Remove it and braze it. I have successfully brazed a couple cast exhaust manifolds, and both held well. But the trick is grinding in a v notch, and getting it hot prior to brazing, and use good flux coated rod. I have a diesel tractor I brazed a few years ago and it was broke clean at the base of the pipe. I ground it off clean, and brazed the pipe to the manifold, and it has been hit by more than one limb and still holding great. If you can find a good used manifold reasonably priced, that would probalby be a better option, but I always enjoy a challenge, especially when it saves a few bucks and nothing to lose by trying. In your case, you will likely know before you reinstall if it works. Trick is to preheat and get it clean and get good flow into the crack. Does not appear to be any stress, so if you can flow it in well, it should work.
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Today's Featured Article - Machine Shops - by Curtis Von Fange. It is a story that repeats itself countless times. In the process of rebuilding a particular section of the tractor there is a broken part for which a replacement cannot be found. The parts houses find in their catalogue that it is unavailable. The dealerships call it a discontinued part. Salvage yards define it as hard to find or, even worse, rare. Everyone on the NET says, 'what is it?' But don�t despair there is another avenue that can be used to get that piece repaired. The local mach
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