Detroit Diesel DD15 EuroIV Operator's Manual page 57

DD Platform EuroIV Operators Manual
resulting in cooler exhaust gas to the cylinders. EGR lowers the temperature of the
exhaust from the engine, therefore, reducing exhaust gas emissions to acceptable
levels.
The purpose of the Exhaust Gas Recirculation System (EGR) is to reduce engine
exhaust gas emissions in accordance with EPA regulations.
The EGR system has been optimized to dramatically cut NOx formation by routing
a measured amount of exhaust flow to the cylinders to lower combustion
temperatures. Lower temperatures result in lower NOx levels without the negative
effects of retarding engine timing. The EGR valve has been moved to the top of the
engine for improved serviceability.
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All information subject to change without notice.
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