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  #1  
Old 02-05-2007, 08:32 PM
Ken92SVX Ken92SVX is offline
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Location: Colorado Springs, CO
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Oil leak from bottom front of intake manifold

I have an oil leak underneath the front of the intake manifold coming from the big round cylinder looking thing.
What is this and what could cause an oil leak?
With a mirror I looked underneath the intake manifold and it looks like there is and O-ring and a shaft, what is this and is a leak common there?
I also just realized that I am burning/using oil which I never noticed a problem before. Could this by blow by cause by a bad PCV valve?
Thanks, in advance.
Ken
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Old 02-05-2007, 08:52 PM
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Beav Beav is offline
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Significant Technical Input
Oil in the intake comes from the crankcase, from two directions. At idle and constant speed, vacuum pulls it in through the PCV valve. Under hard acceleration, it comes in through the breather hoses, directly from the case and the valve cover separators. What you're seeing under the manifold is the IRIS valve, for the changing the induction resonance. It has a large butterfly attached to the shaft you see. As the hot oil vapor in the manifold condenses from the cool air, it collects in the bottom of the manifold, where the IRIS valve resides. It pools at the base of the valve and seeps out when the engine is at rest. It's all normal.

The PCV valve should at least be removed and cleaned every 10-15,000 miles, otherwise you'll probably notice some drips at various locations and/or your oil dipstick popping up.
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Old 02-16-2007, 07:07 PM
Ken92SVX Ken92SVX is offline
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Thanks

Beav,
Thanks for the reply!
I am so glad that we have resident experts such as yourself at this great cite!!
Ken
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