Exhaust Gas Recirculation (Egr) System - Detroit Diesel MBE 4000 Service Manual

MBE 4000 SERVICE MANUAL
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EXHAUST GAS RECIRCULATION (EGR) SYSTEM

The purpose of the Exhaust Gas Recirulation (EGR) system is to reduce engine exhaust gas
emissions in accordance with EPA regulations.
The EGR system consists of:
EGR Cooler
EGR Control Valves
Reed Valves
EGR Charge Air Mixer
The MBE 4000 engines for on-highway EPA 2004 regulation applications use a cooled
EGR system. Part of the exhaust gasses from the front three cylinders are routed from the
exhaust manifold through the EGR cooler, past control and reed valves, and are mixed with the
intake manifold charge air. The addition of cooled exhaust gasses back into the combustion
airflow reduces the peak in cylinder combustion temperature. Less oxides of nitrogen (NOx) are
produced at lower combustion temperatures.
The recycled exhaust gasses are cooled before engine consumption in a tube and shell engine
water cooler. See Figure 11.
1. Engine
2. Intake Air
3. EGR Modulated Valve
4. Reed Valves
Figure 11 Air flow Diagram through Engine with EGR System
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5. EGR Cooler
6. EGR Shutoff Valve
7. Exhaust Air
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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