Positive Crankcase Ventilation: Description and Operation

Positive Crankcase Ventilation Hose Location:

The purpose of the positive crankcase ventilation system to prevent crankcase vapors from escaping into the atmosphere. A hose links the valve cover to a calibrated orifice in the intake system. The crankcase is subjected to constant vacuum, allowing blow-by gases to be drawn into the engine and burned. Baffles on the valve cover prevent lubricating oil from being drawn into the system.