SYSTEM, Closed Crankcase Ventilation (CCV): Operation: Operation
The CCV system reroutes crankcase ventilation (blow-by) gases from the breather assembly back into the engine intake airflow to be used for combustion. The crankcase ventilation system uses a coalescing filter (2) which captures and filters crankcase blow-by gases and then returns oil directly to the sump.
The Closed Crankcase Ventilation System (CCV) consists of several parts to make it functional. One part is the breather element (1). The breather element (1) is serviceable and prevents oil mist from entering the discharge tube of the CCV system. The breather element (1) should be replaced at 67,500 mile intervals.
Crankcase gasses travel into the breather cavity under the breather cover where they pass through a filtering media (serviceable maintenance component) which separates the oil from the crankcase gasses. The oil drains back into the engine block through two hoses (2) on the left side of the engine.
The crankcase gasses are directed through the Crankcase Depression Regulator (CDR) valve which allows the system to maintain a constant positive pressure in the crankcase. The CDR valve is a non-serviceable component located on the underside of the breather cover. Clean crankcase gasses flow from the CDR valve into the fresh air side of the turbocharger compressor.