IDENTIFICATION NOTE: In addition to the fourteen digit number etched on the crankcase, there is a ten digit number used for warranty and service that is found on the DDEC-ECU label. The ten digit number is derived from the fourteen digit number (see Figure 14). Charge-air cooling and an exhaust gas turbocharger are standard equipment on all MBE 900 engines (charge pressure limitation is optional). The engine has a fully electronic control system, which regulates the fuel injection quantity and timing using solenoid valves, allowing extremely low-emission operation.
Description of the Engine The control system consists of an engine-resident pump and nozzle control unit (the DDEC-ECU) and a vehicle control unit (the DDEC-VCU). The two are connected by a proprietary datalink. All MBE 900 engines are water-cooled, four-stroke, direct-injection diesel engines. The cylinders are arranged inline on both the 6-cylinder and 4-cylinder models. Each has a separate fuel injection pump (unit pump) with a short injection line to the injection nozzle, which is located in the center of the combustion chamber. The unit pumps are attached to the crankcase and are driven from the camshaft. Each cylinder has two intake valves and one exhaust valve.
Engine braking is controlled by a pneumatic and hydraulic (6-cylinder) operated exhaust brake on the turbocharger and by a constant-throttle system (optional). Figure 14 Engine Serial Number 22 All information subject to change without notice. (Rev. 04/08) DDC-SVC-MAN-0055 04/08 Copyright © 2008 DETROIT DIESEL CORPORATION