AFB KGE Function: What it is and how it works | Posts 16+

Hello fellow enthusiasts,

I wanted to revisit the function of the crankcase ventilation (CCV) system. Today, I examined an older CCV unit. The pressure regulating valve is simply a spring with a rubber membrane that closes the opening for crankcase ventilation when there is a vacuum in the crankcase. There is NO connection from behind the membrane to the oil filter. The air from the crankcase is directly drawn into the filter media of the oil separator by the turbocharger.
Now, my question:

The oil filter module's collection container is equipped with a leaf spring that is attached to the bottom (the turbo's suction pressure therefore seals the return flow from the collection container to the crankcase. A vacuum in the crankcase can only originate from the turbo, meaning that the pressure above and below the leaf spring is the same. Therefore, the gases will directly take the path through the flow upwards to the turbo. How or why should the oil then flow back into the crankcase, or first flow into the collection container, if there is suction pressure upwards

For those who still want to replace the cyclone dust separator:
Part number 059 103 464 B (for AKE series).
Diese Teil muss nur gegen den Dichtsatz mit dem Filterflies ausgetauscht werden. Der Oelfilterhalter ist genau der selbe und braucht, sofern er nicht defekt ist, nicht gewechselt zu werden! Price: 52 EUR.

Best regards, Manuel.