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.
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.
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.