Lockedstripped crank threads

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INTOODEEP
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2011/01/30 22:10:25 (permalink)

stripped crank threads

as the title says. i was installing my primary gr and i stripped out the threads on the crank. i hand started it then put the torque wrench to it. didnt even bottom the nut out and it stripped. ****. any ideas how to fix this short of buying a new crank that cost just shy of $500?

13 renegade
14 mav XXC
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    BridelessRacing
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    Re:stripped crank threads 2011/01/30 22:14:50 (permalink)
    weld the nut on


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    BridelessRacing
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    Re:stripped crank threads 2011/01/30 22:16:13 (permalink)
    i have done this several times you have nothing to loose at this point


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    INTOODEEP
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    Re:stripped crank threads 2011/01/30 22:19:53 (permalink)
    that crossed my mind. also i could just run it all the way up with an impact. i found some 20mm tap and die sets but i dont know if that would work.

    13 renegade
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    wes ranch 4x4
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    Re:stripped crank threads 2011/01/30 22:30:40 (permalink)
    id tap it and see if it will tighten up good and put loc tite on it. if that fails weld it on.

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    INTOODEEP
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    Re:stripped crank threads 2011/01/30 22:36:33 (permalink)
    well i only have one good hand so i would have to take it to someone for rethreading

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    wes ranch 4x4
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    Re:stripped crank threads 2011/01/30 22:43:03 (permalink)
    well id take it to some one get it rethreaded and buy a new nut too. and use loctite!!

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    gotmuddy
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    Re:stripped crank threads 2011/01/30 23:25:05 (permalink)
    No loctite is needed.  Go to the next size down and rethread the crank.

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    JTugwell
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    Re:stripped crank threads 2011/01/31 09:02:40 (permalink)
    ^^yep.  id run the engine over to a machine shop, and let them do it.

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    Eganx
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    Re:stripped crank threads 2011/01/31 10:33:35 (permalink)
    ya....I'd rethread the crank....but heres the deal....cutting strait threads with a die nut is near imposable with no way to support the die nut. But a machine shop with a metric die nut should be able to tighten the die nut and cut threads that are slightly smaller in diameter. The thought being that your current threads are not totally stripped and the tightened die nut would be guided by the remnants of the old threads. So the threads being cut would be strait and in line with the snout of the crank.
     
    Then a machine shop could measure the major and minor pitch diameter of your new threads and make you a new nut for the tighter threads.
     
    Here is the type of adjustable die nut  http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300505402072
     
    post edited by Eganx - 2011/01/31 13:47:35
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    texashorn21
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    Re:stripped crank threads 2011/01/31 13:21:58 (permalink)
    what you got planned to fix this? im thinkin either weldin the nut on or eganx is best route? idk good luck to you though
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    jeffh4x4
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    Re:stripped crank threads 2011/01/31 14:45:54 (permalink)
    Are you sure it's the threads on ur crank not ur nut? I had this happen to me but it was just the threads from the nut had come off on the crank I cleaned up the threads and got a new nut

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    Jake450s
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    Re:stripped crank threads 2011/01/31 18:00:22 (permalink)
    INTOODEEP

    as the title says. i was installing my primary gr and i stripped out the threads on the crank. i hand started it then put the torque wrench to it. didnt even bottom the nut out and it stripped. ****. any ideas how to fix this short of buying a new crank that cost just shy of $500?

     
    Wait a second...  What exactly is the damage?  If the nut's not down, the threads at the end, the ones that count, they may have a fighting chance.  Have you removed the nut to verify which threads are damaged?  Are they stripped, as in removed from what they used to be attached to or are they damaged from cross threading, previous impact gun servicing, or otherwise that has the tip of the thread "rolled over", but the metal (or at least most of it) is still there?
    Honestly, the prognosis is probably not that good at this point, but without very, very clear information, or EXCELLENT pictures, it's hard to offer sound advice towards getting the best solution the first time around.
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    SPORTSMAN08
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    Re:stripped crank threads 2011/02/02 12:16:21 (permalink)
    GETHERDONE

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    INTOODEEP
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    Re:stripped crank threads 2011/02/05 03:05:48 (permalink)
    Its the nut and crank. They arent stripped completely just rounded over. Im pullin the motor out today and removing the crank. A machine shop is goin to fix the threads. I dont use impacts to tighten clutch parts, only to remove them.

    13 renegade
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    INTOODEEP
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    Re:stripped crank threads 2011/02/05 11:09:24 (permalink)
    How does an adjustable die work?

