223 6 thermal exhaust damper stuck

Two Wheels

Do you mean a throttle plate looking thing where the exhaust manifold meets the

exhaust pipe?

Has a bi metal watch spring on it and a counter weight?

It restricts exhaust on cold engine and fully opens when warmed up?
 
Hello Twowheels,

Try soaking the area with PB Blaster or a 50/50 mixture of ATF and acetone.
After soaking for at least overnight, then heat the manifold around the shaft and tap gently with a small hammer on the end of the heat riser shaft with a small hammer, then on the opposite side too. Hopefully with doing this often and patience it will free up. May require separating the intake manifold from the exhaust manifold to get at the inside where the valve is and soak it.

Sal
 
I have one pulled running from a 53 and it is free. Doing a motor swap in a 60 F100.
I see it has bushings. but locked up. I have used the actetone and atf on mc stuff.
 
It is called a heat riser in the mechanic trade. Chrysler ( any MOPAR dealer ) used to sell an aerosol can of stuff to spray on them. ( it is a type of penetrating oil ) it was the best stuff we could find. I do think that you may do just as well with the ATF/ Acetone mix. spray it several times and try working it back and forth. do not gorilla it. take your time it will work loose 9 out of 10 times, if you are careful.
 
The front bearing is probably going to be worse due to rust flakes from the round shield in front of it blowing back and getting lodged in it. Might want to work that round shield off the shaft, then slide the spring off the shaft so it is easier to get at. Seems like I sprayed some "rust-Eater" aerosol on the bearings and worked the shaft around a little bit to free up the shaft so it would turn. Then get some graphite grease and stuff it in the bearings with a screwdriver. Clean the rust off that round shield and paint it with some Hi-temp (2000 degrees) paint before you put it back on so it won't happen that often anymore.
 
I guess I will have to tell all of those motors I have rebuilt that I am not a mechanic. But wait Ford refers to it as an exhaust control valve. Heat risers are on top of the intake.
There use to be a rebuilt kit, but I do not see them any more.
 
Twowheels, I like you reply. I worked a the the local G.M. dealership for 8 years. they referred to it as a heat riser. I have seen it call different names depending on who makes it , and also depends on the era things were manufactured. Gm. used to call them heat risers, until the computer controlled cars came along., then the thing was called an exhaust control valve, and the heat riser was a vacuum control mechanism. I have lived all over the U.S. and have found that depending what part of the country you live in it has a different name. that's what makes the hobby fun. lol.---Jim by the way some people call the heat crossover in the intake manifold that helps atomize the fuel in cold weather the heat riser.
 
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The heat risers were usually the first hing that got pitched in the junk pile when the headers were installed. The 6-cylinder cars generally mate the intake & exhaust together so it will warm things up but the valve just helps it warm up quicker. Most all these old cars were grumpy until the warmed up whether they had the riser or not. V8 engines sometimes plug the passages completely up with carbon so exhaust can't get through that if it tried. 6-cylinder engines were better in that respect.
 
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