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Oil ? Strange place

Discussion in 'General Mercedes-Benz Related Discussion' started by Flyinspanner, May 16, 2018.

  1. Flyinspanner

    Flyinspanner Senior Member

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    Hi,

    Just been under the CL as I was going to change diff oil. (Aborted as I don’t have correct key...mine all too small) and I noticed this moist oily patch on the plastic undertray, appears to be clear fluid. -under n/s rear seat area. All pipes in out of area dry, not thrown from rear drive/axle as intervening area dry, what do you think? Where should I check?

    Thanks in advance for your inputs. :)
     

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  2. Naraic

    Naraic Moderator

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    Isn't there a sphere in the area?
     
  3. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Saw a sphere behind the axle, drivers side all dry, and ABC fluid level looks ok. No malfunctions.
     
  4. Naraic

    Naraic Moderator

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    The sphere on the nearside is take out spikes...it is there though. Remove the tray?
     
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  5. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Will get it up in the air again ....tomorrow :)
     
  6. alexanderfoti

    alexanderfoti Moderator

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    Fuel filter and fuel pump
    Rear ABC valve block.
    Return damper.

    All under that cover.

    Hope its the former and not the latter
     
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  7. LostKiwi

    LostKiwi Senior Member

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    Get s piece of white kitchen towel and allow the liquid to soak onto it.
    If the stain on the paper is green it's ABC, yellow is engine oil, brake fluid or fuel, red is ATF.
     
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  8. OP
    Flyinspanner

    Flyinspanner Senior Member

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    2AE9E854-D55E-4A46-AA52-6822459F0D1C.jpeg 25F025F1-1577-4E35-BFCB-3D602CF42F36.jpeg Ok....

    It looks like weeping at the valve block. :(
    But really cannot work out if it is the union or a pipework problem.
    The lower solenoids were misted, as is the wiring. Cleaned it off wiping with kitchen paper.

    Have a look at photos and tell me what you think.
     

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  9. OP
    Flyinspanner

    Flyinspanner Senior Member

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  10. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Slight annoyance as one of the little mounting studs for the plastic cover sheared off :( - the one just fed of the wheel , so probably gets lots of spray/mic - the other 3 all fine and now copperslipped.
     
  11. alexanderfoti

    alexanderfoti Moderator

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    Same issue with mine.

    Looks like its leaking from the solenoid O rings and then being pushed back via air/wind etc.

    The pipe connections are just flared metal with no O-rings to leak so less likely imo
     
  12. OP
    Flyinspanner

    Flyinspanner Senior Member

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    So is it a case of dropping the valve block off, getting a set of the Viton O rings from Craig and careful replacement?

    @Craiglxviii - would value your input/insight.
     
  13. alexanderfoti

    alexanderfoti Moderator

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    About right yes!
     
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  14. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Oh the pentosin is halfway between the two ‘notches’ on the reservoir dipstick, engine off and cold.
     
  15. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Sounds easy when I say it fast :) :)
     
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  16. alexanderfoti

    alexanderfoti Moderator

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    It's low then, should be inside the top recess (with the top and bottom of the top recess being high and low) with engine off.
     
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  17. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Thanks, just going to go get some.
     
  18. Craiglxviii

    Craiglxviii Senior Member

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    Just be aware, I’ve misplaced my o-rings stock box since moving house. Ask Phil @Welwyn Merx as he has some of mine as spares for his own work.
     
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  19. OP
    Flyinspanner

    Flyinspanner Senior Member

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    Ok, thanks.

    I’ve been searching in vain for a thread with a detailed guide to refurb of the valve block (sure I’ve seen one) do you have any links?
    (Was it another site?)

    I’m pretty competent, and understand the need for absolute cleanliness, lint free, etc. Are there any really tricky bits to this, or is it all fairly straightforward?

    Are there any special tools required?

    Torque settings?
     
  20. OP
    Flyinspanner

    Flyinspanner Senior Member

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    And would the system need bleeding after it is it self bleeding?

    How would one bleed it?
     

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