Ford 6.4L Power Stroke, Manual

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AIR MAnAgeMent SySteM
59
System Flow
• Air enters the system through the air filter where particles
are removed from the air. The air filter has a filter minder
on it to warn the operator of a restricted air filter.
• After the air is filtered, the mass of the air and temperature
are measured by the mass air flow sensor (MAF) and
the intake air temperature sensor #1 (IAT1).
• The filtered air is then directed past the crankcase ventilation
system where crankcase vapors and fresh air are mixed.
• After mixing with crankcase vapors the fresh air mixture is drawn
into the low pressure turbocharger compressor then the compressed
air is sent to the high pressure turbocharger where it is further
compressed before being sent to the charge air cooler (CAC).
• The (CAC) cools the compressed air via an air-to-air cooler,
then the condensed air passes through the EGR throttle, mixes
with cooled EGR gases, then enters the intake manifold.
• The intake manifold directs the cooled air to
the intake ports of the cylinder heads.
• The burned air fuel mixture is pushed out of the cylinder into
the exhaust manifold which collects the exhaust and routes
it to the high pressure turbocharger’s turbine wheel.
• The exhaust up pipe, connected to the passenger side exhaust
manifold has a passage that directs exhaust to the exhaust
gas recirculation (EGR) coolers and then to the EGR valve.
• The EGR valve controls the flow of exhaust into the intake
system where the gases are mixed with intake air to
reduce NOx (Oxides of Nitrogen) emissions and noise.
• The hot and expanding exhaust gases that are routed to the
series sequential turbocharger turbines, spin the turbine wheels
through flow and expansion. The spinning turbine wheels
then spin the compressor wheels via common shafts.