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Tool Talk Discussion Forum

Cracked block

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Don

03-20-2004 16:39:52




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Is there anything new on the market far repairing a cracked block?Tried JB weld.It held for a short time & THEN LET GO. Thanks, Don.




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Fred P........

03-22-2004 09:42:08




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 Re: Cracked block in reply to Don, 03-20-2004 16:39:52  
Water glass will sometimes work. We fixed a old chev 6 with a 12" crack 3/8 wide. Pounded the crack full of steel wool and filled it full of water glass. It has a white stain on the side of the engine, but did not leak. It seems like we ran the car for about a year after the patch. It is not the way that I would like to see a new BMW fixed but it works. If you can not get the JB weld in the crack it will just peel off. If it is where you can get to it you may be able to weld it. Most of the time when CI is welded people like to use a lot of pre and post heat. Sometimes you can weld CI with little heat. Use CI rod. Weld about one inch, peen the weld good and let cool then weld and peen one more inch till it is done. Never let it get hot. Good luck

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Farmaller

03-21-2004 08:14:27




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 Re: Cracked block in reply to Don, 03-20-2004 16:39:52  
The best thing I found is a product called Oatey Epoxy in the plumbing department at Lowes stores. It comes in a round tube and you mix it together. When it hardens it is like cast iron.



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John *.?-!.* cub owner

03-21-2004 07:17:16




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 Re: Cracked block in reply to Don, 03-20-2004 16:39:52  
Take a look at this link



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Wayne

03-20-2004 22:21:41




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 Re: Cracked block in reply to Don, 03-20-2004 16:39:52  
JB Weld is severely over rated..... If the crack is to the outside you can use one of the Devcon epoxies. Now if it's somewhere other than a water jacket, etc then you may have a situation where nothing you use is gonna last....There are many different types of epoxy so my suggestion would be to call Devcon directly and get their recomendation. You should be able to get their number either online or call a supplier, like Graingers tech support, number and they should be happy to give you the number. We fixed a crack in the water jacket on a 4219 Deere, in an IR air compressor, about 5 years ago and it hasn't leaked yet. When I was in the Navy we also used Devcon to repair leaks in piping systems that were under alot more pressure than a radiator is ever gonna be and never had any problems with the repairs. Just remember to V out the crack to give the epoxie a good bed to seat and seal in, and to drill a small hole at each end of the crack to keep it from running before you apply the epoxy.

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Rob

03-20-2004 16:44:35




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 Re: Cracked block in reply to Don, 03-20-2004 16:39:52  
What kind of block is it? what is it in/on, how many cylinders, what kind of fuel gas or diesel?



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wdTom

03-20-2004 17:58:21




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 Re: Re: Cracked block in reply to Rob, 03-20-2004 16:44:35  
And where is the crack? and how big is it?



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