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ENGINE COMPONENT AND LOCATION 107
EGR Cooler
The EGR valve is connected to the EGR cooler by the cooler inlet pipe. Using
engine coolant, the EGR cooler lowers the temperature of the gas coming from the
EGR valve. The cooler contains a series of vanes that increase cooling efficiency by
swirling the hot gas before it enters the mixer.
EGR Venturi System
On leaving the EGR cooler, the gas flows through a venturi equipped with two
pressure sensors. The venturi changes the speed and density of the flow. The sensors
report the pressure difference to the EECU.
EGR Cooler Outlet Pipe
The EGR cooler outlet pipe carries the exhaust gas from the venturi to the mixer.
Relatively short, the tube passes over the valve cover, behind and into the mixer at the
front end of the inlet manifold on the conventional chassis engine.
Relatively much longer on the LCF, the tube passes from the venturi around the front
of the valve cover and reaches back to the mixer at the rear end of the inlet manifold.
A temperature sensor monitors exhaust temperature sending the data to the EECU.
Excessively high temperature, or abnormally high temperature for more than 30
minutes during an hour, causes the EECU to limit engine power to prevent engine
damage.
EGR Mixer
The EGR mixer is the meeting point for cooled, recirculating exhaust gas and outside
air from the CAC. From here, the combined gases pass into the inlet manifold and
on to the combustion chamber.
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