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Thread: Front left strut leaking, sometimes....

  1. #1
    Join Date
    Jun 2013
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    Front left strut leaking, sometimes....

    Hi all,
    We have an early sport that the front left strut leaks on,

    When I say leaks, we can hear a hiss at the top, but ONLY when it is letting the car down, it NEVER leaks down even if parked for a fortnight.
    I have never had one out, so a little confused as too how it could only leak when lowering, as it appears to only have one line in, is this correct?
    I'd it had two lines, one feed line and one dump line, this would explain it much better.

    Cheers
    James

  2. #2
    Join Date
    Jan 1970
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    St Helena,Melbourne
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    13,061
    Sounds like its exhausting the air out but i thought that was done at the valve block which on a D3 is on the RH side behind the bumper so not sure how it would leak out of the strut without affecting the raising as well.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  3. #3
    Join Date
    Nov 2014
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    Nirvana near Albany W.A.
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    when the bag rolls to the weak spot as it's lowering , air can escape through there , as the bag does a 180 degree on itself

  4. #4
    Join Date
    Apr 2008
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    If it doesn't go down when left for two weeks, you have nothing to worry about.
    paul

    D4 MY12 white,2.7(with a few more killer wasps) rear air,e diff,xenons,arb bar,7 seat ,18" bfg KO2

    2009 Defender 110 (son's)ARB
    bar,snorkle,rocksliders,rack,KM2's,BAS chip, always needs a wash

    '56 S1,been in the family since...'56

  5. #5
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    Jun 2007
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    Margaret River
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    Maybe its pushing out air trapped between the outside of the bag and the body of the strut, as you lower the suspension.
    This would explain the hiss, yet no loss of of suspension over time

  6. #6
    Join Date
    Jun 2013
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    Orroroo
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    420
    Thanks for the ideas guys...but just to repeat...

    It never hisses air out on the way up in any mode, only when you press the lower button, and it's right at the top of the left front strut....so that's when going from off-road height to normal, and from normal to access.

    It doesn't leak down at all when parked, the issue is that I *think* it's causing a fault in the suspension ecu, and I haven't had time to check it out further, but I believe it's because the exhausted air is not making it's way back through the system, does that sound right to anyone? Or have I got the wrong car in mind....I play with far too many different ones to remember what's what!

    Cheers
    James

  7. #7
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    13,061
    There is only one line which operates as in/out and the air exhausts via the compressor i believe so it doesn't make sense that it makes a noise without affecting both raising and lowering.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  8. #8
    Join Date
    Jun 2013
    Location
    Orroroo
    Posts
    420
    Quote Originally Posted by loanrangie View Post
    There is only one line which operates as in/out and the air exhausts via the compressor i believe so it doesn't make sense that it makes a noise without affecting both raising and lowering.
    Yep I agree, that's what's doing my head in!

  9. #9
    Join Date
    Mar 2008
    Location
    Bellarine Peninsula, Brackistan
    Posts
    2,640
    The aerodynamics inside the system are not the same for the air going one way, then the other.

    Just one tiny lip or similar inside a join could generate a noise with air going one way but not the other.

    Think of a real whistle (as an extreme example)............. blow air in the normal outlet and its silent, blow air in the normal inlet and it can hurt your ears.

    DL

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