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Thread: Oil Leak 3.0L D4 - Oil cooler and filter assembly -should it have a hole here!

  1. #11
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    Mar 2016
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    No itís no a defect. Iíll take a photo of it tonight. Yours will have it too. Itís a manufacturing element
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  2. #12
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    Jan 2010
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    video of one



    You can see the hole at about 20 seconds in.

  3. #13
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    Sep 2014
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    Baldivis WA
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    Still baffles me at this point what the hole in question in the body is for...

  4. #14
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    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  5. #15
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    Sep 2014
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    Baldivis WA
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    Here's mine, bit of crud in the bottom of the recess, but no oil leak. Thinking about it a bit more, i think this hole is part of the upper housing casting riser or release, i.e. somewhere to lift the casting out of the mould once cooled. So the oil must come from the cooler/heat exchanger underneath if thats failed or cracked somewhere or the seals themselves.

    20190612_211617.jpg

    The oil on the left hand side is from the drivers side y piece throttle body to manifold seal.

  6. #16
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    May 2016
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    On a couple of cars and bikes Iíve owned, there have been Ďwitness holesí to indicate an internal leak (usually a seal) of oil or coolant.
    My current bike has one on the side of the block to indicate a water pump seal leak (pump is internal).
    I suspect that the one in this discussion is for an internal oil seal of some description.
    Age and cunning will ALWAYS overcome youth and skill.

  7. #17
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    Sep 2014
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    Baldivis WA
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    528
    Quote Originally Posted by Hugh Jars View Post
    On a couple of cars and bikes Iíve owned, there have been Ďwitness holesí to indicate an internal leak (usually a seal) of oil or coolant.
    My current bike has one on the side of the block to indicate a water pump seal leak (pump is internal).
    I suspect that the one in this discussion is for an internal oil seal of some description.
    Makes sense. So via the tell-tale you can see whether youíve got a leak on the oil or coolant side of the cooler.

  8. #18
    Join Date
    Jan 1970
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    If it's the same as the 4.4's cooler then the top gasket seals both oil and coolant. I suspect that if the hole is a witness hole then it is used to check if the gasket between the housing and the cooler is leaking as it could be difficult to determine whether oil is emerging from the upper gasket or from the seals underneath the cooler.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS 2m rx igate

  9. #19
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    Ordered a couple of these weird seals that seal the oil air separator and block. I donít think theyíre leaking but figured while I had it all apart Iíd try and change them. I say try as I suspect theyíre going to be a real pain to extract as they are metal body with rubber seal so I predict theyíll be wedged in super tight.

    And after all this I still suspect itís the cam seals on the rear not the cooler, but as I canít explain the oil in the V Iíll do it all anyway.

    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  10. #20
    Join Date
    Jan 2010
    Location
    Sydney
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    140

    The hole again

    I have now had the oil cooler replaced and pulled the old one apart and looked what the hole might do. When you take the top off the housing you can see the oil and coolant journals. The hole in question comes thru to a void between an oil and coolant journal. So if no hole, I guess a pocket of air expanding and contracting until it does something. With the hole , if oil leaks in you see oil, if coolant leaks in you see coolant. If you have oil and block it (as I did), then oil might then push into the coolant. I think this is what happened when I blocked it as after about 2k I noticed some oil in coolant, so in process of getting that out now that its repaired.

    Regards
    Gerry



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