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 valve is provided in the ventilation hose from
the rocker cover to the inlet manifold plenum. 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 plenum through the rocker cover and positive crankcase ventilation valve. During high
load driving, blow-by gas in the crankcase is induced to the inlet manifold plenum through the
rocker cover and positive crankcase ventilation 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 VALVE
Positive crankcase ventilation valve lifts the plunger according to negative pressure
at the inlet manifold plenum to create appropriate ventilation for the crankcase.
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