Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Emission Control System and Vacuum Fitting MSA5TCD00L18131

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MSA5TCD00L18131


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                     LEGACY (W2260BE_SGML Complete)



2-1     [M300]                   MECHANISM      AND FUNCTION
3. Crankcase Emission Control System


3. Crankcase Emission Control System
D The positive crankcase ventilation (PCV) system is employed to prevent air pollution which will
be caused by blow-by gas being emitted from the crankcase.
The system consists of a sealed oil filler cap, rocker covers with fresh air inlet, connecting hoses,
PCV valve and an air intake duct.
D At the part throttle, the blow-by gas in the crankcase flows into the intake manifold through the
connecting hose of crankcase and PCV valve by the strong vacuum of the intake manifold. Under
this condition, the fresh air is introduced into the crankcase through connecting hose of rocker
cover.
D At wide open throttle, a part of blow-by gas flows into the air intake duct through the connecting
hose and is drawn to the throttle chamber, because under this is condition, the intake manifold
vacuum is not so strong as to introduce all blow-by gases increasing with engine speed directly
through the PCV valve.




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