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Cracked block and Jbweld

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Harvey

09-18-2001 20:56:37




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My 420C came with a cracked block that had been badly repaired. The crack had been arc welded but continues to seep. I have seen products which are epoxy based that claim to be made for just this kind of repair. Has anyone any experience with this? what can I expect?




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Harvey

09-19-2001 22:01:08




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 Re: cracked block and Jbweld in reply to Harvey, 09-18-2001 20:56:37  
Thanks for the comments. I guess that I was about to try it anyway but am more encouraged about the possible results now.



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Frank-in-Tallahassee

09-19-2001 08:53:20




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 Re: cracked block and Jbweld in reply to Harvey, 09-18-2001 20:56:37  
Harvey:

Years ago, I sealed a brazed crack in an "H" outer water jacket (no pressure, full antifrezze) using Devcon Plastic Steel. It worked well, but today I feel that JB Weld gives better results with a better sandability.

Like the others said, the cleaner the better. To that end, if you have access to a small sand blaster, that would be really effective in both cleaning the weld area of flux, and well as giving a tooth to the surrounding surface.

Where I have prepped a surface like this, I seldom seen a failure.

Frank-in-Tallahassee
70D // 855

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Mark A

09-19-2001 07:11:22




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 Re: cracked block and Jbweld in reply to Harvey, 09-18-2001 20:56:37  
Depending on the stress on the crack and the size of it, JB WELD should work. But it is important to get it super clean. JB WELD can even be machined in some instances. (No I am not a JB WELD salesman).



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rod

09-19-2001 03:36:17




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 Re: cracked block and Jbweld in reply to Harvey, 09-18-2001 20:56:37  
I used it on a 990 David Brown but have not got it running yet you got to get it super clean grind it out and then wipe down with lacquer thinner or brake cleaner to get oil off the block then JB Weld and let dry a few days. It is worth trying and if it still seeps I would put block sealer in it also. I talked to a marine diesel mechanic he said they patched a fishing trawler engine with it and ran it 3 years till the engine finally was replaced so it must work.
regards
rod

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