Re: JB Weld repair??

Posted by Chris-se-Ill on September 11, 2003 at 19:41:29 from (216.174.170.194):

In Reply to: JB Weld repair?? posted by Trevor on September 11, 2003 at 12:44:43:

I do not believe that the JB Weld will do you any good for an exhaust manifold. I have used JBW extensively on all sorts of applications {some I shouldn't have}.

Two different things you might try....

I used to work in an automotive repair shop 24 years ago.... we had a way to seal cracks in cylinder heads. We had some tapered taps and cast-iron plugs. We would drill the crack, tap it, and insert a cast iron plug {screw in} with a thin coating of a resin sealer (valve seat glue). Then after the resin glue set, we would grind off the plug flush with the head. I do not know if these tapered cast plugs are even available anymore... but an old automotive machine shop might help you out!

Second option...
The "old timers" used to fix pin holes and such in the big old cast-iron kettles with a piece of pure copper! I have done this and it really works!!! I had an old cast iron kettle that had several pin holes in it. I took a piece of heavy copper wire and {basically} riveted the copper into the hole {after cleaning all debris/rust out of the hole}. Just be careful that the hammer {and it does not take a Big Hammer either} hits the copper only... and not any part of the casting. The copper is mallable enough to fill the odd shape of the pinhole as it swedges out. This method seals the pinhole real well and the heat will not melt the copper... also after a while the copper discolors and you can't detect the difference in color.

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