749 Swing-arm Problem

Discussion in '749 / 999' started by ceetaji, Jun 16, 2016.

  1. Hi all,

    I'm in a bit of a pickle and I'm hoping someone can help?

    I was replacing the heavily corroded bolts on the swing-arm at the weekend when one wouldn't come out. I made the decision to cut off the chain slider to figure out why and found this Dropbox - IMG_2673.MOV

    In short the bolt is corroded to the collar that sits in the swing-arm and the collar has snapped and now rotates freely but cannot be removed. I've tried a number of ways, all unsuccessfully. This is how it should work Dropbox - IMG_2674.MOV

    Has anyone experienced this before? And if so, how did you resolve it without damaging the swing-arm? Hopefully its not a case of having to buy a new swing-arm over a bolt?!

    I planned for the swing-arm to be repainted this winter so it has to come out one way or another.

    Any light people can shed on the subject would be really appreciated. Thanks in advance.

    C
     
    #1 ceetaji, Jun 16, 2016
  2. #2 Cream_Revenge, Jun 16, 2016
  3. Ah the good old rivnut syndrome
    The threaded component which is spinning in the swing arm is a rivnut.
    http://www.practicalmachinist.com/v...51962653-rivnuts-sale-lots-rivnuts-n6t8v6.jpg

    I you can't get the bolt free and removed from the rivnut. Best bet is to drill the flange off it and then go fishing with a magnet to recover the remains. (It can be done) buy a new rivnut and re set it. I normally set mine with a long bolt a few washers and a plain nut rather than buying the pliers.
     
    #3 Northan Monkey, Jun 16, 2016
    • Agree Agree x 1
    • Useful Useful x 1
  4. I've tried the wedging affect but I've not tried it with the spray suggested or Q-bond. Only WD-40. I was cautious of using glue as knowing my luck it would find its way to the thread and hold it even more! :tearsofjoy: I'll give both a go before more drastic measures are taken, thanks!

    Odd how they used this method to fix 3 bolts on the swing-arm, yet the others are not the same. Thanks for the explanation of whats gone wrong though. I assume you can buy the replacement item from Ducati or a reputable alternative source? Is the rivnut in anyway welded to the sub frame so I know how to prevent boding it should I go down this route?

    I'm not keen on drilling it out because if its not a small enough piece to fish out, it'll forever rattle around. Grrr, what a poor design oversight.

    Thanks again to you both for the quick responses! :grinning:
     
    #4 ceetaji, Jun 16, 2016
  5. if you are going to paint it anyway then perhaps a spot weld on the washer to hold it whist you screw the bolt out then grind flush
     
    #5 6GR, Jun 16, 2016
  6. I'm pretty sure there's a couple of places where you can get in there with a magnet and give it a shake.
    I'm pretty sure you can't weld ally to steel so leave the welder out of it. ;)
     
    #6 Northan Monkey, Jun 16, 2016
  7. if it is ally then you are right :flushed:
     
    #7 6GR, Jun 16, 2016
  8. I was thinking the same until I remembered it was made from Aluminium :disrelieved:

    That's really kind of you, thank you! How much would they cost inc P&P? Happy to go fishing if need be, ideally I wouldn't have to load up on Araldite :smile: I'm in Nailsea (Bristol).

    Out of curiosity has anyone had this problem on their 749/999 black swing-arms?

    I'm picking up my replacement chain slider at the weekend, I'll ask if
    Ducati can shed some light on whether or not there are any locations to gain access. I would have thought there weren't any, but I'm happy to be proved wrong! :grinning:

    Doh! :)

    Thanks again to you all, finger's crossed one of the many solutions works :upyeah:
     
    #8 ceetaji, Jun 17, 2016
  9. you may still be able to grind it down and hook the last lill bitty out
     
    #9 6GR, Jun 17, 2016
  10. Apologies for the delay - I was in hospital. Fun times :grimacing:

    The ones in question are M6. Ducati don't sell them individually unfortunately. I'm currently waiting on the bits to try and dissolve the rust, so I'll keep you posted if that's ok? I'm hoping its only a case of removing the bolt once the rust has been dislodged and re tightening the rivnut with a new bolt?! Wishful thinking perhaps and my gut instinct is I will need to drill out the old rivnut and replace it. Baby steps though :grinning:

    Thanks again for the really kind offer, haha, yeah, just a little far to come, but its nice to know this forum is filled with decent people willing to help! :smiley:
     
    #10 ceetaji, Jun 19, 2016
    • Like Like x 1
  11. To fit a M6 rivnut, you usually need to drill a hole of around 10mm.
     
    #11 ducati dad, Jun 19, 2016
  12. Awesome, thanks a bundle! I'll keep you posted on my progress :smiley:

    Thanks guys. I'll start small and hope for the best :upyeah: Fingers crossed no drilling is required :)
     
    #12 ceetaji, Jun 21, 2016
(You must log in or sign up to post here.)
Do Not Sell My Personal Information