MBE 4000 SERVICE MANUAL There is a force-feed lubricating oil circuit supplied by a gear-type oil pump. This pump is positioned at the rear of the oil pan and driven by gears from the crankshaft. The oil heat exchanger is located near the front of the crankcase on the right-hand side near the turbocharger. The gear-type fuel pump is located near the front of the crankcase on the left hand side. The pump is driven from the forward end of the camshaft. The air compressor, with a power-steering pump attached, is driven by a gear on the camshaft. The engine is cooled by a closed system using recirculated coolant; temperature is regulated automatically by a thermostat.
There are three drive belts, each with its own automatic belt tensioner. The alternator and coolant pump (and any other accessories) are driven by a main drive belt. The fan and the air conditioner compressor are each driven by their own drive belt. ELECTRONIC ENGINE CONTROL SYSTEM The engine is equipped with a fully electronic control system. Besides the engine and its related sensors, this system is composed of the DDEC-ECU, or engine control unit, and the DDEC-VCU, or vehicle control unit. The two control units are connected by a proprietary datalink through which all necessary data and information can be exchanged.
The DDEC-VCU then broadcasts all information on the J1587 and J1939 datalinks, where it can be read by minidiag2, Nexiq™ Diagnostic Data Reader (DDR), or Detroit Diesel Diagnostic Link ® (DDDL) PC software. The DDEC-ECU monitors both the engine and the datalink. When a malfunction or other problem is detected, the system selects an appropriate response; for example, the emergency running mode may be activated. All information subject to change without notice. 4 6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION