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Farmall & IHC Tractors Discussion Forum
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Exhaust pipe H

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GordoSD

07-19-2005 10:26:41




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I have been soaking the manifold/exhaust pipe connection for a week now, but still can't unscrew the d..... thing. Time for the "blue wrench"? If there is not another way, where would you apply the heat? Pipe or manifold? Both? then let them cool and try removing? Anybody ever cut it off flush and then try cutting slot thru pipe? How deep (long) is the threaded section down in there? Want to install new chromed pipe.

GordoSD

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Larry Martin

07-19-2005 18:41:12




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 Re: Exhaust pipe H in reply to GordoSD, 07-19-2005 10:26:41  
Take it from an old retired pipefitter, the safest way is to saw the pie off flush with the manifold with a sawzall. Then saw 2 slots in the remaining pipe in the manifold almost into the threads of the manifold. Take a small chisel and gently collapse the section that you cut the notches in. Then remove the remainder. You may need a 2" pipe tap to clean up the threads in the manifold when you are done. Should find oe at your local plumber.

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El Toro

07-19-2005 17:01:25




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 Re: Exhaust pipe H in reply to GordoSD, 07-19-2005 10:26:41  
I would agree with Jim on using a cutting torch.
It will put the heat where it is needed. Most muffler shops will use a torch to remove seized rusty studs from an exhaust manifold. Just don't squeeze the trigger when heating. Applying anti-seize to the new pipe is a good idea too. I even use it on wheel lugs. Hal



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RustyFarmall

07-19-2005 12:37:16




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 Re: Exhaust pipe H in reply to GordoSD, 07-19-2005 10:26:41  
Gordon, I assume that the pipe needs replacing? If so, the easiest way I have found is to use a blunt punch or other device. Place the punch against the pipe right down on top of the manifold, and start beating with a hammer. The goal is to collapse the pipe inward. Once you have made it about half way around the pipe should then unscrew.



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Randy in NE

07-19-2005 11:04:10




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 Re: Exhaust pipe H in reply to GordoSD, 07-19-2005 10:26:41  
When I was trying to get some pieces apart for my plow my brother applied heat to just one side of the bolt and burr. He said it worked better that way. I would apply it to one side of the manifold and let it get good and hot. It might take a couple of heatings and cooling downs. I would heat a different side each time that you heated it up. I would think that that would break the rust. You could heat everything up and then emerse the pipe in a bucket of cold water. That would cause the pipe to contract and the manifold to stay hot and expanded. I would try not to dip the manifold in the water. I am sure that others will jump in with other suggestions.

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Janicholson

07-19-2005 12:30:13




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 Re: Exhaust pipe H in reply to Randy in NE, 07-19-2005 11:04:10  
Heat will be useful. Heating Cast iron is not a problem if done with the understanding that even heat is going to swell up all parts uniformly, and uneven heat can crack C.I.
Needed stuff Small rosebud tip for oxy/fuel torch (or cutting tip not using the blow trigger), A 2" pan for water, a piece of ~2" bar stock (or an old disposable socket that thick, a bench vice to hold the MFD for final removal, a pipe wrench and 3' pipe handle extender, luck (bushels)
I'd cut off the existing pipe about 2" from the joint, heat the manifold (at and 2-3" around the exhaust stack joint with oxy/gas torch till it is near red hot. Then, using gloves, I'd submerge about 1" of the existing pipe (no part of the cast should touch water, and there will be steam!)in the shallow pan of water to cool it. This causes the greatest difference in contraction and expansion possible. The cooling should only be done for 10-15 seconds so as not to cool the casting much. With haste and caution place the manifold in the bench vice and put the bar or socket or? inside the pipe to keep it from crushing when using the pipe wrench to unscrew the threads.
When going together use silver molybdenum disulfide anti-seize compound. NAPA sells it Permatex brand is good.
Good luck, and remember to watch out for the steam.
Jim Nicholson

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