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Any consequence to using a non stretch bolt for one of the dogbone bolts?

Bad Sir Culation Dec 29, 2013

  1. Bad Sir Culation

    Bad Sir Culation Member

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    I have already done this, but thought I'd check while I remember.

    I bought new bolts for when I replaced my dogbone bush with a red powerflex item. I tightened to the torque setting I found on one of the forums, 40nm (for the two different length bolts) and then a quarter turn. I didn't quite reach a quarter on one of them when I felt that horrible feeling of the bolt threading the hole and going loose again.

    When I removed it again, it brought some of the thread out with it. I did manage to find a slightly longer bolt which I have now replaced it with as it managed to find enough thread for me to torque it to 40nm.

    Should I just leave it now and forget about it, or should I expect issues?
     
  2. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User quattro Audi A4 Audi Avant Owner Group TDi

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    How long is a piece of string. I would give it a week or so and check it's still tight at 40Nm . If so you are probably good.

    Karl.
     
  3. badger5

    badger5 www.badger5.co.uk Site Sponsor

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    torque angle on old gear is flawed imho (unless head bolts) as the threads are so often corroded and the dogbone stuff corrodes like a mofo from galvanic corrosion... steel bolt, ally housing etc...

    "feel" overrides factory torque angle for me.

    Choose a 10:9 grade bolt but if the captice nut bits damaged you will struggle to get it tight :(
     
  4. Bad Sir Culation

    Bad Sir Culation Member

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    Checked this a week or two ago and it was OK. I am going to check again this weekend as it's now been about a month so if it's still tight I will stop worrying about it.

    Re: steel bolts/ally housing, had this on a set of Brembos once. The bolt welded to the caliper and the whole thing ended up having to be helicoiled!
     

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