How much oil are we talking about? If there is oil dripping from it and running down the engine and dripping on the ground, yea sounds like too much oil. If its just grimey in oil, that "may" be normal.
It may need to be just cleaned, sounds like your overdue.
The PCV valve often gets coated in oil, several cars I've owned from V-8's to I-4's the PCV and the tubes leading to/from it gets grimey in oil.
If the PCV valve was really malfunctioning it could make tapping noises, create a vacuum leak (which would have the symptoms of a vacuum leak) and allow oil past it to be ingested and burned by the engine (which would have the symptoms of engine burning oil). Of course those symptoms could indicate a serious and expensive problem with the motor, that can fixed by replacing the cheap PCV or even cheaper, just cleaning it.
The engine crankcase will have moisture from condesation, blowby, combustion byproducts, heat creating caustic fumes and other contaminants collect in it. Those contaminants will break down the oil, increased wear from poor lubrication, cause sludge and deposits.
Circulating fresh air through the crankcase and sucking out the moisture and fumes will have a huge positive effect on preserving the oil and the engine.
The "Positive Crankcase Ventilation (PCV)" valve is a flow control valve that uses vacuum from the intake manifold and meters it and stops back flow from surges the crankcase (pistons moving up and down create air pressure surges) backflowing into the intake manifold. So in normal operation it will suck in some oil from the crankcase and it will collect a bit by the PCV valve, it gets dirty, varnished, clogged with debri, etc it won't meter the air flow right and might start sucking up more oil than it should from the crankcase and/or allowing to much vacuum loss to the intake manifold.
Usually its just a spring loaded, weighted piston with a nozzle end that moves back forth with the air pressure to reduce/increase airflow and totally close the opposite direction to prevent backflow. So you can imagine how getting dirty can restrict the piston and cause it NOT to meter the airflow right. It might make the piston slam back and forth and create a tapping noise.
Some engine use an orifice instead of a piston.
Not sure on the Hemi PCV, never seen a PCV that big and I suspect looking at the parts it might be some sort of baffled/chambered orfice deal that also acts as a catch can for the oil. If that is true, then it is even more important to clean it periodically because oil would be collecting in it that has to be drained. If the oil isn't drained it would likely be forcing it way out of the can.
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Last edited by Mongo; 09-15-2014 at 09:25 AM.