Acclaim L4-153 2.5L SOHC Turbo (1989)
Positive Crankcase Ventilation: Description and Operation
PCV System
This system is used to prevent the emission of blow-by gases from the engine's crankcase. These blow-by gases are the result of high pressures developed
within the combustion chamber during the combustion process and contain undesirable pollutants.
When the engine is running, air is drawn by manifold vacuum from the air cleaner through a hose, to the crankcase inlet air cleaner. From the crankcase
inlet air cleaner, the air mixes with the vapors in the rocker arm chamber and crankcase and are then drawn up through the PCV valve in the cylinder
head cover to a hose connected to the intake manifold. These gases become part of the calibrated air/fuel mixture and are then drawn into the combustion
chamber, burned, and expelled with the exhaust gases.
