System, Closed Crankcase Ventilation (CCV): Description
The CCV system contains the following components:
- Cylinder Head Cover Assembly (7)
- Breather Element (2)
- Breather Cover (1)
- Crankcase Pressure Sensor (3)
- Crankcase Differential Regulator (CDR) Valve; a part of the breather filter cover (1)
The cylinder head cover assembly (7) is made of a composite material. The cover has a recessed area for the breather element and passages for oil draining from the breather element, back to the crankcase. The breather element is serviced separately. The drain tubes have one-way check valves (4), (5) and (6) that prevent oil from being forced up the tubes by excessive crankcase pressure. The external fittings to the breather tube and breather drain tube are serviceable.
The closed crankcase ventilation valve is used to vent the crankcase gases back into the intake of engine. If the crankcase ventilation filter becomes too restrictive, under high intake vacuum situations, the closed crankcase ventilation prevents the engine from siphoning crankcase gases/oil from the crankcase of the engine. The closed crankcase ventilation valve is located under the crankcase ventilation filter cover at the top of the engine.