Positive Crankcase Ventilation: Description and Operation

POSITIVE CRANKCASE VENTILATION SYSTEM

Overview

PCV System:

The Positive Crankcase Ventilation (PCV) System (Figure 133) cycles crankcase gases back through the engine where they are burned. The PCV valve regulates the amount of ventilating air and blow-by gas to the intake manifold and prevents backfire from traveling into the crankcase. The PCV valve is designed with a quarter-turn cam-lock thread at one end to prevent accidental disconnection from the valve cover.

CAUTION: Do not remove the PCV system from the engine. Removal of the PCV system will adversely affect the fuel economy and engine ventilation and result in shorter engine life.

Hardware

PCV Internal Drawing:

PCV Vacuum Connector: