Crankcase Vent: Description and Operation

The Positive Crankcase Ventilation (PCV) System consists of a draft-tube style throttle body insert (2) and hoses (1 and 3) connected between the cylinder head covers and the throttle body insert (2).




Crankcase ventilation is accomplished by means of a draft-tube style insert (2) protruding through the throttle body into the intake airstream (4). The crankcase gases are drawn into the intake manifold when air passing the tube insert creates a vacuum in the Crankcase Vent Hoses (1 and 3).