I can't seem to find any information regarding gaskets for the heat riser. I have a large exhaust leak coming from the heat riser and when I removed it to inspect it seems there are no gaskets? The one end of the heat riser is flat and has a steel on steel seal to the manifold, and the other end of the heat riser has a machined donut shape that clamps to the pipe with the two bolts. None of these had gaskets and when I cleaned up the surfaces on the mating parts and reassembled the leak still happens. Is there supposed to be gaskets on both ends? Thanks

 

Pictures would be cool, a lot of people here use "heat riser" to refer to many different components....

 

The flat part has a gasket. I got a replacement at a Cole Muffler shop

 

I don't have any pictures, but it has a vacuum line running to it, with a butterfly valve inside. Bolts directly to the manifold on the drivers side. I took a pic from rockauto of what the new part looks like.

http://info.rockauto.com/getimage/ge...easons/126.jpg

It just seems odd there is metal to metal connections to seal the exhaust. I am used to seeing some kind of donut or gasket. If anyone has links or part numbers to the gasket I need, that would be awesome. Maybe there is some kind of gasket maker I can use?

 

Yes, I thought it odd at first, too, the first time I ever saw a connection like that.

I can't comment on this specific application, but it wouldn't surprise me if that device was designed to not use any additional gaskets.

I tried looking in the parts book but wasn't sure what you were talking about (people use "heat riser" for a lot of things) but let me se if I can find anything useful in there......

 

OK, found it in the FoMoCo 1980/89 Light Truck Parts Catalog, doesn't look like there are any gaskets installed with that device (so I would merely clean everything up good):
.
.

 

Heat riser. Ford has been using that ball type connection for years. As far as the flat part gasket. 31512 might be the NAPA number. If I was closer (600 miles away) to my 86 I could come up with the Cole number.

 

I might be wrong on that part number. If you go back to the Rock Auto cat. and check out exhaust manifold gaskets it shows a round and a flat with ears and bolt holes, I forget which one I used between the manifold and heat riser.

 

Is this it? Autozone part number 31512 or F14627

 

That should work.

 

When mine was leaking, it was not from the joint, but rather from the end of the butterfly shaft. there is a bushing that is supposed to be in there, it was GONE, and the exhaust was leaking out of the pivot hole. I had to replace the valve. That cured the leak!