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Tool Talk Discussion Forum

Liquid Steel or ?? for leak sealing external crack

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Truck

05-13-2005 10:24:18




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I have a jeep engine that runs well but it has had the usual cracking below the distributor in the waterjacket. Someone did a brazing repair, and there is seepage when the engine is run.The engine has been run this way for years, just keeping an eye on the coolant. I have the engine out but do not want to do a complete disassembly to reweld/ pin/whatever the crack. There has already been too much working of the crack area and I am afraid of opening up a real can of worms. I remember there was some sort of epoxy repair on some of the remanufactured engines we used to install.. WHat was it called?

And I don't trust JB weld in this application, need something a little better.

Suggestions anyone?

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buickanddeere

05-14-2005 06:48:40




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
The external goober fixes are at best a temporary fix to get you home or finished planting your crops. You will never regrete doing a proper repair and not having the problem return.



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rockyhawaii

05-14-2005 00:24:45




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
I've used Devcon with good results. I also had a nasty crack in a 1947 Jeep block. This is how it was repaired. A hole was drilled at each end of the crack, to keep it from spreading. Then a torch was used to heat the area to be welded, and it was welded with cast iron rods. Then it was "cooled down" with the torch again. I guess it's somewhat of an art known only by old farmers.



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dan67

05-13-2005 18:53:02




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
There is a product called Marine-tex is"s sold in marine stores. Lot better than JB Weld but you still have to clean the area. Good stuff



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Johnski

05-13-2005 16:26:08




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
I had an old Autocar with a 335 cummins in it that had a large crack in the block welded. An old school trick is to lay a bead of solder over the weld to seal it. Clean it up, flux it good and use 50/50 solder. You don"t need very much heat and it will last forever. ;>)



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Davis In SC

05-13-2005 19:56:14




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Johnski, 05-13-2005 16:26:08  
At an auction a few years ago, there was on OLD Autocar they were gonna sell. It was in sad shape one of the doors had rusted away at the hinges, & was sitting on the ground leaned against the tire. It had a Recon Cummins in it, it sat idling the entire day of the sale.... It was a noble old truck, I hope it found a good home..... This sounds silly, but some how it kinda struck a soft spot with me...

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Redmud

05-13-2005 13:59:48




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
Truck, can you post a picture of the crack.



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Truck

05-13-2005 14:25:51




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 Sorry, pics broken.. in reply to Redmud, 05-13-2005 13:59:48  
I can't do pictures right now as the computer floppy is not cooperating...BUt it is basically a 4 inch long by 2 inch high area with a horizontal line where the antifreeze has been seeping out while the engine is running. It is in a non structureal part of the water jacket on the vertical side of the block. It looks as if someone wasn't too good at brazing or cleaning the surface before they brazed, and they attempted to coat the whole area with braze. They didn't drill the ends of the crack as far as I can tell. All the brrass makes welding it a tough job, and it would be a lot to pin as well. It had been used this way for the last ten years, so I am hoping I can clean the surface with grinding or spot blasting with a vac sandblaster, and that applying a thin even layer of Devcon will fix it for a good long time.

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Redmud

05-13-2005 15:34:59




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 Re: Sorry, pics broken.. in reply to Truck, 05-13-2005 14:25:51  
Truck, is the crack on a flat surface of the block? or some what flat? and do you have about 1/2 inch above and below, and at each end of the crack?



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Truck

05-14-2005 04:41:27




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 Re: Sorry, pics broken.. in reply to Redmud, 05-13-2005 15:34:59  
Relatively flat, there are some 1/16th by about an inch wide ribs in the block it goes thru.



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supergrumpy

05-13-2005 11:17:49




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 Re: Liquid Steel or ?? for leak sealing external c in reply to Truck, 05-13-2005 10:24:18  
don't trust JB Weld!!!!!

that stuff does wonders if you get the area clean



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lucasss

05-13-2005 13:34:37




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 Re: Liquid Steel or ?? for leak sealing external c in reply to supergrumpy, 05-13-2005 11:17:49  
ive used deavcon plastic steel putty for cracks, and like it.i get it from gemplers.com,,, lucas



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Jerry Cent. Mi.

05-13-2005 15:25:07




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 Re: Liquid Steel or ?? for leak sealing external c in reply to lucasss, 05-13-2005 13:34:37  
I use PC-7 and it works great as it don't setup as fast as JB weld and it is harder. Ace or HWI hardware stores handle it. Its costly for small jobs but you only use a small part of the can and fix many other jobs. I use it a lot and my one $15.00 purchase has lasted several years.



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