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  • Anonymous
    Inactive
    08/05/2007 at 7:49 am
    Post count: 5
    #2040

    Hi,Ok, here's an engineering challenge for you! While I was tightning up my right hand rocker cover, the rear top bolt just kept turning and not tightning. I took the cover back off and a lump of the casting that has the thread in fell into my hand. The bit that is fell out is 50% of the available thread and I'm at a loss as to how to repair it. People have suggested helicoil, but I'm not sure there is enough existing thread to hold it. Someone has suggested cutting a 6mm thread inside a larger bolt and screwing the larger bolt into the remaining metal.Has anyone had this type of thing happen to them? Does anyone know who would be able to fabricate such a bolt?Any suggestions gratefully accepted!DA

    Jim Young
    Participant
    08/05/2007 at 11:28 am
    Post count: 581
    #7670

    Doesn't fitting a helicoil involve drilling and tapping a larger hole for the helicoil to screw into ?Of course this would only be possible if you have enough metal on the casting to do it.Best of luck fixing it, I know how you must feel when things like that happen, that sick feeling in the pit of the stomach, usually accompanied by some choice words.  😮

    Dave Ross
    Moderator
    08/05/2007 at 7:08 pm
    Post count: 2310
    #7671

    You should be able to have it welded and re-tapped. They are little more than hand tight. I use the torque wrench or stop when the rubber seal shows signs of compression. Of course, the crack could have been the delayed result of a tip-over. Check out the ads in the back of Kiwi Rider magazine for place to go for welding.

    Anonymous
    Inactive
    08/05/2007 at 9:30 pm
    Post count: 17
    #7672

    Just helicoil it. Much easier, and a permanent solution. Used to do it alot on Magnesium aircraft gearbox casings. Simple, quick, strong. Select the correct helicoil kit, and all the tooling needed should be in it.

    Anonymous
    Inactive
    20/05/2007 at 5:14 am
    Post count: 4
    #7673

    Loctite sell a “Form -a-Thread” repair kit or Delo sell an alloy repair kit that can be drilled, tapped after 90 mins if you decide not to helicoil. Good luck.

    Dave Ross
    Moderator
    06/06/2007 at 8:24 am
    Post count: 2310
    #7674

    What's the latest on the rocker cover saga? Did you get it repaired alright?Cheers,Alex

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