all motor speeds, together with a smooth and positive acceleration.
The importance of this Pilot tube or nozzle principle cannot be over
emphasized, as it furnishes a flexible, powerful and economical
mixture, without the addition of any complicated parts. The Ford “A”
carburetor has no parts to wear or get out of adjustment.
[Illustration: Fig. 42. Schebler Carburetor Model Ford A--Adjustment
Points]
Two gasoline needle adjustments are furnished. One for low speed and
idling and one for high speed. These adjustments have been found
advisable and necessary to properly handle the present heavy grades
of fuel and the variations in the motor due to wear, etc. Those
adjustments also insure the attaining of the widest range of motor
speed.
A double choker is furnished, and with these controls the Ford can be
easily started under the most severe weather conditions and the mixture
controlled from the driver’s seat.
With the Ford “A” carburetor a low speed of four to five miles an
hour can be secured without any loading or missing. Also, with this
carburetor the maximum speed and power of the motor are obtained.
INSTRUCTIONS FOR INSTALLING AND ADJUSTING THE SCHEBLER FORD “A”
CARBURETOR
First, remove the Ford carburetor from the manifold, also the dash
board control, the hot air drum, and tubing, and the radiator choke
wire. Be sure to save the cotter pin used in the throttle control.
Install the Schebler carburetor, using gasket and cap screws which are
furnished with the equipment. The gasoline connection is the same as
regularly furnished on the Ford equipment and no other connections are
necessary. Screw the connections on the Ford gasoline line onto the
connection furnished on the carburetor. Attach the hot air drum and
the tubing to the exhaust manifold and run the choke wire through the
radiator.
Before adjusting carburetor, see that the spark plugs are clean and
set about .035, or nearly the thickness of a new dime. See that the
compression is good and equal on all four cylinders. See that the timer
is clean and in good shape, as an occasional miss is due to the roller
in the timer becoming worn. Also, be sure that there is no leak in the
intake manifold.
The steering post control must be set so that the tubing is fastened
into set screw (A) and the control wire is fastened through the binding
post in lever (B) with steering post control or plunger pushed clear
in and the butterfly shutter (D) in the hot air horn or bend open, so
that when the plunger control is pulled out the wire (C) in the binding
post (B) on lever closes the shutter (D) almost completely. This will
furnish a rich mixture for starting and warming up the motor under
normal weather conditions.
The wire running to the front of the radiator must be attached to lever
(E) so that when the motor is cold, the shutter (D) can be closed
tight, thus insuring positive starting. However, this wire must be
released immediately upon starting the motor or the motor will be
choked by excess of gasoline.
To start the motor, open low speed needle (H) and high speed needle (I)
about four or five complete turns. You will note that the needles have
dials which indicate turning needle to the right cuts down the gasoline
supply.
Pull out steering post control, open throttle about one-quarter way,
retard the spark, pull out radiator choke wire which will close shutter
and crank the motor. After motor is started, immediately release
radiator choke wire and gradually push in the steering post control or
plunger and let the motor run until it is warmed up. Then first adjust
the high speed needle (I) until the motor runs smoothly and evenly with
retarded spark. Close throttle part way and adjust idle needle until
motor runs smoothly at low speed.
In order to get the desired low throttle running, use the throttle stop
screw (L) which will control the throttle opening and give you the
desired low speed running.
A strainer is furnished on the carburetor which prevents dirt or
sediment getting into the bowl of the carburetor and choking up the
gasoline nozzle or causing flooding.