Help, broken pivot bolt threaded side still in frame

Discussion in 'Shop Talk' started by MrGreedom, Apr 15, 2018.

  1. MrGreedom

    MrGreedom Well-Known Member

    Location:
    Los Angeles
    Name:
    Ryan
    Current Bike:
    BH Lynx6
    Was loading up to go for a ride and felt some play in my bikes rear end. I sourced the looseness to the floating pivot above the shock. At first it looked like I just lost the locking nut. But I pulled out the bolt to reveal an even worse scenario. The bolt snapped at the base of the threads. The threaded side is still in the pivot and holding the shock so I can't even swing it out. So how do I back out the broken threaded side piece of hardware?

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    bvader, Faust29, herzalot and 9 others like this.
  2. rossage

    rossage iMTB Addict

    Location:
    East Sacramento
    Name:
    Ross Lawson
    Current Bike:
    Highball
    Nasty! First thing that come to mind is drill, baby drill. Aim for that center punch mark..
    Then use an easy-out (shitty name it's rarely easy) to back that out.

    I hope someone has an easier way.
     
    Faust29, HBkites, Mikie and 6 others like this.
  3. Danmtchl

    Danmtchl Well-Known Member

    Location:
    Bakersfield
    Name:
    Dan
    Current Bike:
    2015 Devinci Troy Carbon 27.5
    Buy a new bike!! That seems to be the easiest way to fix it.
     
  4. Runs with Scissors

    Runs with Scissors iMTB Hooligan

    Location:
    West Anaheim
    Name:
    Mark Whitaker
    Current Bike:
    2015 Giant XTC Advanced 1 29er
    Yeah, that aint fun. I've drilled titanium bolts out of airplanes and this is what works:

    Get a drill bit rated for steel or titanium. What you use for wood or aluminum will dull out in 2 seconds.

    Center the bit and keep the rpms low to keep the heat down. Brace the frame and lean on the drill. Drill it all the way through if you can; that relieves some pressure on the bolt threads.

    Then, as @rossage says, use an easy out.

    Good luck!
     
    kioti, SnakeCharmer, Faust29 and 7 others like this.
  5. Voodoo Tom

    Voodoo Tom MTB Addict

    Location:
    Castaic
    Name:
    Tom Kokkinakis
    Current Bike:
    Mango one, blue one, black one
    First off @MrGreedom good job for recognizing something wasn't right and then taking the time to figure out the problem. Having managed machine shops pretty much my whole life I have run in to this more than a few(hundred) times. I have a technique that for me has been hugely successful. Nothing against using an EZout but my success rate with them is low. What I like to do is use a small center drill(#1) to slowly and carefully get a decent center hole started. Then follow that with a good drill(probably 1/8" in your case) that only needs to be drilled 1/8" deep or so. Then take a slightly larger torx bit(t20 or t25) and solidly tap the torx bit in to the hole you drilled. The star shape of the torx bit gets a good bite and creates it's own spline and can then be used to just thread the busted bolt out. Same basic idea as the ez-out but way higher success rate for me.
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  6. sir crashalot

    sir crashalot Well-Known Member

    Location:
    laguna beach
    Name:
    gary fishman
    Current Bike:
    2018 banshee rune
    +1 on the Torx bit, that’s what I do too
     
    kioti, Faust29, Mikie and 5 others like this.
  7. scottay

    scottay Well-Known Member

    Location:
    Gods Country
    Name:
    Scottay
    If you're lucky and the bolt isn't too tight ( soak it with penetrant) it will just wind itself out when you drill it. The drill will twist the same way as the threads and just push it thru.
    Probably not on the pilot hole, but maybe on the next step up.
     
    kioti, SnakeCharmer, Faust29 and 10 others like this.
  8. MrGreedom

    MrGreedom Well-Known Member

    Location:
    Los Angeles
    Name:
    Ryan
    Current Bike:
    BH Lynx6
    *Update*
    Fixed it! No drilling required. What I did: remove the right pivot where the broken thread was lodged. Once off, I could grip the bolt and easily unscrew the remaining part. Clean off built up dirt I can't usually get to, replace everything, and torque it back to spec. Luckily my good buddy George still has the demo BH we removed the bolt from it for my bike so I can be rolling asap. Replacement bolt for the demo is in the mail. Nice having a riding buddy that owns a LBS that trusts me to use a stand and tools.

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  9. LLPoolJ

    LLPoolJ iMTB Rockstah

    Location:
    Moreno Valley
    Name:
    James Johnson
    Current Bike:
    Specy Epic, Stumpu and Enduro
    Sweet glad it was easyish, I have the same buddy.
     
    MrGreedom, Danmtchl and Cyclotourist like this.
  10. dustyyoungblood

    dustyyoungblood Well-Known Member

    Location:
    Ladera Ranch
    Name:
    Dustan Baker
    Current Bike:
    Foes Mixer Trail
  11. scan

    scan Well-Known Member

    Name:
    fran allas
    Current Bike:
    Scott Spark
  12. Mikie

    Mikie Admin/iMTB Hooligan

    Location:
    Lebec, California
    Name:
    Mikie Watson
    Current Bike:
    Santa Cruz Hightower/Yeti 5C
    I want your toolset.


    Edit: Re read your success post...


    I want his toolset.
     
    Danmtchl, Faust29, UPSed and 2 others like this.
  13. Runs with Scissors

    Runs with Scissors iMTB Hooligan

    Location:
    West Anaheim
    Name:
    Mark Whitaker
    Current Bike:
    2015 Giant XTC Advanced 1 29er
    Thou shalt not covet another man's tool. :D
     
    Danmtchl, Faust29, kioti and 6 others like this.
  14. herzalot

    herzalot iMTB Hooligan

    Location:
    Laguna Beach
    Name:
    Chris
    Current Bike:
    '15 Intense Tracer 275c DVOish
    Awesome!

    So now back to the original question - why did your hardware fail on a brand new bike? Did you ask BH?
     
    MrGreedom, Mikie, Danmtchl and 2 others like this.
  15. Faust29

    Faust29 iMTB Hooligan

    Location:
    Rancho Santa Margarita
    Name:
    Steve Macko
    Current Bike:
    3 Times SC, Oh My.
    I was wondering the same thing. Any chance it was weakened during the fender bender?
     
  16. mtnbikej

    mtnbikej J-Zilla

    Location:
    Orange
    Name:
    J M
    Current Bike:
    SC Chameleon SS, SC Hightower
    Simple answer...::he is an animal. :eek:
     
  17. MrGreedom

    MrGreedom Well-Known Member

    Location:
    Los Angeles
    Name:
    Ryan
    Current Bike:
    BH Lynx6
    I did send an email to the BH warranty/service dept. I told them I wanted the mechanical failure documented since I've only ridden a few hundred miles on this bike. They responded that they have gotten this problem before. I guess I'm in the same category as @mtnbikej stronger than steel.
     
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