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Tool Talk Discussion Forum

repairing aluminum crack

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ja05401

07-16-2006 17:18:00




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Have a newer 5.5hp briggs horizontal on a troy-bilt tiller. It developed a crack at the edge of the oil drain hole....maybe I tightened the oil plug too much. It looks like an aluminum block. Can it be welded/fixed?




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MikeCatthemuseum

07-16-2006 21:27:59




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 Re: repairing aluminum crack in reply to ja05401, 07-16-2006 17:18:00  
The main thing, as has been mentioned, is to get it oil-free no matter what you use. I really don't think you'll have much luck TIG welding it back up unless you take it apart. The fumes from the heated oil film inside the engine are going to make it a lousy weld.



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Randyr

07-16-2006 18:56:44




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 Re: repairing aluminum crack in reply to ja05401, 07-16-2006 17:18:00  
I had a crack on an aluminum wheel on the very outside edge and I used a product called Metal-Set A4. It's an epoxy with aluminum in it that I have seen used to fix cracked bearing box housings on industrial pumps and compressors of 100 horsepower and more. It has held up good for them for many years (25) and is still good on my wheel. You would have to get it at an industrial supply place, I guess.
Here's their website:>Link
Hope>Link this helps.

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Randyr

07-16-2006 19:04:19




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 Re: repairing aluminum crack in reply to Randyr, 07-16-2006 18:56:44  
I forgot, click on "epoxy adhesives" on their website.



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`Bernie in MA

07-16-2006 18:45:47




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 Re: repairing aluminum crack in reply to ja05401, 07-16-2006 17:18:00  
I've welded quite a few aluminum blocks, don't remember doing one into the plug hole. It's hard to get the oil out of the metal to get them clean. Perc (short name for the stuff that used to be in Brakleen) works good but it's not in it anymore. It's the same stuff used in drycleaning machines if you know of a place that will give you some. I'd vee out into the side of the hole and put a steel bolt in it. The weld won't fuse to the bolt so you could wrench it out and hopefully still have your threads. Otherwise totally fill the hole and make a new one in another spot. You might have to build it up a little to get enough threads. I'm mostly retired now, welded aluminum for over 30 years.

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ldj

07-16-2006 18:44:15




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 Re: repairing aluminum crack in reply to ja05401, 07-16-2006 17:18:00  
Are you sure it is a crack? is it leaking? sometime there are marks, imperfections in the casting that looks like a crack. If it is a crank and it is leaking, I would clean it real good and try to stuff JB Weld in it and let it build up a little on the surface to stop the leak. That isn't a stress point. If you think it is a crack but it isn't leaking, I would do nothing but keep an eye on it. Just don't tighten it so tight, not necessary, just snug it good with fingers.
L.D.

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