RAM 3500 HD Truck 2WD L6-6.7L DSL Turbo (2008)
Crankcase Filter: Description and Operation
DESCRIPTION
The Closed Crankcase Ventilation System (CCV) consists of several parts to make it functional. One part is the filter. The filter is serviceable and
prevents oil mist from entering the discharge tube of the CCV system. It is not cleaned, but replaced at 60,000 mile intervals.
The crankcase breather assembly is integrated into the cylinder head cover (3) and is serviced separately. The external fittings (2) to the breather tube
and breather drain tube are serviceable.
The crankcase breather assembly is integrated into the cylinder head cover and corresponding breather cover. 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.
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 syphoning 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.
TESTING
1. If troubleshooting high crankcase pressure, the following items can be causing the closed crankcase ventilation valve to close during engine
