2nd Gen JCW Most liked posts in thread: Has anyone else experienced a valve cover gasket leak after installing a boost tap?

  1. CHKMINI

    CHKMINI Club Coordinator
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    #2 CHKMINI, Apr 17, 2013
    Has anyone else experienced a valve cover gasket leak after installing a boos...

    This is an interesting scenario. The valve cover has a pressure release valve built into it located center rear which has a plastic plug in it. You would think that pressure high enough to force oil through the gasket would first release through the valve. I'm watching this thread closely since I too just installed an OCC with the boost tap.
     
  2. minirab

    minirab Well-Known Member

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    #3 minirab, Apr 17, 2013
    I have an occ on my R58 JCW and was advised by WMW not to use the

    boost tap.
     
  3. 05r50

    05r50 Well-Known Member

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    #4 05r50, Apr 17, 2013
    So Mark,

    I did find this post from k-huevo pointing out that the valve cover oil/air separator may stop working and that could cause the gasket to leak. http://www.motoringalliance.com/forums/jcw/10871-positive-crank-case-ventilation.html#post101516

    Here is an image of what he posted. He was referring to the orange disk just like we were discussing earlier today.

    [​IMG]

    I also called the boost tap maker and spoke to them. They did say that with the tap in place it would increase the pressure but didn't say by how much. Putting these 2 things together it does sound reasonable that if the oil/air separator is clogged then that relief port on the back would be of no beneift as it would not be working.
     
  4. Metalman

    Metalman Well-Known Member
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    #5 Metalman, Apr 18, 2013
    I have the rear facing PCV port closed with the Audi caps (Plastic pipe completely removed and capped at the intake manifold and valve cover), with no current leaks. The cold side turbo PCV connection is still functional through my OCC. I did get the rear pressure vent to pop and I feel that was due to short runs to work this winter without getting the engine hot enough to completely purge all of the water condensation.... This condensation makes large quantities of "Mayonnaise" that is a blend of PCV oil and water moisture. The pressure relief valve blew a small quantity of oil towards the air filter housing. Now that the engine temperature reaches 220F, the "Mayonnaise" is gone and the relief valve stays closed.
    Jeff... Somehow you need to make sure the PCV oil trap maze in the valve cover isn't plugged.....