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Excessive Crankcase Pressure... Leaking lots of oil. PCV system is in place and working. What next? 120-130 1966

uid 15053's pic
posted by  Dylan Berichon on  Wed Aug 18 14:03 CST 2010
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last visit: Thu Oct 23 17:22 CST 2014
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Greetings all,

To make a long story short, the b-20 my 122 currently has continues to lose a significant amount of oil, and it seems to be due to too much pressure in the crankcase.

The fuel pump is sealed and no longer leaks oil. The valve cover isn't leaking either.

Now oil seems to be coming from the front Carb filter. (I'm guessing that this is due to the hose that connects the oil filler cap and the front filter.)

With that hose removed, the engine pumps air out from the valve cover. It's my understanding that air should be sucking in through there instead.

I've removed everything that might be blocking the PCV system. Hoses are clear, the PCV valve is in the correct position and working correctly. I even completely removed the flame trap to let the engine breath better. None of it is making a difference.

What is causing this? The motor now has about 10K miles on it from a complete rebuild with new parts. Overbored 30 with new pistons and rings. Everything inside is new.

I'm stumped. Any advise is appreciated. I'm tired of leaving oil stains everywhere I go!

Thanks as always.
--
http://dylans122.blogspot.com






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New Excessive Crankcase Pressure... Leaking lots of oil. PCV system is in place and working. What next? [120-130][1966]
posted by  Dylan Berichon  on Wed Aug 18 14:03 CST 2010 >


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