CRANKCASE VENTILATION SYSTEM





A blow-by gas reduction device prevents blow-by gas from being expelled into the atmosphere and is of closed type. A positive crankcase ventilation (PCV) valve is provided in the ventilation hose from the rocker cover to the inlet manifold. During low load driving, clean air is supplied to the crankcase by the air intake hose via the breather hose and rocker cover, and it mixes with the blow-by gas in the crankcase. The blow-by gas in the crankcase is induced to the inlet manifold through the rocker cover and PCV valve. During high load driving, blow-by gas in the crankcase is induced to the inlet manifold through the rocker cover and PCV valve and at the same time also via the air intake hose and throttle body due to negative pressure in the air cleaner.

POSITIVE CRANKCASE VENTILATION (PCV) VALVE



PCV valve lifts the plunger according to negative pressure at the inlet manifold to create appropriate ventilation for the crankcase.