Positive Crankcase Ventilation: Description and Operation

PCV System:

The PCV system used on this engine routes the blow by gases through an oil air separator and into the intake manifold. Unlike conventional PCV systems, it does not provide a fresh air inlet into the crankcase. Blow by gases flow through a hose from the timing chain housing into the separator, where oil is separated and drained back into the crankcase through an oil fill tube. A hose connected to manifold vacuum draws the gases from the separator at high vacuum conditions such as at idle and steady cruise conditions. Another hose, connected to the air intake duct of the air cleaner, draws gases from the separator under high air flow or low vacuum conditions.