1
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Positive crankcase ventilation (PCV) hose and one-way valve
2
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Valve cover oil separator
4
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Crankcase vent oil separator
The PCV system recycles crankcase gases back through the engine where they mix with the incoming air/fuel charge.
The PCV valve regulates the amount of ventilation air and crankcase gas supplied to the intake manifold and air cleaner. This also prevents backfiring into the crankcase.
The PCV system helps to reduce hydrocarbon emissions from the engine.