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    Grizzly Man
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    Re:stripped crank threads 2011/02/05 11:20:48 (permalink)
    all right i did this on a 250 recon. the only thing i found that works is a thread file. go to a tool store and buy you a thread file. snap on, cornwell and im sure mac and matco sell em to. once you get the file. find out what size threads you have. the thread file had 8 different sizes of threads.
     
    after that start filing away. once you make threads all the way around it and you can start the nut. then and run it up all the way to tightin it. get some valve grinding compound. put it on the threads and install and remove the nut several times in order to clean up the threads.
     
    after the threads on the crank are clean and on the nut are clean. spray them both down with brake parts cleaner to get all the valve grinding compound off. then install the nut with some red lock tight and tighten it like you normally would and then everything is fixed.
    its aggrivating work. but thats the only way that i have found to fix that. i have fixed about 15 things with a dreaded thread file. and man i hate when someone says the words thread file. but it works when you have to use it. just takes a good amount of time

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    INTOODEEP
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    Re:stripped crank threads 2011/02/05 11:50:17 (permalink)
    Not sure what a thread file is, enlighten me. Its 20mmx1.00 pitch

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    tumbleweed89
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    Re:stripped crank threads 2011/02/05 12:01:05 (permalink)
    see the long things in the back that's the files u find the side that matches your thread size and pitch and you go with the threads and you just file them .

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    Eganx
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    Re:stripped crank threads 2011/02/05 20:56:34 (permalink)
    an adjustable die nut works like so.......look at the link I have in py previous post...see the slot in the die nut? there is a bolt that will expand or contract that slot....effectivly changing the diameter of the cutting teeth of the die nut....so you might could cut some tighter threads and have a machine shop measure the diameter of your new thread and make you a nut.
     
    Or.....what might be even better is see if you can find a 19mm x 1.00 die nut and cut the new threads and have a new nut made. I'm pretty sure and extra .020" a side wouldn't hurt. since it would be the same thread pitch the die nut would thread right on and cut some tighter threads....I think thats the route I'd go
     
    Here is a 19mm 1.00 pitch die nut
    http://cgi.ebay.com/M19-x-1-00-X-1-1-2-HSS-ROUND-ADJUSTABLE-DIE-/300505042315?pt=BI_Tool_Work_Holding&hash=item45f77f0d8b
     
    ****...... if your not in a hurry I'll make you a 19mm nut and send it to you
    post edited by Eganx - 2011/02/05 21:01:24
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    Jake450s
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    Re:stripped crank threads 2011/02/06 08:48:07 (permalink)
    There's a keyway in these threads.  That's gonna wreak havoc with an adjustable thread chaser. 
    running a 19mm die down 20mm threads is probably not going to happen either.  Even without the keyway, that's a LOT of metal for the first thread to try to take out in one pass.  It won't line up and "follow" the original threads.
     
    INTOODEEP
    Its the nut and crank. They arent stripped completely just rounded over. Im pullin the motor out today and removing the crank. A machine shop is goin to fix the threads. I dont use impacts to tighten clutch parts, only to remove them.

     
    Sounds like a lot of work, but probably the best option at this point.  The rounded over threads, without seeing them personally, would lead me to believe that the non-reuseable nut had been reused too many times (you CAN use them a few times, but not forever), or else it was overtorqued at some point in it's live.  I say "overtorqued" because the ones I've seen that were "impacted" until they "just stripped but it wasn't my fault...) usually were more jagged, torn looking.  Rounded over sounds more like a hand wrench, even a torque wrench if the nut was worn out from too many uses.  Odd for one so (relatively) new machine.
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    INTOODEEP
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    Re:stripped crank threads 2011/02/06 10:16:10 (permalink)
    This is the first time the nut has been removed. My laptop has a virus so i cant upload a pic. If someones gives me there # or email i can send the pic and they can post it

    13 renegade
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    INTOODEEP
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    Re:stripped crank threads 2011/02/06 12:44:42 (permalink)
    Well the lapping compound has givin me an idea. Ive covered the threads with it and im using my hand to run the nut back and forth. After an hour or so i am making progress. My hand is cramping so im taking a break. Its a pita and taking forever but looks like it is working

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    INTOODEEP
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    Re:stripped crank threads 2011/02/06 14:22:43 (permalink)
    Well the threads are fixed. Im still pullin the motor cause i dont think the threads are strong enough to press the clutch on. I can press it on then torque the nut and lock it down.

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    white09rancher
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    Re:stripped crank threads 2011/02/06 15:22:40 (permalink)
    ^^good deal man..ive been ridin mine around a lot today

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    INTOODEEP
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    Re:stripped crank threads 2011/02/06 20:38:05 (permalink)
    Well i pulled the motor, pressed the centrifugal clutch on. Nut torqued to 87 lbs. Put case cover back on. Slid motor back in the frame. Bolted it down. Hooked all wires back up. Im tired now. Will try and crank it tom

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    wes ranch 4x4
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    Re:stripped crank threads 2011/02/06 20:41:48 (permalink)
    awesomeness lol

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    Re:stripped crank threads 2011/02/06 22:28:32 (permalink)
    Well couldnt wait. I hooked everything back up and it cranked. On jacks stands it went through all the gears fine. So i guess its fixed

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    lil420camo
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    Re:stripped crank threads 2011/02/06 22:48:09 (permalink)
    i love the sig man.
     
    good to hear about the threads.

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    texashorn21
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    Re:stripped crank threads 2011/02/06 22:56:30 (permalink)
    lol do you feel the weight lifted off your shoulders now?
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