Quote:
Originally Posted by 335dsleeper
I know you fail to understand. It’s because you are not familar with m57.
Look at an m57 valvecover. You’ll see where the top 6 intake runners go through the center of the cover. When the gasket gets old, it leaks allowing boost pressure to enter the valvecover, which causes oil leaks.
This is becoming more common as the engines age. I swapped mine a few weeks back because it was leaking. Few others have leaks from the fill cap when their gasket failed too.
Might want to search the 335d forum. It’s more technical than here.
So, it simply does happen
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I see your point. I did not account for valve cover gasket also sealing the inside of the cover the runners (the 12 rings) channeling air from intake manifold (swirl flaps side):
So, it seems like a quick remedy for excessive pressure in valve cover from boost leaks is to delete swirl flaps:
http://www.fixmyvw.com/swirl-flap-de...5d-and-x5-35d/
Will require tuning to turn off swirl flap error codes.