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Muffler Removal?

C

Clarkbug

Member
Question for those who have done this before...

I have a 1951 H that has an IH muffler on it, which I guess is somewhat rare from what I have read. Its stuck tight to the pipe coming out of the manifold, and I need to get it off so I can tinker with the bits that are under the hood. (This H always starts right up, but just doesnt sound right....something is wrong with it and Im not sure what)

I dont want to destroy this muffler, since it is in nice shape, but I have no idea how to get it off. Ive tried prying on the bottom of the metal where it slips over the pipe, using PB Blaster, and some heat from a propane torch. No dice.

Any ideas?
 
El Toro is right, it will require flame control to reduce visible damage to the aluminized finish, but it will come off. If it was shoved on more than the length of the bottom nipple sticking out of the body, it may not come off at all. Pecking at it with a ball end of a ballpeen hammer will also help get it off. If the black iron pipe now threaded into the exhaust manifold has been out recently, you could unscrew the whole assembly! if it is rusted in, you risk breaking it off both from pecking at it, and twisting on it. Also the blue flame approach with Acetylene, is tough on hood paint, use wet canvas or a tin and wet cardboard to protect the hood and watch the applied heat. Good luck, and just how much is that muffler worth. JimN
 
Hmmm....

I guess I better put a torch on my Christmas list then. I dont have one of those as of yet, but Im sure Ill need it sooner rather than later. (this appears to be sooner)

I dont know if that muffler is worth anything more than a replacement I can buy at the store, I just hate to wreck something that still looks good and works like it should.

I cant screw the pipe out of the manifold, I tried that one already (and thats how I get the pipe out of my M :) ) Maybe a little more heat and a strap wrench will twist the pipe or the muffler some.

Thanks for the input!
 
Two chain wrenches put on 180 from each other with two people using 3 foot pipe cheaters on the wrench handles might do it. The two wrenches keep the side load on the pipe from breaking it off. The effort might also loosen the rust holding the muff on. JimN
 
Have no idea really. But, a suggestion to ponder. Could you cut through the exhaust pipe, below the muffler, (sawsall, etc.) so the muffler could be removed and allow for the hood to slip past the pipe still coming through the hood? Then reinstall by brazing (welding) the exhaust pipe ends together after putting the hood back on.
 
Clark, just my opinion, but if that original "IH" muffler is in good shape, and if you can remove it without damage, I think I would replace it with a new "generic" muffler, and add the old one to you collection of IH stuff. You may even be able to sell it for more than the cost of the replacement. Also, once you own or have access to the use of a torch, you will wonder how you ever got along without it.
 
Take a look at the under side and see if the exhaust pipe welded to the manifold. If it is not, try unsrewing the whole assembly from the manifold.
 
Might try some thin penetrating oil or rust buster around the flange if you can get to it. Don't know how penetrating oil would do down the muffler--most of it would probably end up in the manifold.
 
Have you tried rocking it (while cool) within reason of course, by gripping the upper/outlet part of the pipe?

I took the muffler off my Super A exactly as such to reduce the height since it is living under a tarp this winter.

I did soak with PB B'laster first.

IMHO it is a good idea to eventually take the black pipe out of the manifold and reinstall with anti-seize. That way you can go straight pipe :cool:
 
Does the propane torch get the metal red hot as thats the only way you will get the muffler loose as irs probably rusted fast if not welded fast. If you want to remove the pipe from the manifold you will need more than a propane torch as it will have to be pretty red hot to get the pipe to unscrew then a large pipe wrench to turn loose an oxy-ace torch it what you need.
 
I definitely didnt heat things red hot.

It looks like time and rust are the things holding the muffler to the pipe in the manifold. I havent even tried to get that out, since I didnt see the point in that just yet.

Ill have to try some more penetrating oil and a LOT more heat to see if thats the ticket. Thanks for all the ideas so far fellows!
 
My SA had a short length of black pipe screwed into the manifold, and the mufflet set down on that and clamped to it. The pipe was so rusted to the manifold, that at first I thought it was one piece. I couldn"t budge it of course, and didn"t want to ruin the manifold with too much heat. So, I cut if off with a hack saw about 1/4" above the manifold. I took a punch and tapped the top inward to break it loose from the top threads, to let a penatrant soak into the threads. Still wouldn"t break loose. I finally took my cutting torch, and heated the pipe inside the threads just hot enough to start a cut and quickly sliced down an inch or so. While it was still orange, I got on it with a big pair of pliers and peeled it out from the inside. The torch didn"t bother the threads because they were cast iron, and the pipe is mild steel. I think the poster above might have a good idea using anti-sieze when replacing this pipe.
 
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