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Home >> Subaru >> 2004 >> Outback Base, 4D Sedan >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Emissions Control (H6DO) - Mechanism & Function >> Crankcase Emission Control System

Crankcase Emission Control System

The positive crankcase ventilation (PCV) system prevents air pollution which will be caused by blow-by gas being emitted from the crankcase.

The system consists of rocker covers with fresh air inlet, connecting hoses, a PCV valve and a chamber.

Fig 1: Identifying Crankcase Emission Control System Component
G03321581Courtesy of SUBARU OF AMERICA, INC.