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Old 05-08-2013, 11:38 PM   #1
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Crack on Dana 44

I just bought a used dana 44 and didnt realize till when i got home that there was a little crack on the bottom of the pumpkin that had been jb welded on the inside and outside.

any suggestions on how to fix it or get rid of it? i was thinking that i could weld it?

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Old 05-09-2013, 08:07 AM   #2
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Quote:
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I just bought a used dana 44 and didnt realize till when i got home that there was a little crack on the bottom of the pumpkin that had been jb welded on the inside and outside.

any suggestions on how to fix it or get rid of it? i was thinking that i could weld it?
You can weld it just fine. Take a die grinder and grind out the outside crack to a V and fill it with a Mig welder and standard wire. That will burn off the stuff on the inside and just run a patch cover pass over that after wire brushing it. Don't fast cool it, but don't bury it in sand or anything to slow cool it either. Set it someplace out of the wind and let it cool naturally.

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Old 05-09-2013, 09:05 AM   #3
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I agree. Preheat the area to be welded with a torch to 250-300° before striking the arc.
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Old 05-09-2013, 03:51 PM   #4
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You could also strip the paint and do a liquid penetrant test to see exactly how far the crack goes. You could does this after the repair as well.
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Old 05-09-2013, 05:34 PM   #5
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thanks guys, im gonna give it a whirl. also what does heating it up to 250 to 300 do for it? sorry little new to this haha
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Old 05-09-2013, 06:12 PM   #6
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thanks guys, im gonna give it a whirl. also what does heating it up to 250 to 300 do for it? sorry little new to this haha
In short, it reduces the potential for embrittlement .
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Old 05-09-2013, 06:26 PM   #7
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Okay gotcha. Thanks!
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Old 05-09-2013, 09:55 PM   #8
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thanks guys, im gonna give it a whirl. also what does heating it up to 250 to 300 do for it? sorry little new to this haha
On most cast, it makes it a tad bit easier to weld and drives the moisture out of the cast ferrous.

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