Exhaust Manifold

[kalebbird]

Im new here! Purchased a 48 d24 on January 1st this year and working through some minor issues. I’m trying to figure out what this component is on my exhaust manifold. It’s to the left of my carb. Any direction is appreciated. Trying to see if this may be part of my issue running. Tuesday I took her up the road and today I’ve struggled to keep her running. May be partly due to flooding but I’m working through it. 

[OUTFXD]

I believe its the carb pre-heater.  When the engine is cold, the coil is short.  It routes Exhaust gasses the just below the carberator to warm it up faster on cold weather starts.  When the engine warms up, the coil expands closing the butterfly so the exhaust gasses dont overheat the carb causing fuel boil.

 

Many people have just blocked this off and claim it doesnt have a noticable affect on drivability. however if it rusts open,  it can lead to fuel boil. just make sure the inner pivot moves freely.

[kalebbird]

It seems the arm moves freely I may remove it to ensure which direction is closed until I can get a block off plate. It seems there should be connections made to it but I cannot seem to find where they would come from as it is not currently connected to anything. Appears to have a threaded hole on the top left and the arm on the back side from this view looks like it could attach to something as well but nothing looks directly related to it. 

[OUTFXD]

Its not electrical.  Works purely on Engine heat.

 

Glad yours is free! Mine was rusted open!

 

Best of luck with your project!

[9 foot box]

   The part in the center of your picture is a Sisson automatic choke. You have a truck or Plymouth carburetor on your car with a manual choke cable. It looks like the outer part of the choke cable isn’t secure, so it is moving, but the choke butterfly is staying in the choke position. The lower device, under the carburetor is the manifold heat control.

[P15-D24]

Downloads section has a lot of info about the set up of this device.

[OUTFXD]

Not sure which we are talking about. On the side of the exhaust manifold below the carb is the pre-heater.  Twords the back of the block between the intake manifold and block on one of the exhaust manifold runners is the Sisson automatic choke.

[Roofus]

Yes, automatic starter that is not used because 1/ you have a manual starter;2/ The control tingle no longer exists.

There is an electrical connection that goes to the starter motor order.

It cannot be linked to your problem.

Edited March 14, 2025 by Roofus

[Young Ed]

You guys are talking about two different things. Below the carb is the heat riser. Towards the firewall also on the exhaust manifold is the automatic choke for the carb.

[P15-D24]

D24s have the automatic choke option.  However it looks like yours has been modified to make it a manual choke.

[kalebbird]

Thanks everyone for your help. Now that I have the proper terminology to use, I can search for further answers and have been reading a bunch on here about this topic already so my apologies for another thread! Please enjoy a photo of my project in the works!

[Roofus]

It reminds me of something