Ford Transit 2002 Owner's Manual page 1101

5
6 -
The PCV system consists of a crankcase vent oil separator connected to the crankcase and
valve cover by hoses.
The crankcase pressure is controlled by a diaphragm operated PCV valve built into the valve
cover and cannot be removed. As the pressure in the crankcase vent oil separator reduces,
the diaphragm valve closes against the force of the PCV valve spring, so closing the PCV
valve. As the crankcase pressure rises, the PCV valve is pushed open assisted by the PCV
valve spring. This allows the positive crankcase gasses to be scavenged by the air intake
system.
Valve cover to air intake pipe PCV hose
PCV valve spring
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