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What is this valve on top of the valve cover, it's NOT the PCV

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Old Apr 25, 2011 | 05:28 PM
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Default What is this valve on top of the valve cover, it's NOT the PCV

Just curious, what is the valve that sits on top of the valve cover on the drivers side called? I know it's not the PCV but it has a hose running from it to the air hat assembly. It is starting to leak/seap oil out of the top of it and into the hose.
 
Old Apr 25, 2011 | 05:38 PM
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It's called the 05h17, and oil creeping up toward the air filter indicates that you've got excessive pressure in the crankcase. It could be a failed PCV valve, crappy valve guides, bad rings, anything that pressurizes the crankcase.

I don't know the correct nomenclature of the thing. I've always called it the PCV elbow.
 
Old Apr 25, 2011 | 05:44 PM
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Originally Posted by UnregisteredUser
It's called the 05h17, and oil creeping up toward the air filter indicates that you've got excessive pressure in the crankcase. It could be a failed PCV valve, crappy valve guides, bad rings, anything that pressurizes the crankcase.

I don't know the correct nomenclature of the thing. I've always called it the PCV elbow.
Well that does not sound good. I just replaced the PCV valve with one from the dealership. How do I go about replacing this 05h17 thing? Do I just pull it straight out like the PCV or am I suppose to do something else?
 
Old Apr 25, 2011 | 05:51 PM
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No reason to replace it. All it is is just a sorta filter for air going into the crankcase. Not even sure if it filters at all. (I suspect not.)
 
Old Apr 25, 2011 | 05:55 PM
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What that hose is is the crankcase system intake hose. It takes filtered air (from the filtered side of your air filter) into the engine crankcase where it picks up the blowby and other polutants and then is sucked through the PCV valve so these "by products" can be burned.
If you replace the hose make sure you get emissions hose not fuel line. Emissions hose will not suck closed under vacum. It is attached to the valve cover and air cleaner by standard barbed fittings.

Oil coming up through it is def a BAD thing.
 
Old Apr 25, 2011 | 05:59 PM
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But what is the actual valve thing (05h17)? The hose is fine, there is just oil coming up through the top of the valve.
 
Old Apr 25, 2011 | 06:08 PM
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just an elbow. u can put in a push-in filter though if u wanted too. its just gettin air is all it does.
 
Old Apr 25, 2011 | 06:14 PM
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Couldn't tell ya the actual name of the thing, I always thought of it as a PCV (but it flows the opposite direction of the real pcv).... might be best to go to a dealership, remove the part (I'm about 90% certain that it pulls up just like the pcv... careful not to break it at the elbow) and take it to the parts guy. Make sure you indicate where it came from, it looks almost identical to it's brother on the passenger side.

Oh, and when you do actually find out what its true name is, post it up if you wouldn't mind... got my curiosity riled up now... I might just start calling it rumpelstiltskin to ease my mind if you don't.
 
Old Apr 25, 2011 | 06:51 PM
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Originally Posted by Seth_787446
But what is the actual valve thing (05h17)?
It's not a valve, just an elbow.

Here's the thing: Normal air flow through the crankcase from upstream to down is:

Air intake -> air filter -> hose -> elbow -> valve cover -> crankcase -> opposite valve cover -> PCV valve -> hose -> intake manifold.

So that oil you're seeing in the hose above that elbow is flowing upstream, against the normal air current. That's not supposed to happen.
 
Old Apr 25, 2011 | 07:46 PM
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and how do you fix that??
 



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