GENERAL INFORMATION (CRANKCASE
EMISSION CONTROL SYSTEM)
The
crankcase emission control system prevents blow-by gases from escaping
inside the crankcase into the atmosphere.
Fresh air is sent from the
air cleaner into the crankcase through the breather hose.
The air
becomes mixed with the blow-by gases inside the crankcase.
The
blow-by gas inside the crankcase is drawn into the intake manifold
through the positive crankcase
ventilation valve.
The positive crankcase ventilation valve lifts the
plunger according to the intake manifold
vacuum so as to regulate the flow of blow-by gas properly.
In other
words, the blow-by gas flow is regulated during low load engine
operation to maintain
engine stability, while the flow is increased during high load operation
to improve the ventilation performance.
SYSTEM DIAGRAM
<6G72>
<6G75>