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Changed drop links and stripped a thread!

Discussion in 'A3/S3 Forum (8L Chassis)' started by Vex182, Aug 2, 2013.

  1. Vex182
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    Vex182 Guess what I drive...

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    [Aug 2, 2013]
    Got round to changing my rear drop links today, did the near side and all was well, got the off side off ok but when doing the bottom bolt back on, it started to slip about 1/2 in, undid the bolt and out comes threads! It was gt-85'd before they were removed and copper greased when going back in. The bolt screws in straight enough without the shock so I know it was not cross threaded anyway. I guess my best bet is a new lower shock bolt and try and retap the thread? Really annoyed about this! :(
    #1
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  3. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Aug 2, 2013]
    Or do what I did and use a longer bolt and nut. Simples.
    #2
  4. Vex182
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    Vex182 Guess what I drive...

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    [Aug 2, 2013]
    ive just been thinking of this, everything all good? What length have you gone for approx? 22mm nut?
    #3
  5. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Aug 2, 2013]
    Christ mate aint got a clue, happened about 2 gears ago and its been apart loads and still perfect, used same size bolt just longer that I had.
    #4
  6. Vex182
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    Vex182 Guess what I drive...

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    [Aug 3, 2013]
    Thanks anyway, ill have a look in my lunch hour tomorrow and see what I can do.
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  7. JimS3
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    JimS3 Active Member

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    [Aug 3, 2013]
    The OEM bolts are high tensile, so try and find a longer high tensile bolt.

    Not going to end well if you hit a pot hole and it snaps!
    #6
  8. Vex182
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    Vex182 Guess what I drive...

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    [Aug 3, 2013]
    I've ordered some 120mm M14 bolts as the 100mm I got earlier was a bit short. Best I could get was 8.8s, should be beefy enough?
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  9. JimS3
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    JimS3 Active Member

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    [Aug 3, 2013]
    8.8 should be fine, doubt the OEM ones are any higher rated than that.
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  10. Vex182
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    Vex182 Guess what I drive...

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    [Aug 4, 2013]
    t

    Thats good then, it seems the maximum torque should be around 140nm and I need to do them to 125nm.
    #9
  11. Sam_
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    Sam_ Down under

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    [Aug 5, 2013]
    Those bottom shock mounts sit at such a weird angle it's hard getting them lined up 100%.

    I've noticed most suspension related bolts seem to be 10.9 or 12.9. Probably worth trying to get something a little beefier.
    #10
  12. JimS3
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    JimS3 Active Member

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    [Aug 5, 2013]
    Not aware any 12.9 bolts being used on VAG suspension, even the TDI head bolts with their high compression are only 10.9.

    Suppose using 10.9 would give peace of mind, but I can't see a bolt as big as M14 in 8.8 grade snapping with this application.
    #11
  13. Vex182
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    Vex182 Guess what I drive...

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    [Aug 5, 2013]
    Cheers, well the bolts should be here tomorrow so ill give them a go anyway, if not ill have to try and find something else.
    #12
  14. Tooks
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    Tooks Active Member

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    [Nov 3, 2013]
    Apologies for reviving an oldish thread, but this happened to my rear shock mount a couple of days ago too.

    I did a temporary fix with a mild steel M14 120mm nut and bolt I had in the garage, and then drove very steadily to the nearest engineering supplies place.

    The best bolt they had for the job was an M14 130mm 8.8 strength with matching high tensile nyloc nut, all for the princely sum of £1.75.

    I managed to clean up the head of the old bolt and could see it was 10.9 strength, and I mentioned this to the engineering place.

    Obviously, his official advice was to replace with the same strength bolt, but that a brand new 8.8 bolt was likely to be stronger than a 12 year old 10.9 bolt anyway.

    I got the one with a shoulder that the drop link and shock sit on, and I ground off about 10mm to make it a neater fit.

    I've since found a place online that does 10.9 nuts and bolts, so might get a couple as I suspect the other side might do the same one day.

    Interestingly, the mild steel bolt had not deformed at all, but clearly wouldn't have lasted long term, I did it only as a fix to get me mobile again to fetch the new bolts, and I don't recommend it!
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  15. Vex182
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    Vex182 Guess what I drive...

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    [Nov 3, 2013]
    I used a 8.8 in the end and all has been well since I fitted it with a locknut on the end.
    #14

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