Crankcase Vent Hose: Operation

Fig 1: Locating Draft-Tube Style Insert

Courtesy of DAIMLERCHRYSLER CORP.

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).