Beretta L4-138 2.3L DOHC QUAD 4 (1991)
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.