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View Poll Results: Do you use new bolts whenever it says you should?

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  • Yes

    5 35.71%
  • No

    9 64.29%
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Thread: New bolts, yes or no?

  1. #1
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    Default New bolts, yes or no?

    This may have been asked before but searched and couldn't find anything like it.
    So here goes...

    Having done a fair bit of work on the Signum recently, and still more to do, I've come across the old problem of, the Haynes manual says you need to use new bolts but you go along to the dealers and they tell you they have none in stock and it'll be next week before they can get them in. What do they do when they get a car in for, say, a routine suspension job? Just use the old ones? And it's not just Vauxhall, my local VW main dealer used to be the same.

    Interested to know what people do in general.

  2. #2
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

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    Engine : 2.0 cdti/1.6 Turbo

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    Default

    I've voted no however if the bolt is even slightly damaged or has been abused to get it out then I will replace it.

    Normally the bolts that NEED replaced are kept in stock at my dealer.

    I replace all of the nyloc/crimp nuts when required though and always torque things back to factory torque

  3. #3
    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

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    Depends on where bolts are.

    Something like head bolts then yes.

    Other wise then no. Still use correct torque settings and thread lock

  4. #4
    VIP-Member puppet's Avatar
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    Vehicle : Insignia 1.8 SRi

    Trim : VX Line Red

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    Year : 2011

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    Bit of common sense required I think. As long as the bolt isn't something "mission critical", or obviously damaged, then no, I wouldn't replace it just because a manual told me so. Do you honestly think the dealers replace every bolt every time..........

  5. #5
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    If the Haynes tightening sequence is in phasess something like tighten to 30Nm then turn throught 90 deg followed by another turn through 45 deg it will be a stretch bolt! this means that it has gone past its initial yield point and has deformed, re-use is therefore a gamble as the bolt is more likely to relax (having already gone well past its elastic section)

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    Quote Originally Posted by puppet View Post
    Bit of common sense required I think. As long as the bolt isn't something "mission critical", or obviously damaged, then no, I wouldn't replace it just because a manual told me so. Do you honestly think the dealers replace every bolt every time..........
    I would like to think the stealers always change bolts if the GM manual says so!

  7. #7
    VIP-Member puppet's Avatar
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    Vehicle : Insignia 1.8 SRi

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    Quote Originally Posted by paul667 View Post
    I would like to think the stealers always change bolts if the GM manual says so!
    Can't deny I would like to think it, but I'm not convinced they will!

  8. #8
    Regular Member MattVecVXR's Avatar
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    Default

    Personally I think if the bolt or nut has a good thread and head on it it's fine, with the exception of head bolts, nylocs etc. The quality of the internal threads aren't great on Vauxhalls anyway and they tend to strip out before bolts become threaded.
    If it came out with loctite on it, it should go back in with loctite on it, after a clean up.

    Quote Originally Posted by paul667 View Post
    If the Haynes tightening sequence is in phasess something like tighten to 30Nm then turn throught 90 deg followed by another turn through 45 deg it will be a stretch bolt! this means that it has gone past its initial yield point and has deformed, re-use is therefore a gamble as the bolt is more likely to relax (having already gone well past its elastic section)
    This is partially true. A tightening sequence doesn't mean that it's going to stretch and deform the fastenings, it's to ensure that the objects mating faces are aligned.
    For example, the tightening sequence on a cylinder head or even diametrically tightening up your wheel bolts. However certain bolts that remain under considerable stress for a prolonged time should be checked and replaced, as they are most likely to have been near the shear modulus for that given material.

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