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Thread: Timing belt tensioned stud failure and engine damage.

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  1. Re: Timing belt tensioned stud failure and engine damage. 
    #11
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    The M8XM10X73 stud, N 905 055 02, is not actually supplied for the job and the normal M8x73 is still listed, 03G 109 459, for a 2009 BKP as an example, it is just that a dealers parts department will now that the stud used in the 8v engine (eg BKE) can be used with the hole tapped out to M10x1.5. We only do this if the thread will not take a new 03G stud and note on the invoice that this is a non standard repair BUT it has never yet failed us. You could also put a TimeSert into the hole for the M8 or even a TimeSert for the M10. New VAG heads still come with the M8 stud, it is ironic that the lower power 1.9 has the sturdier (cheaper) part... One word of caution though, I have seen a VAG notice pointing out that this repair can fail if you do not ensure the radius of the step up in diameter is not set blow the level of the hole as the tensioner can touch the radius and cause the stud to fail.
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  2. Re: Timing belt tensioned stud failure and engine damage. 
    #12
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    For clarification, can you confirm that the part number for the new stud is actually N 909 055 02?
     
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  3. Re: Timing belt tensioned stud failure and engine damage. 
    #13
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    It depends on the application and previous repair history.
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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  4. Re: Timing belt tensioned stud failure and engine damage. 
    #14
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    Sorry, I must not have been clear. I believe the part number for the M10xM8 stud is not N 905 055 02 but is in fact N 909 055 02. Was just wanting to clarify in case anyone else (like me) was using this forum to guide them in their own repair.
     
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  5. Re: Timing belt tensioned stud failure and engine damage. 
    #15
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    Yes it is N 909 055 02 thank you for pointing it out.
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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  6. Re: Timing belt tensioned stud failure and engine damage. 
    #16
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    This happened to me, mechanic never offered any monetary compensation and said it was a known fault - his get out of jail card. Yet the advice is to buy an M10 stud - as the mechanic knew of this known fault I feel that he is negligent in not informing me so that I could make an informed decision to get the tensioner fitted with the new M10 stud. I assume that if I’d taken this into a VW garage for a timing belt change this is what they would have done. I drove my car for 360 miles before it cut out on me.
     
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  7. Re: Timing belt tensioned stud failure and engine damage. 
    #17
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    A VW dealer will not change to the dual diameter M8/M10 stud as it is not an official modification, they will only fit a new M8 stud. The dual diameter stud is also prone to snapping if it is not installed absolutely correctly and in your case that would mean drilling and tapping the head in situ which is awkward to get exactly square which is vital. We always fit new studs even when the kit does not have one and we have never had one fail that we have done.
    A petition has been started to allow the use of synthetic fuels when they become available, this may allow the continued sale of ICE vehicles post 2030 and the use of classic vehicles well into the future… Their use may even be able to rival electric vehicles given the chance. Please sign this petition IF you feel the infernal combustion has a future if sustainable fuels are made available


    https://petition.parliament.uk/petitions/588774
     
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  8. Re: Timing belt tensioned stud failure and engine damage. 
    #18
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    Was there any engine damage in your case or just a case of resetting the timing after replacing the stud?
     
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  9. Re: Timing belt tensioned stud failure and engine damage. 
    #19
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    Quote Originally Posted by StreetFitter View Post
    Was there any engine damage in your case or just a case of resetting the timing after replacing the stud?
    Question to...??

    I have not seen a stud failure that has not caused at least some damage whether it be a bent valve or damaged piston. Any sort of speed and it is usually carnage.
     
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  10. Re: Timing belt tensioned stud failure and engine damage. 
    #20
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    Quote Originally Posted by DMitch16 View Post
    Question to...??

    I have not seen a stud failure that has not caused at least some damage whether it be a bent valve or damaged piston. Any sort of speed and it is usually carnage.
    Mine went at 60/70 and I just set the engine to TDC. Re-tapped and fitted a helicoil and away it went!
    VW BKD Fail! Touran 2.0 TDI tensioner stud came loose at 60mph so reset the timing and it ran!! - YouTube
     
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