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Exhaust Pipe - Exhaust manifold

J

JRSutton

Well-known Member
Before I hurt somebody, or something...

How is the exhaust pipe attached to the exhaust manifold??? (Super A)

I assumed it was threaded the way the new ones are...

Are they?

I've tried penetrating oil, heat, force, impact, more force, more heat, more oil...

About to try the breaker bar approach with the pipe wrench. But then it occurred to me that maybe this thing isn't even threaded.

Could it be welded?

It's so rusted I really can't tell what's what. Worst case scenario I'm sure I can just cut it and peel it out of there.

Figured I'd check here first for the RIGHT way to get it out.

Thoughts?
a51981.jpg
 
Yes it is threaded Just took one out of my super c. Heat the thick cast piece cherry red and the pipe should screw out with pipe wrench. Mine looked worst than yours. Good luck
 
This is one on those times if it's not broke DON'T MESS with it! As long as it is firmly attatched to the exhaust manifold and you can put a muffler on the pipe I would not mess with it because you might/will/could break the exhaust manifold and then that could be a real pain to change out and expensive and maybe hard to find. If you want to make the pipe look better see if you can a high tempture black paint because the pipe is black pipe. Armand
 
well, what you can't really see in the picture is how bent and twisted the whole thing is now.

(I did the old back-up-into-the-garage manuevre with this, so it was bent in half to begin with)

So I'm pretty much comitted to removing it now.
 
Cut it off 1/2 inch above the manifold with a sawsall. Then using short blade in sawsall cut vertically inside , just to the manifold . Peel it out. Done a dozen of em in less than 4 minutes.
Put a vaseline or greasy rag down in there after you make the horizontal cut. Best to do it with the manifold off the engine.
 
best way to get that apart is heat the whole thread area cherry red and use a pipe wrench. trouble is, you might not have very good threads on the manifold after all that. if you have enough good pipe on the bottom, you might try cutting it off square and cutting new pipe threads, then a coupling and another pipe.
 
My super c wasn't threaded. it was a drive in 1 3/4"
od tube. don't know if it is supposed to be like that, but is. this piece is about nine inches long and
1 15/16" od for muffler to slide on.
 
When new it had threads as all of them were threaded A,AV,B,BN,C,SC and on it went someone did a number on yours to drive pipe in
 
heating the cast manifold unevenly can result with a broken manifold, can get more even heat with manifold off tractor
 
Do not do anything with the manifold attached to the tractor. There was an H in my neighbour's shop one day and I asked what was going on. Well he said the owner decided to do some heating/welding on the top of the manifold..got some slag down inside..then started the tractor.pieces of slag in the valves and on top of the pistons..take the manifold off the tractor if you have to mess with it,as was pointed out,you can heat it more evenly.
 
The way I get stubborn steel pipe out of cast is to torch-cut it. First cut off the pipe about 1/2" above cast. Aim the torch down the pipe edge and zap it with oxygen. You will have a nice complete kerf down in the pipe but the cast thread will be unaffected. The 1/2" stub is for starting the oxidizing cut. This all happens very quickly. Don't linger or the cast threads will be affected. Might want to practice on some old cast iron plumbing fittings first. If you make three cuts 120 degrees apart, the pieces will fall out but only one cut is necessary.
 
Appreciate all the good ideas -

I'm going to try more heat first - then probably ccut and peel it out.

I'll be having one of the older 4h kids try it, so, not sure I want to risk the manifold with a cutting torch in their hands.

The manifold is already off the engine.
 
(quoted from post at 08:05:41 10/21/11) Appreciate all the good ideas -

I'm going to try more heat first - then probably ccut and peel it out.

I'll be having one of the older 4h kids try it, so, not sure I want to risk the manifold with a cutting torch in their hands.

The manifold is already off the engine.
Click to expand...

Forget the heat. Just cut and peel. I've done at least 3 Hs using that method.
 
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