Positive Crankcase Ventilation System

Positive Crankcase Ventilation System:

The Positive Crankcase Ventilation (PCV) system vents harmful blow-by fumes from the engine crankcase into the engine air intake for burning with the fuel and air mixture. The PCV valve limits crankcase blow-by gas to the fresh air intake to suit the engine demand and serves to prevent combustion from backfiring into the crankcase. Thus, the benefits from the PCV system include the ability to:
- Maximize the oil cleanliness by venting moisture and corrosion from the crankcase.
- Protect against crankcase explosions.
- Automatically regulate the ventilation system air flow to the engine air intake as required by engine operating conditions.





The Positive Crankcase Ventilation (PCV) valve is provided to regulate crankcase blow-by gas to the intake manifold. Normally, the capacity of the valve is sufficient to handle all blow-by and a small amount of ventilating air.