Description & Operation

Crankcase ventilation system is designed to control the flow of crankcase gas and vapors into the intake manifold to be burned by the engine rather than being discharge into the atmosphere. System is a closed type and consists of a positive crankcase ventilation (PCV) valve, oil separator, and connecting hoses.

Under normal driving conditions, fresh air is mixed with blow-by gas and passes through the PCV valve to be burned by the engine. Under heavy acceleration or high-speed driving, intake manifold vacuum decreases and blow-by gases exceed PCV valve capacity. The gases are then routed through the breather hose into intake tube to be burned by the engine.