Scope And Use Of This Manual; General Description - Detroit Diesel MBE 4000 Service Manual

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SCOPE AND USE OF THIS MANUAL

This manual contains complete instructions on operation, adjustment (tune-up), preventive
maintenance, and repair (including complete overhaul) for the MBE 4000 engine. This manual
was written primarily for persons servicing and overhauling the engine. In addition, this manual
contains all of the instructions essential to the operators and users. Basic maintenance and
overhaul procedures are common to all MBE 4000 engines, and apply to all engine models.
This manual is divided into numbered sections. Section one covers the engine (less major
assemblies). The following sections cover a complete system such as the fuel system, lubrication
system, or air system. Each section is divided into subsections which contain complete
maintenance and operating instructions for a specific engine subassembly. Each section begins
with a table of contents. Pages and illustrations are numbered consecutively within each section.
Information can be located by using the table of contents at the front of the manual or the table of
contents at the beginning of each section. Information on specific subassemblies or accessories
within the major section is listed immediately following the section title.

GENERAL DESCRIPTION

The MBE 4000 Engine described in this manual is a water-cooled, four-stroke, direct injection
diesel engine. The cylinders are arranged in line. Each cylinder 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 two exhaust valves.
Charge-air cooling and an exhaust gas turbocharger are standard equipment on all MBE 4000
engines.
The engine has a fully electronic control system, which regulates the injection quantity and timing
using solenoid valves, allowing extremely low-emission operation. 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.
Engine braking is controlled by a pneumatically-operated exhaust brake on the turbocharger and
by a constant-throttle system. For greater braking power, an optional turbo brake is available.
The cylinder block has integrated oil and water channels. The upper section of the cylinder bore
is induction-hardened. The six individual cylinder heads are made of cast iron. The cylinder head
gasket is an adjustment-free seal with rubber sealing elements.
The pistons are made of aluminum alloy with ring carriers and a shallow combustion chamber
recess. The pistons are cooled by oil spray nozzles.
The crankshaft is precision-forged with seven main bearings and eight custom-forged counter
weights, and a vibration damper at the front end.
The camshaft is made of induction-hardened steel and has seven main bearings. Each cylinder has
cams for intake and exhaust valves and a unit pump.
The valves are controlled by mushroom tappets, pushrods, and rocker arms. The intake and
exhaust valves are opened and closed by a valve-guided bridge.
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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MBE 4000 SERVICE MANUAL
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