Chris NottMonster Motorsport
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  1. #1
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    What's leaking now...2.5tdi Quattro?

    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.

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  3. #2
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    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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    Thanks. An easy fix?

  5. #4
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    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

  6. #5
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    Check that it's not hydraulic oil from the PAS

  7. #6
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    Dont replace it, Upgrade it !!

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    ^^ as above all 3 could be your problem or even rocker cover gasket leaking down the rear and into the bell housing !
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F21 Kit - 3" MAF - Saab Reds - THS Decat - Non Res Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - PFR6Q Plugs - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do/planned -Eibach pro's - GT2871/76R + FMIC + ME7 (maybe) + Engine/stroker Build

  8. #7
    "Stick a V8 in it!"

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    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.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  9. #8
    spartacus 68's Avatar
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    Quote Originally Posted by aragorn View Post
    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.
    Agree with that. Even after a recent oil change it doesn't take long to go black. What's the mileage and age?
    2010 Škoda Fabia 1.6 TDI CR (105) Elegance (31k)
    2002 A2 1.4 TDI SE (130k)
    2001 A4 2.5 TDi Avant Quattro Sport, aka Amrak Locomotive (162k)
    1995 80 TDI Avant SE (175k) Sold

  10. #9
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    Quote Originally Posted by spartacus 68 View Post
    Agree with that. Even after a recent oil change it doesn't take long to go black. What's the mileage and age?
    It's a 1998 coming up on 200k.

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    what about sump gasket?

  12. #11
    spartacus68's Avatar
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    Quote Originally Posted by gedi View Post
    what about sump gasket?
    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.
    Is that with or without VAT?

    2001 B5 A4 2.5 TDI Avant quattro sport (155k)
    2003 A2 1.4 TDI SE (125k)
    1995 80 TDI SE Avant (175k) sold

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    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...

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    Quote Originally Posted by Tom_B View Post
    Check that it's not hydraulic oil from the PAS
    I forgot to quote this in my last post...

  15. #14
    "Stick a V8 in it!"

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    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...

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  16. #15
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    Quote Originally Posted by aragorn View Post
    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...
    It might not be coming from inside the bell housing, just gathering around it then dripping from it.

  17. #16
    "Stick a V8 in it!"

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    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.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


 

 

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