Positive Crankcase Ventilation: Description and Operation

POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM

Positive Crankcase Ventilation (PCV) System









PCV System Description

- The PCV system cycles crankcase gases back through the engine where they are burned.

PCV System Operation





PCV Valve

- Mounted in a vertical position
- 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