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What's leaking now...2.5tdi Quattro?

Discussion in 'A4/S4 forum(B5 Chassis)' started by mixmaster, Jun 12, 2012.

  1. mixmaster
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    mixmaster Member

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    [Jun 12, 2012]
    I noticed at the last oil change that I have a slight leak which looks like it's coming from between the engine and gearbox.

    I get a little patch under the car.

    What's it likely to be and is it an easy fix? I don't seem to be using any oil.

    Thanks in advance.
    #1
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  3. marty.h
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    marty.h Member

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    [Jun 12, 2012]
    If its engine oil and coming from defo inside the bell housing on box will more then likely be the rear main oil seal. If its gear oil will be input shaft seal
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  4. mixmaster
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    mixmaster Member

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    [Jun 12, 2012]
    Thanks. An easy fix?
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  5. marty.h
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    marty.h Member

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    [Jun 12, 2012]
    Rear main will mean gearbox off and flywheel to replace seal

    Input shaft seal means gearbox off and not sure if the input shaft seal it a bolt on nose cone type or an internal seal worst case is box will need opening up to sort it
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  6. Tom_B
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    Tom_B Member

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    [Jun 12, 2012]
    Check that it's not hydraulic oil from the PAS
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  7. Bradderz_1988
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    Bradderz_1988 Dont replace it, Upgrade it !!

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    [Jun 12, 2012]
    ^^ as above all 3 could be your problem or even rocker cover gasket leaking down the rear and into the bell housing !
    #6
  8. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jun 12, 2012]
    what color is the oil?

    I'd expect engine oil on a TDI to be jet black, gear oil will be golden brown/reddy colored.
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  9. spartacus 68
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    spartacus 68 Active Member

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    [Jun 12, 2012]
    Agree with that. Even after a recent oil change it doesn't take long to go black. What's the mileage and age?
    #8
  10. mixmaster
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    mixmaster Member

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    [Jun 13, 2012]
    It's a 1998 coming up on 200k.
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  11. gedi
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    gedi Member

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    [Jun 14, 2012]
    what about sump gasket?
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  12. spartacus68
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    spartacus68 Member

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    [Jun 15, 2012]
    First thing to do would be to whip off the plastic sump guard, then get under the car for a closer inspection. Unusual for the sump gasket to go in my opinion.
    #11
  13. mixmaster
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    mixmaster Member

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    [Jul 30, 2012]
    I'm not losing engine oil but have noticed a drop in power-steering fluid so leaning towards this.

    However, why would that leak from round that area? What for and where should I be looking...
    #12
  14. mixmaster
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    mixmaster Member

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    [Jul 30, 2012]
    I forgot to quote this in my last post...
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  15. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Jul 30, 2012]
    PAS fluid usually leaks from the fittings on the cooler, or from the gaiters on the end of the rack.

    not sure how it would get inside the bellhousing though...
    #14
  16. mixmaster
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    mixmaster Member

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    [Aug 2, 2012]
    It might not be coming from inside the bell housing, just gathering around it then dripping from it.
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  17. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Aug 2, 2012]
    Stick your finger in one of the holes and see?

    My whole bellhousing was soaked in oil. Was pools of gear oil in the crevasses inside the housing.
    #16

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