RAM 5500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2008)
Positive Crankcase Ventilation Valve: Locations
OPERATION
To comply with engine emissions regulations, a CCV (Closed Crankcase Ventilation) system has been developed for the 6.7L Cummins diesel. 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 CCV system contains the following components:
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Valve Cover Assembly (7)
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Breather Filter (2)
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Breather Filter Cover (1)
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Crankcase Pressure Sensor (3)
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Crankcase Differential Regulator (CDR) Valve; a part of the breather filter cover (1)
The valve cover assembly (7) is made of a composite material. The cover has a recessed area for the breather filter and passages for oil draining from the
breather filter, back to the crankcase. 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 Crankcase Pressure (CP) Sensor (5) is mounted on the valve cover (4). The CP sensor monitors crankcase pressure that builds up as the result of
combustion gas blow-by. The Engine Control Module (ECM) uses data from the CP sensor to determine the condition of the crankcase breather
(ventilation) filter. The ECM can also determine if a crankcase breather (ventilation) filter is present.
