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Welding manifolds

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Kyle

03-22-2000 16:13:33

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I have an AC "G" and the exhaust manifold is cracked where the muffler threads into the manifold. I'd like to reuse it but need
advise. Local welding shop is against welding it; would JB Weld work? Any suggestions are appreciated. Thanks, Kyle

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D13

03-24-2000 15:55:28

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Re: Welding manifolds in reply to Kyle, 03-22-2000 16:13:33

Figure out how to hold the mainfold in the position you want. Clean the manifold as well as you can - I sandblast on a dry day then store in a sealed plastic bag until the fateful day. Wait until the wife is going to be gone for a couple of hours (they get upset about baking parts)(cleaning well before baking helps limit the "burnt Grease" smell - evades the "what's that burning smell?" question). Set the oven to 350-400, put the manifold in, and wait about half an hour. During this time, get your brazing equipment ready to go, and have the hodling set-up ready. Turn off the oven (important to keep out of family trouble), put on you welding gear, haul the part out, and go at it. After you're done, smooth off the braze if necessary, a light cleaning / sandblasting followed by high-temp paint (black header enamel works good for me), and only very close inspection will reveal your excellent repair. And if you booger it up, just remember we all have things fail, and the darn thing was broke when you started anyways.

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Brian G.

03-25-2000 05:20:01

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Re: Re: Welding manifolds in reply to D13, 03-24-2000 15:55:28

It's not a bad idea to wrap it in a thick layer of fibreglass insulation and let it cool down slowly. Or.... you can stick it back in the hot oven and let it cool down with the oven.

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Bill in Mich

03-22-2000 22:57:10

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Re: Welding manifolds in reply to Kyle, 03-22-2000 16:13:33

If I remember right JB weld is only good up to 600 degrees so it might not hold to long , Bill

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Rick

03-22-2000 21:03:51

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Re: Welding manifolds in reply to Kyle, 03-22-2000 16:13:33

From past experience you would be better off to replace the manifold,Weld on these old manifolds will not hold up,that is if you planing on keeping it for a while,on the other hand if you are going to sell in the future patch it.

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Terry (NC)

03-22-2000 17:00:15

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Re: Welding manifolds in reply to Kyle, 03-22-2000 16:13:33

Why won't the local shop do it? Maybe they are inexperienced. I've been welding for about 24 years and welding cast used to scare the heck out of me. It is much more difficult. Well, I got over that about 19 years ago.

There are generally two ways to weld cast iron, Nickel arc or brazing. (Actually I Arc welded a head with stainless steel one time and it worked well but I was in the middle of a big desert in Saudia Arabia and didn't have many options. It worked well). Most of the time I prefer to use nickel (for many reasons) but in your case I would braze it. This sounds like a low stress location and actually should be fairly easy. The key is metal preparation and knowing that, the local welding shop is probably tenative because your manifold looks like most, heavy in rust.

I think JB weld is miracle stuff but I only use it as a last resort (I can count the number of times on one hand).

Solution: Either bring it to Hope Mills, NC and I'll do it for you or find another welding shop.

Good luck. Terry

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Brian G.

03-23-2000 05:49:13

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Re: Re: Welding manifolds in reply to Terry (NC), 03-22-2000 17:00:15

Someone on one of these sites suggested "Pyro-Putty" which (I guess) is something like J-B Weld but will withstand much higher temperatures. Repairing exhaust manifolds is one of the recommended uses. It is manufactured by aremco.com and one of their dealers is caswellplating.com.

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Carroll Porter

03-23-2000 17:35:03

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Re: Re: Re: Welding manifolds in reply to Brian G., 03-23-2000 05:49:13

Terry NC has his head on straight. Pre-heat your manifold in a 350 degree oven and braze it. CP

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