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changing dogbone bush (major fail)

Discussion in 'A3/S3 Forum (8L Chassis)' started by s3 jack, May 13, 2012.

  1. s3 jack
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    s3 jack Member

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    [May 13, 2012]
    Ok so today i thought i would attack the dogbone bush which was on my long todo list and thought this would be an easy 20 miniut task. So i started undoing the 4 bolts, all fine untill i came to the last bolt the right hand one witch i think is bolted onto the subframe and the f**ker snaped :mad:, the head has come off this bolt leaving the threaded part in there.

    Any ideas on what i should do

    thanks jack
    #1
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  3. voorhees
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    voorhees Moderator Staff Member Moderator

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    [May 13, 2012]
    Put a smaller drill bit in and drill it out
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  4. s3 jack
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    s3 jack Member

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    [May 13, 2012]
    i dont think ill be able to get a drill in at the right angle with out damaging the threads
    #3
  5. moredoor
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    moredoor Member

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    [May 13, 2012]
    Remove the subframe(which isn't too bad a job) heat up the bolt with a gas blow torch from B&Q and then use mole grips to work it loose.
    #4
  6. voorhees
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    voorhees Moderator Staff Member Moderator

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    [May 13, 2012]
    Can you not park up on a high kerb or drive onto boards to make it higher,then try and centre punch the middle and use a small drill bit.not easy granted.
    #5
  7. s3 jack
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    s3 jack Member

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    [May 13, 2012]
    Voorhees i think i might have to try this, it is on axle stands at the min. What a major f**k up
    #6
  8. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [May 13, 2012]
    Head a few of these stories recently. Serious pita. I had a DP stud snap off a few months ago in the turbo and had to drill it out. Luckily there was just enough thread left to grip a new bolt.

    Good luck with getting this out mate.
    #7
  9. Eddie S3
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    Eddie S3 Member

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    [May 13, 2012]
    I had the exact same thing happen to me when i tried changing mine, Lots of heat and molegrips worked a treat
    #8
  10. Turbo unit
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    Turbo unit Member

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    [May 13, 2012]
    Always a good thing todo^^^^^.......Future ref penetratingfluid to hand and soak any bolts or nuts before attacking the job in hand(just a lil advice which ent no good till next time lol) good luck :icon_thumright:
    #9
  11. s3 jack
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    s3 jack Member

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    [May 13, 2012]
    I did use penatrating fluid before i started but wouldnt budge it. I managed to get the dog bone out with a bit of force as lukily that isnt threaded, unfortunatley the bolt has shered off flush with the subframe so i cant even get a pair of grips in it.
    Has anyone ever used screw extractors and now if there any good
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  12. Y83OLK
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    Y83OLK Hulk Smash!

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    [May 13, 2012]
    Be careful. If you snap an extractor off in the stud it will be even more difficult as you cannot drill them easily.
    #11
  13. s3 jack
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    s3 jack Member

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    [May 13, 2012]
    if its gana happen, its gana happen to me
    #12
  14. BENJAMIN
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    BENJAMIN Active Member

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    [May 13, 2012]
    This is really common on the dogbone mount! It's the bolt corroding to the alloy mount that makes the head snap off, heat the base of the mount up and drive a wedge between the subframe and base of the mount and lever it away. It will eventually slide off the snapped bolt. The snapped stud will simply unscrew by hand! I get this at least once a month on a3's and golfs. Steel bolt + alloy mount + 10 years of salt water, it's no surprise really! Lol
    #13

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