Jump to content

48 Traveler choke


CTraveler

Recommended Posts

My 48 Traveler has a device linked to the choke, it has a wire not attached to anything, look like a coil of some type. Is bolted to the manifold, Manual dosent say much, I assume the wire operates a heater coil which slowly opens the choke when engine is cold, I will try to attach it to a hot lead and see what happens, is it connected to manifold in any way? If coil dosent work I will wire the choke open.

Link to comment
Share on other sites

Guest De Soto Frank

Find a MoToR's or Chilton's shop manual that covers any of the years between 1935 and 1950, and you'll find all you need to know about that Sisson electric choke.

There are two elements at work within that housing that's bolted to the manifold: a thermostatic spring that's supposed to be set-up to close the choke only about 1/2-way when the engine is cold. The other element is an electro-magnet, which is connected to the starter-motor side of the starter solenoid ( the big fat post that has the metal strap going to the terminal on the front,top of the starter housing); when the starter is operated, the elctromagnet closes the choke fully, then when the starter is released, the choke falls-back against the thermostatic spring, and gradually opens-up fully as the engine warms-up.

The manuals have full proceedure for proper adjustment of the choke.

Good luck !

<img src="http://forums.aaca.org/images/graemlins/cool.gif" alt="" />

Link to comment
Share on other sites

The electrical connection on the Sisson automatic choke energizes an electromagnet that's used to pull the choke plate closed while the engine is being cranked. The wire connects the choke to the starter so that it is energized only while cranking the engine. Once the engine is started, the heat from the exhaust manifold warms a thermostatic spring in the unit so the choke plate is opened as the engine warms up.

Doug

Looks like Frank and I were typing at the same time!

Link to comment
Share on other sites

Be careful here! You may be making a mistake.

The choke thermostat is like a metal cup with a lever sticking out. It is bolted to the exhaust manifold with 2 bolts. The lever has a rod that goes up to the choke at the top of the carb. It has a bimetallic coil spring that closes the choke when cold and opens it when the engine is hot.

There is no electricity or electrical wire involved.

It would help if you told us the make of car but I am assuming DeSoto. If so it has fluid drive. The fluid drive model has 2 electrical devices on the carburetor. One is a switch that is on when the throttle is closed, the other is on when the throttle is wide open The first causes the transmission to shift and it is located at the front of the carb at the top. This one has 2 wires. The other is the kickdown for rapid passing gear. It is at the back of the carb. This one has one wire.

It seems one of these wires has become detached. It should simply plug in again. The double wire to the top front, the single wire to the rear of the carb about halfway up. This rear connection has a wire clip to hold the wire in place, if the clip is missing the wire can fall out easy. The fitting the wire goes into is like a small brass tube with a slot in it for the wire retainer clip.

These wires should go to a box fastened to the air filter support, from there they go to the coil, and from there back around the engine to the transmission.

Hope this helps clear things up. If you look around on the net you should be able to find a picture of a Dodge DeSoto or Chrysler six with fluid drive. They are all practically the same from 1946 to 1954 as far as the carb wiring goes.

Link to comment
Share on other sites

Thanks for all the valuable advice. The wire off the Sisson choke is only long enough to reach the coil but my wiring diagram shows it should be connected to the starter selonoid as you stated, now I understand the function of the choke and will wire it properly. I will be posting other questions I have and need your help with.

Link to comment
Share on other sites

There is no wire on the choke????

There is no wire from the carb to the starter solenoid?????

If you mean the "sol" connection on the box on the breather strut, that goes to the solenoid on the transmission.

Not sure what wiring diagram you mean. I have some that omit the box on the strut for some reason.

The box contains a circuit breaker for the power supply which comes off the coil's - terminal.

It also contains a resistor that connects to the + side of the coil.

Link to comment
Share on other sites

Rusty,

The "Attachment" button, in the heading above, should bring up a sketch of the Sisson Automatic Choke, showing the electro-magnet and thermostatic elements.

The box you describe with circuit breaker and resistor sounds like the later simplified control scheme used on the M6 semi-automatics. The 46-48 cars have a transmission control relay and fuse mounted on the on the left side of the engine compartment and don't use a circuit breaker or resistor in the transmission electrical controls.

Doug

post-41910-143137908286_thumb.gif

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...