Crankcase Ventilation Systems: Description

Peugeot vehicles use crankcase ventilation systems to prevent blow-by gases from reaching the atmosphere. Gasoline models use similar systems, which include a PCV valve with oil screen, manifold calibrated jet (orifice), air cleaner orifice, and connecting hoses. Diesel models have a hose from the valve cover to the intake manifold that recirculates crankcase vapors.