Crankcase Ventilation - Turbo: Notes

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DESCRIPTION

Courtesy of CHRYSLER GROUP, LLC

The Positive Crankcase Ventilation (PCV) System includes the following components:

COMPONENT INDEX

1.	PCV TUBE (DIRTY AIR TUBE)
2.	INTAKE MANIFOLD
3.	POSITIVE CRANKCASE VENTILATION (PCV) VALVE
4.	MAKE UP AIR (MUA) TUBE (FRESH AIR TUBE)
5.	CRANKCASE PRESSURE SENSOR
6.	MAKE UP AIR (MUA) CHECK VALVE
-.	MAKE UP AIR (MUA) OIL SEPARATOR (PART OF VALVE COVER)

OPERATION

There are two sides to the Positive Crankcase Ventilation (PCV) system. The dirty side of the system consists of the PCV Valve, installed on the Valve Cover Oil Separator, and the PCV Tube that connects between the PCV Valve and Intake Manifold. The clean air side of the system consists of the Make-Up Air (MUA) Tube, which connects between the MUA Oil Separator in the Valve Cover and the Air Induction System Inlet Duct, and Crankcase Pressure Sensor.

NATURALLY ASPIRATED OPERATION

When the engine is running Naturally Aspirated, clean air flows from the Fresh Air Hose, through the MUA Tube and MUA Oil Separator, to the crankcase. The crankcase vapors are pushed into the other Oil Separator in the Valve Cover. Engine vacuum draws the vapors into the Intake Manifold through the PCV Valve and PCV Tube where they are burned.

BOOST OPERATION

During boost operation, a check valve in the PCV closes blocking flow through the PCV Tube. The crankcase vapors flow out through the MUA Oil Separator and MUA Tube into the Turbocharger compressor housing, and eventually into the Intake Manifold where they are burned.