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Tool Talk Discussion Forum

JB weld questions

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Hurst

08-20-2005 18:58:17




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I put a coat of jb weld on a crack in the oil pan of my 7000, which had a previous braze on the inside, so I applied the jb on the outside since the pan was already on. I drained the oil, used a wire brush, drill brush, brake cleaner and a blow torch (burn away silicone I used earlier) to prep it. I put the jb in a patch atleast 1/2 inch from the crack. I had some drips on it, so I was wondering if I should file these down. Also, should I file the whole thing lightly to get a good rough surface and apply another coat when I get a chance? Thanks

Hurst

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lucasss

08-21-2005 18:42:32




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  

brazing would be best, . epoxie wise i would use devcon plastic steel putty.gemplers.com has it.a pound is about 25.00 lucas



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Case450

08-21-2005 18:29:23




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
I have used JB weld in the past and it's never worked for me. I have since bought a small mig welder from canadian tire for three hundred bucks. It plugs into a standard house outlet. I figure that if a crack is small enough for JB weld I can weld it with the little mig. Now i dont have to worry if it's fully bonded or deterioration. Just my two cents.



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RandyB

08-21-2005 15:46:30




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
Click the link below for a little more information



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Weirsdale George

08-21-2005 10:42:59




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
I would file off any rough drools and such. Then I would lightly sandblast the existing JB Weld and the adjoining area of the pan. Clean with lacquer thinner and coat with more JB Weld.



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HBR

08-20-2005 22:18:00




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
JB weld is a good product if the to be fix is not a stress area,leaks can be stopped if used properly but it will take at least three applications. Clean the area good with mineral spirits or paint thinner and let dry. Sand with course emery paper and not sand paper or wire brush and then clean again with mineral spirits or paint thinner. Let it dry good and then apply your JB to crack only. Wait at least 24 hours,best 48,clean,resand,clean,let dry,and apply again. Second application spread beyond crack. Third application make your spread overlap and further away from crack . The secret is cleaning and drying time. Of course you could get another oil pan.

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RandyB

08-20-2005 19:54:09




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
I am not too fond of JB weld as my experience has always been that it worked loose from the base surface (oil pan in your case) and not because it was not thick enough. I did about what you are trying one time and it lasted about one year and the oil migrated inbetween the metal and the JB weld and it just peeled off. I am not an expert this is just for information



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Hurst

08-20-2005 20:57:55




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 Re: JB weld questions in reply to RandyB, 08-20-2005 19:54:09  
A year will work great for me, by then I can take the pan off and get it re brazed or have it wire welded on the outside. If it holds, I am going to leave it alone until it needs fixing again. If it aint broke dont fix it. :)

Hurst



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Logan

08-20-2005 19:28:56




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 Re: JB weld questions in reply to Hurst, 08-20-2005 18:58:17  
Hurst, its better to be safe than sorry, i would rough it up and apply another coat, then if you still have doubts, do it again. My honda 3-wheeler gas tank sprung a leak all over my leg one day, i used 2 coats of JB weld...been holding for me.



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Hurst

08-20-2005 19:36:54




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 Re: JB weld questions in reply to Logan, 08-20-2005 19:28:56  
Is there a possibility of ripping off the jb? I would hate to lose all the work I have already done, but if there is not a risk of ripping it off then I would like it to be as strong as possible. Thanks

Hurst



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Little Ed

08-23-2005 18:38:20




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 Re: JB weld questions in reply to Hurst, 08-20-2005 19:36:54  
If the JB comes off when you are trying to sand it, it wouldn't have held anyway. Best to find out now.



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