Exhaust System and Exhaust Gas Recirculation System

The Detroit™ Gen 5 Heavy Duty engine exhaust can be divided into two major systems, the exhaust system and the Exhaust Gas Recirculation (EGR) system. The exhaust system consists of a turbocharger, heat shields, an exhaust manifold, and its associated parts. Hot exhaust gas from the exhaust manifold is used to drive the turbocharger. For a listing of required exhaust system service intervals, see Preventive Maintenance Tables.

The EGR system consists of an EGR valve and actuator, EGR hot pipe, EGR venturi, EGR cooler, and its associated parts. The purpose of the EGR System is to reduce engine exhaust gas emissions in accordance with EPA regulations.

The EGR actuator opens and closes the EGR valve to allow hot exhaust gas to enter the EGR cooler. The EGR system dramatically reduces cuts NOx formation by routing a measured amount of cooled exhaust gases into the cylinders to lower combustion temperatures. Lower temperatures result in lower NOx levels.