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Crank nose repair question
by
jimfoo
on 29 Jan, 2008 17:26
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I had the machine shop work on my crank so I could fit a TDI gear. The shop built up the whole crank for a tight fit, then ground the flat, but they didn't fill in the old slot. Is this going to be a problem? I imagine I could weld it up myself as the hardest part has been done, if it really needs it.
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#1
by
wyldman
on 29 Jan, 2008 19:05
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I always weld them up first,then machine to fit.
I wouldn't weld it now,or you will need to remachine.
Check it for hairline cracks right around the keyway.If there are any,I'd be getting it fixed.
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#2
by
jimfoo
on 29 Jan, 2008 19:11
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Well, I guess it would be hard for it to fail in the same manner. It is a good tight fit. Maybe I'll just JB Weld it as that can't hurt. I don't see any cracks, so I guess it isn't too bad.
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#3
by
wyldman
on 29 Jan, 2008 19:15
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Did they magnaflux it ? Sometimes you cannot see the cracks.
Where did they machine the flat ? Is it 180 degrees away from the original keyway ? If so,you should be OK.I would not use any JB weld.
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#4
by
jimfoo
on 29 Jan, 2008 19:18
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Nope, it's where the original keyway was. maybe I could make my own flat on the other side.
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#5
by
wyldman
on 29 Jan, 2008 19:20
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Hmmm....
I have seen a few done like that and they later cracked.
You might want to consider welding it up properly,and remaching it.
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#6
by
935racer
on 29 Jan, 2008 21:39
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If they machined the flat on top of the old key way it should be redone, I machine the flat 180 out from there all the time given the crank nose isn't damaged yet. If it is it gets welded up and re machined.
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#7
by
jimfoo
on 30 Jan, 2008 10:48
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Ok, I welded it up, about 3-4 times, and carefully ground it down, about 3-4 times, until I got it. It is now a tight press fit, I need to use the bolt to snug it up, and it has no movement. I can see where a mill or bridgeport would be very handy. I had to settle for a dremel, a very steady hand, and a very slow cutting diamond disc.
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#8
by
burn_your_money
on 30 Jan, 2008 11:23
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Do you have any pictures?
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#9
by
jimfoo
on 30 Jan, 2008 11:57
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While it isn't too bad, I don't think it is nice enough for pictures as the flash seems to magnify any little imperfection, making it look far worse than it is.
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#10
by
burn_your_money
on 30 Jan, 2008 12:07
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it can't be any worse then if I did it, which I'll probably end up doing one of these fine days