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Any suggestions on separating these for reuse?

mvphoto13774.jpg
 
If you are new to YT you cannot post images unless you ask the moderators. Feedback Forum to the left. This prevents the posting
of nasty images. They will respond rapidly to your request. Jim
 
Cool the manifold at the flange with wet (soaked) rags, and heat the elbow on its flange with an Oxy-acetylene torch. This will
shear the connection between them. Jim
 
Hopefully you have access to an oxy-accetylene torch.

Heat the area around each of the three studs red hot, allow to cool to ambient temp.

Heat the area around each of the three studs red hot, allow to cool to ambient temp.

Heat the area around each of the three studs red hot, allow to cool to ambient temp.

At this point it should fall off of the studs with little or no effort.
 
You can also use another trick if you want to try it. You can make the
manifold flange extra cold and heat the pipe. This pretty much agrees
with the other guys. Here is how you can get the manifold really
cool. Get a couple of cans of that dry air stuff for computers. Turn
the cans upside down. It will spray out straight refrigerant. Very
cold. You should not need to heat your pipe so red hot this way. Did
it this way on a lawn tractor muffler and it almost just fell off. Try
at your own risk. Great way to freeze in bushings and bearings. If you
have one of those do it yourself AC fixit recharge gizmos with 134a
that will work even better. Just take precautions not to get freeze
burn. Frostbite. Happens VERY quickly. One other thing. Gently clamp
in a vice and see if you can gently cut just a little around the
center joint with a hacksaw blade. Just scratch it. Then use a good
penitrating oil. Might just release after a soak. Just my 2 cents.
 
This Bob agrees. A neighbor brought me a similar situation on a Case VAC. He had busted the part where the muffler mounts, and wanted me to weld his exhaust manifold, citing another old neighbor, who could weld anything. When I saw that the exhaust elbow was a separate piece from the manifold, I said I will see if I can get it loose, and replace with a new part. Heat was my friend.
 
I've had the best luck separating that
stuff using a small air hammer, if that is
not available a small regular hammer. Just
keep tapping it, breaking the rust loose,
til it separates. A small hammer so you get
vibration rather than force.
 
I agree jon but didn't want to say it. Tapping with a little hammer is an art. He must understand it is tap.tap and. NEVer TAPPEDY TAP TAP. Just saying no ill intended.
 
I'd heat the flange around the studs red hot, take a break until it cools off and then rattle it with an air chisel.
 
Do not spray any type of penetrating oil or anything else like that on it. Then lightly tap on it and blow air around the pipe. Try wiggling the pipe too. What your hoping to do is get the rust to start to come out. It will blow out as a dust if you have not put some type of oil/lubricant on it. Some times none of this will work. I then take a cut off wheel and split the pipe over the manifold. This will usually relieve enough pressure that you can start to get it to move. IF you do not run the cut too long down the pipe you can just clamp it back like it was originally. If you cut it too deep then just weld it shut. I then usually stretch the pipe out just a little. I have tool that does that with a draw bolt. If the pipe is off the engine I slip it over the horn on my anvil and do the same thing.
 
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