Positive Crankcase Ventilation: Description and Operation

CV Hose:

CV Tube:

SYSTEM DESCRIPTION

The PCV (Crankcase Ventilation) system used on this engine routes the blow by gases through an oil/air separator into the intake manifold. Unlike conventional PCV systems, it does not have 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 the 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 from the separator to the air intake duct of the air cleaner, draws gases from the separator under high air flow or low vacuum conditions. This allows the blow by gases to be recirculated back into the intake manifold for combustion.