It is a filtered opening in one of the valve covers and allows the PCV to draw filtered air through the crankcase.
Engine Breather Systems
Inside an engine internal pressure is produced within the crankcase. This pressure is generally caused by a small leakage of combustion gasses past the piston rings, this is known as blow-by. If this pressure is not released, the subsequent build up can cause gaskets and seals to fail, creating engine oil leaks.
Engine oil coming from breather pipe
To remove a struck breather gear from a Harley engine you need to follow the instructions on the user manual.
on top of the engine block
The engine blow by is exhaust gasses trough out the breather pipe
Engine is severely worn.
on top of the valve cover
The oil might be getting into the air breather of your 2000 S10 pickup if there is a leaky gasket on the engine. It could also indicate the air breather housing is cracked.
The Gaseous buildup inside of the internal combustion chamber would cause engine failure, the engine to blow, and explode litterally
The PCV or positive crankcase ventlation valve does as it is named. It will remove harmful gases from the engine. Also, you can find breather caps on the valve covers, this also helps to remove and fumes from the crankcase or engine base.
To allow the transformer to "free breathe" and yet prevent any moisture from entering. The desiccant in the breather removes any moisture in the air before it enters the tank or conservator.
in engine cover.it connects to the breather hose on the RHS of the engine cover.
If White smoke with oil come out from DDC running Engine Breather out let, it symptoms of Piston Ring set wear out and injector has to be calibrated,