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48 automatic choke
My choke is not operating properly. It is adjusted properly and the bimetal seems to work at least partially. The electromagnet does not work. I have hooked a jumper to it from the battery and I can hear it click but it doesn't move the lever. I have looked at drawing of it and it appears that it should be attached to the shaft so I am speculating that it is not attached but can be reattached.
Another part of my problem is removing the choke from the manifold. The brass nuts are firmly attached to the studs and I am afraid that I might twist off the studs if I apply much pressure.
So my questions are (1) can the choke be repaired? (2) how can I remove the nuts without twisting off the studs?
These chokes can not be repaired. To remove the choke Iwould spray PB Blaster on the studs and nuts to loosen any rust and then slowly try to remove the nut. There should be a gasket under the body of the choke this is needed.
Di you setup the choke lever correctly and do you have any instructions onhow to setup the choke correctly?
I also have several NOS Sisson choke if you need to replace yours Yes these are not cheap asking $170 and this includes shipping
valley Forge, PA
I just replaced the choke on my 41 DeSoto. Its the same one you use on your car as well. Made by Sisson. Soak the nuts in a good penetrating oil for a couple of days and then try to remove them. Can't hurt if they don't move because you will have to drill them out anyway. I ended up having to drill mine out and put in new ones. When you reinstall your choke, make sure you use a high heat gasket so the metal spring does not come into contact with the exhaust manifold.
These chokes aren't cheap. Take your time looking for one to get a decent deal. I have seen them ranging from $165 to $250. There is one on eBay right now as a matter of fact. I think it was in the $180 range.
I still don't have the electric wire set up to my choke yet... but it works anyway from the engine heat. The wire delivers an electric impulse to slam the choke butterfly closed for a split moment when starting the car. I live in the Southeast and maybe its not as important here.
Good luck and I would love to hear how your story turns out.
1941 DeSoto Deluxe 2 Door Sedan
It's Delightful, It's DeLovely, It's DeSoto!
Thanks Richard and Dean. I know how to adjust the choke. I have the service manual and an old Motor repair manual. I think I will try a small nut splitter to remove the nuts. Richard I need to get with you to purchase one of your nos chokes. The car is ok in warm weather but hard to start and keep running in cold weather until it warms up.
Jim: I have the sisson testing stand and if you want to send me your used unit I could but it on the stand to se if it is still working. The stand tests to see if the arm movement fall withint a specific range based on the current temperture
If you do need to purchase a NOS unit I will also send along a copy of the sisson choke manual and also a Sisson Pin that is used to setup the choke.
I am still working on removing the brass nuts. I am thinking of using a nut splitter. Can’t find a small one locally so it looks likeAmazon. I will certainly take your offer when I remove the choke.
I also working on the passenger side window. It is cracked and the chrome that the vent window seals against broke off and fell inside the door. I have the window out now and it appears that the chrome seal can be repaired.