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Allis Chalmers Discussion Forum
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want some input on epoxy repairs...

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BCnT

10-19-2005 10:59:18




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i know this is a touchy subject but i've had extremely good luck using an industrial strength JB Weld type product called Devcon...i've used it to repair all kinda stuff including a hole drilled thru #1 cylinder when a buddy of mine was trying to get a broken water pump bolt out...engine was still going strong about 10 years after i fixed it.
as far as diesels go all i am is a parts changer...just curious if anybody has tried anything like this on 262 diesel heads...i believe enuff in the stuff to give it a shot but wondering if theres something i'm overlooking...if it was a gas engine i wouldnt give it a second thought...i'd be mixing
thanx

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Steve in N.J.

10-21-2005 04:31:20




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 Re: want some input on epoxy repairs... in reply to BCnT, 10-19-2005 10:59:18  
I've used JB Weld with great success in everything I repaired with it from peppered fuel tanks, to including cracked Diesel engine blocks. The trick to the repair is getting the area to be repaired ultra clean. Sometimes with a crack, the crack itself may need a little grinding to get better penatration and adhesion of the product. This means making the crack bigger, but in some applications, bigger is better for the repair, and depending on where the crack is located to get to it. The other trick is giving the product enough time to cure before using. My WC has a crack in the side of the engine block, so looks like I'm gonna put the JB to the test again. Best part is, you can sand it and shape it, and once repaired and painted over ya never know the repair was done....
Steve@B&B

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Texas Denny

10-19-2005 11:58:01




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 Re: want some input on epoxy repairs... in reply to BCnT, 10-19-2005 10:59:18  
I just finished a job of trying to seal an oil cooler to an old Volkswagon engine on a three wheeled motorcycle. We tryed three times with JB weld to seal tiny cracks in the aluminum block. Each time, the leak was reduced but never close enough for use. Leaked about a quart in 50 miles the last time. So I cleaned it up as good as I could. The owner scratched the surfaces pretty thoroughly trying to get off the old JB Weld. I built two new parts that sealed inside the block with o-rings and sealed with an o-ring on the oil cooler. It doesn't leak now.

JB weld works for some things but is definitely not for everything. I agree with Soundguy, if the part is scrap anyway, you've got nothing to lose by trying it.

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souNdguy

10-19-2005 11:29:59




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 Re: want some input on epoxy repairs... in reply to BCnT, 10-19-2005 10:59:18  
I know this is not exactly what you are asking.. but i have seen people who have a nick in a head or block deck braze it up, then file down and polish till flush.. then go with it and never had a problem.. same with metal filled epoxy.. the hi-temp stuff like you see for intake manifolds.. I imagine if the repair is sourounde dby metal and away from the cylinder sleave or face.. might be doable... can't hurt to try right?

Soundguy

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BCnT

10-19-2005 13:00:56




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 this stuff... in reply to souNdguy, 10-19-2005 11:29:59  
my Dad turned me onto years ago...he worked for Union Carbide and they used this stuff to build up bearing surfaces in turbines and then turn journals to specs...the metal part reminds me of coarse valve grinding compound or mebbe a lil coarser.
i havent even got tractor tore down yet so i dunno what i'm gonna have to do...just weighing options...i've brazed alot of cast stuff up over the years but nothing that had pressure on it...if head looks real bad i mite go that way...i just like the idea of epoxy cause theres no way to warp head from heat...getting it to flow all the way into a void is anudder ball o string tho

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steve from mo - dangit!

10-20-2005 08:29:00




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 A thought. in reply to BCnT, 10-19-2005 13:00:56  
Getting the stuff all the way into a void might be something you could do with a car windshield repair kit. The vacuum piece should let you create a vacuum that would pull the stuff into the void.



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BCnT

10-21-2005 12:13:53




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 good idea...thanx everybody... in reply to steve from mo - dangit!, 10-20-2005 08:29:00  
when i tear it down i'll let yall know how i fix it and how it holds up



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