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NCT axle alignment

  • 01-12-2016 2:27pm
    #1
    cruhoortwunk
    Registered Users, Registered Users 2 Posts: 2,355 ✭✭✭


    My car failed NCT on rear axle alignment with -22m/km. Pass threshold is between 18m/km and -18m/km.
    Brought it to get fixed, and it retested at -14m/km.
    So I passed, but should it not be closer to 0 when the garage realigns it?


Comments

  • #2
    mgbgt1978
    Registered Users, Registered Users 2 Posts: 4,261 ✭✭✭mgbgt1978


    Depends on the Model.
    Often it's worn bushings which cause the sideslip. The Garage can't adjust those if they are the causing the issue.


  • #3
    cruhoortwunk
    Registered Users, Registered Users 2 Posts: 2,355 ✭✭✭cruhoortwunk


    mgbgt1978 wrote: »
    Depends on the Model.
    Often it's worn bushings which cause the sideslip. The Garage can't adjust those if they are the causing the issue.
    NCT was the day after the realignment though, would it not start around 0 and drift away from it as time goes on?


  • #4
    4odh4n
    Registered Users, Registered Users 2 Posts: 117 ✭✭4odh4n


    worn bushings = free play/movement, even if the garage reset the alignment to 0, as soon as the car would move and put pressure on the worn bushings the readings would change


  • #5
    mgbgt1978
    Registered Users, Registered Users 2 Posts: 4,261 ✭✭✭mgbgt1978


    If the NCT passed it you should be fine. They would probably have given more attention to the rear suspension during the retest (including checking for any visible 'play' in the bushings).
    If you hear any unusual clunks or rattles from the rear then it's time to get it checked.


  • #6
    JC01
    Registered Users, Registered Users 2 Posts: 592 ✭✭✭JC01


    mgbgt1978 wrote: »
    If the NCT passed it you should be fine. They would probably have given more attention to the rear suspension during the retest (including checking for any visible 'play' in the bushings).
    If you hear any unusual clunks or rattles from the rear then it's time to get it checked.

    Not true at all!!!

    Either you've fairly badly worn bushings or the garage made a woeful attempt at tracking the car, does It pull consistently too one side when driving?

    There's also a very very outside chance it's a badly damaged tyre/rim


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  • #7
    mgbgt1978
    Registered Users, Registered Users 2 Posts: 4,261 ✭✭✭mgbgt1978


    Calm down.
    It's within the NCT limits.
    They obviously didn't find any "badly worn bushings" or they would have failed it on the retest.
    As it's on the rear the car wouldn't necessarily pull to one side, it would be more likely to 'crab' if there was a large enough inconsistency in the rear tracking.


  • #8
    cruhoortwunk
    Registered Users, Registered Users 2 Posts: 2,355 ✭✭✭cruhoortwunk


    Bit of history on it:

    I had been noticing a bit of drift a while back when going over a certain speed, which started around the same time as when I hit a rock and got a flat tyre.
    http://www.boards.ie/vbulletin/showthread.php?t=2057394749
    NCT was a few months later and didn't find any issue, but when I look back on the NCT report form, the alignment result of 17m/km, was only barely under limit of 18m/km.
    I never got to the bottom of it that time, but I think we now have the cause. I only drive it about once every 3 weeks, so wasn't noticing it as much over the last 18 months or so.


  • #9
    JC01
    Registered Users, Registered Users 2 Posts: 592 ✭✭✭JC01


    mgbgt1978 wrote: »
    Calm down.
    It's within the NCT limits.
    They obviously didn't find any "badly worn bushings" or they would have failed it on the retest.
    As it's on the rear the car wouldn't necessarily pull to one side, it would be more likely to 'crab' if there was a large enough inconsistency in the rear tracking.

    You put a lot of faith in Nct testers. You would not beleive the stuff Iv seen pass tests on cars, I'm sure any mechanic would tell you the same.

    OP if go back to the garage that tracked the car and get them to give you a proper explanation as to why the tracking was still so far out, yes it was within limits but it's still far from what it's meant to be.


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