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R230 ABC oil leak under front left (NS on RHD)

Discussion in 'Suspension, Steering & Brakes' started by Marcus88, May 23, 2020.

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  1. Marcus88

    Marcus88 New Member

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    2005 R230 SL500 / 1996 R129 SL280 / 1976 R107 350SL / 1988 R107 560SL
    Hello, I have a 2005 R230 SL500. There is a pool of ABC fluid under the front left behind the wheel arch / sill area. From what I have researched, the Pulsation dampener, Pressure Supply Valve Unit and ABC pressure sensor are in that area. I have no warnings on the dash.

    I have peered underneath and the fluid seems to be running down from the undercover.

    Any advice on how to remove the cover and where to start looking would be greatly appreciated.
     
  2. ajlsl600

    ajlsl600 Senior Member

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    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    Front left ie p/s. Just behind wheel? There's a few pipe connections in there I had a weeping pipe. £100 fix. Wheel off liner out. Less than hr No big issue. Also in there horn/alarm that beeps when you lock car.
     
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  3. John Laidlaw

    John Laidlaw Senior Member

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    r230 abc schematic.png Welcome Marcus
    This will help locate the various components
    However I would say dropped fluid is never a good thing, warnings might not be there yet, but lack of fluid in the ABC can escalate failure of the pump especially very quickly, something you don’t want!
    Most of these parts are not easily accessible (radiator out to access the pump for instance).I think what you’re looking for might require removal of the NS front wheel liner from memory? I would suggest not running the car until you can get it looked at by someone who knows ABC well. Where are you located ?
     
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  4. OP
    Marcus88

    Marcus88 New Member

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    Hi, thanks. Yes, I will not run the car until its fixed. I have take the front wheel off and the liner, here are some pictures of the area. Located Worcester, UK.
     

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  5. LostKiwi

    LostKiwi Senior Member

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    I'm not seeing any fluid leak there?
     
  6. OP
    Marcus88

    Marcus88 New Member

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    Right, maybe is leaking from the back where the Pulsation Dampener fits, it leaking and running along the cover ...see pciture attached
     

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  7. ajlsl600

    ajlsl600 Senior Member

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    Is switch leaking, or above, behind? Clean area well. Have someone opp the ride height switch in car. Should see something..
     
  8. ajlsl600

    ajlsl600 Senior Member

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    Pic 3 of 7 on mine leaking from swaged joint on pipe in lower left of picture.
     
  9. OP
    Marcus88

    Marcus88 New Member

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    Sorry which switch ? I will go and clean the area, thanks for your help
     
  10. ajlsl600

    ajlsl600 Senior Member

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    In Pic 1 there is a switch./sensor, Of some kind, pressure?
    Sometimes these leak between casing and plastic. If so only long term solution, replace. Clean whole area run, observe given system pressures you should see something, try a clean white cloth or paper under that area to pin point. But do cycle the height switch in car
     
  11. OP
    Marcus88

    Marcus88 New Member

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    I have found the leak. See picture. The bolt on the banjo fitting was quite loose, I tightened it up but it still leaks. So hopefully, I just need a new O-rings /washers.

    Does anyone know what size O-ring / washer? 2pcs right?

    Many thanks for all the help.
     

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    Last edited: May 23, 2020
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  12. LostKiwi

    LostKiwi Senior Member

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    What's the green stuff squeezing out from under the sealing washer?
     
  13. OP
    Marcus88

    Marcus88 New Member

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    I noticed that too, looks like a previous bodge job. If I undo and remove the banjo bolt, likely a lot of fluid will come out right, although if its been leaking the pressure shouldn;t be bad. do I have to some how bleed it once I put the new O rings in? Thanks
     
  14. LostKiwi

    LostKiwi Senior Member

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    System should self bleed. Ideally you'd use Star to run a rodeo test to force the air out but cycling through the heights several times should suffice.
    Be careful undoing the banjo - there may be a lot of hydraulic pressure present.
     
  15. OP
    Marcus88

    Marcus88 New Member

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    Ok thanks for your advice, I will leave it overnight which should reduce the pressure a bit due to the leak. Any idea what size O-rings they are? The Head of the banjo bolt is 19mm, so I guess M12 or M14. Cheers
     
  16. LostKiwi

    LostKiwi Senior Member

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    They should be copper washers not o rings. An o ring would be unlikely to stand the pressure (200 bar = 2950psi approximately).

    Sorry don't know the size.
     
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  17. John Laidlaw

    John Laidlaw Senior Member

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    Not sure what the washer size is but for the sake of a few quid it might be worth contacting MB Grangemouth 01324 686002 for the correct part ?
     
  18. John Laidlaw

    John Laidlaw Senior Member

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    I think they are dowty seals if I remember correctly
     
  19. OP
    Marcus88

    Marcus88 New Member

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    Many thanks for your help
     
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  20. ajlsl600

    ajlsl600 Senior Member

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    Maybe someone put copper washers and what we see in photo is corrosion of same?
    As long as Benz marketing can supply the correct parts/seal washers. Without having to buy valve Ias well?? I would go for that. High press and a pain if you have to do it again
     

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