Want this question answered?
http://www.bimmerfest.com/forums/showthread.php?p=3672529
open crankcase ventilation and closed crankcase ventilation.
In pre-PCV (Positive Crankcase Ventilation) vehicles, that was a term for the crankcase ventilation pipe.
It vents the gasses that form inside the crankcase to the intake. It is a small round valve located on the top of the valve cover. They are inexpensive and easy to replace.
positive crankcase ventilation
Be sure the PCV (Positive Crankcase Ventilation) system is in good working order.
To find the positive crankcase ventilation valve, look on the right bank of the engine. The valve is located beneath the intake manifold.
That would be part of the crankcase ventilation system. I guess you could call it the air filter housing to engine crankcase ventilation tube.
No, the crankcase ventilation systems employed on diesels are not PCV (Positive Crankcase Ventilation) systems. They are CCV (Closed Crankcase Ventilation) systems. Diesels do not produce sufficient vacuum for a PCV system. They use only a crankcase breather which is vented to the filtered side of the intake ducting. The engine can "breathe" both in and out via the breather cap. The round black thing on the TDI valve cover is a breather cap.
Exhaust gas recirculation and crankcase ventilation are two different things, and not related. EGR allows some exhaust gas to enter the combustion chamber to reduce combustion temperature, crankcase ventilation usec a pcv to remove oil vapor from the crankcase.
PCV is positive crankcase ventilation
Under the intake manifold!