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Discussion Forum

J.B. Weld

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MGM

02-03-2003 06:49:15




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May I please get your opinions on using J.B.Weld on a block with a hairline fracture. This is going to be used for a crack on the cooling system. Low pressure
Thanks
MGM




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MGM

02-05-2003 03:03:12




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 Re: J.B. Weld in reply to MGM, 02-03-2003 06:49:15  
Gentlemen
After dozens of mixed reviews which were all very good I have talked to a professional welder. As you all know cast iron is very difficult to weld. He stated that because cast iron is very pourous that the J.B. weld will sink into the metal, not a bad thing but hard to clean out when welded. We are going to preheat to 600 and use an infra red thermometer to check temp then clean and ni cad weld. Im sure I will sleep better at night knowing I did everything I could to fix this right. I have read several comments ranging from dont worry to worry. One guy stated that he fixed a block over 4 years ago and still running strong with J.B. weld. Thanks to all of you for your support. Worrying got the best of me.
MGM

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Ron in Nebr

02-04-2003 17:07:19




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 Re: J.B. Weld in reply to MGM, 02-03-2003 06:49:15  
In high school I rebuilt a 340 IH tractor that had a hairline crack on the outside of the block. I took it to a welding shop to get welded, and they said just to clean it up real good and cover the crack with silicone gasket sealer. I did, and it worked great and stayed put with no leaks for several years until we sold the tractor. So, I'd say that if silicon would work, then J-B Weld would work even better. A trick another pro welder taught me was to heat the area of a crack up before applying J-B Weld, and the J-B will flow into the crack and create an even better bond. I even know of racing engine builders who use J-B Weld on non-stressed cracks. So I don't think you'll have any trouble. It's good stuff.

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george md

02-04-2003 20:31:07




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 Re: Re: J.B. Weld in reply to Ron in Nebr, 02-04-2003 17:07:19  
Ron ,

He said the block was cracked in the webbing between # 3+4 liners , that is a hi stress area . It has to help support the liners , if it doesn't he looses the crush on the gasket and this will be a failure shortly . he needs weld not houckempucky.

george



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Ron in Nebr

02-11-2003 09:59:24




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 Re: Re: Re: J.B. Weld in reply to george md , 02-04-2003 20:31:07  
George, It clearly says in the first post on this topic that the crack is in a low pressure cooling system area. Says nothing about a main web crack.



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Gary

02-03-2003 14:25:16




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 Re: J.B. Weld in reply to MGM, 02-03-2003 06:49:15  
MGM
I used JB Weld On the top of a diesel block, It had blown the head gasket and etched the block a few thousandths. I also put in some high quality gaskets. Everything is still holding a few thousand miles later. I talked to the manager of the shop that rebuilt the heads and he told me that it had been done before and worked.



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JT

02-03-2003 11:01:57




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 Re: J.B. Weld in reply to MGM, 02-03-2003 06:49:15  
I use JB Weld a LOT for different things but I would not trust it for a minute on something like that. It might hold a while but I guarantee you that it will fail probably sooner than later.

On a cast iron block crack the best thing to do is take it to someone who KNOWS WHAT THEY ARE DOING and get it brazed. If it is done right it will be there from now on. If not, you might as well use JB Weld.

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