Engine - Mercedes-Benz OM 471 Introduction Into Service Manual

Engine

SN00.00>W>0002>04H Engine OM!471
1 Amplified Pressure Common>Rail
System (APCRS)
2 Diesel fuel>metering device (for
regeneration of diesel particulate
filter (DPF))
3 Oil/coolant module
The engine OM 471 is the first 6>cylinder inline engine with two
overhead camshafts to be used in a Mercedes>Benz commercial
vehicle.
Both camshafts are driven by a gear drive which is located at the
output side of the engine. The position of this drive gear makes a
major contribution to reducing noise emission.
The extremely compact design of the engine is based on the
optimized cylinder liner concept in which the overhead seat is
located at the bottom in the crankcase > this design measure
allows the gap between the cylinders to be reduced considerably.
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The positive properties of the new engine have been made
possible by a variety of new technical developments:
The new injection system, the amplified pressure common
•
rail system (APCRS) (1), is the first common rail system to be
used in Mercedes>Benz commercial vehicles that minimizes
the quantity of fuel required for combustion. The advantage
of this system lies in the fact that the rail and high>pressure
lines have a relatively low pressure of 900 bar, and the fuel
pressure required for injecting into the injector is generated,
which has a particularly positive effect on material loads and
therefore on component longevity.
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i With each maintenance and repair work to the engine as well
as to the ancillary assemblies and detachable parts comes the
danger of property damage caused by soiling and foreign bodies.
The high pressure diesel injection system, the intake system and
the oil circuit, in particular, are at risk here.
10
4 Fuel filter module
5 Compressor
6 Power steering pump
7 Oil separator for crankcase
ventilation system
8 Turbocharger
– This printout will not be recorded by the update service. Status: 09 / 2011 –
9 Cooled and regulated exhaust gas
recirculation (AGR)
G2 Generator
The OM 471 engine is available in four output stages between 310
and 375 kW.
Advantages of new 6>cylinder inline engine:
• Lower fuel consumption in relation to high output
• Smooth running characteristics, whereby only four
counterweights are required on the crankshaft
Excellent application capability for the various emissions
•
standards
• Implementation of particularly high combustion pressures of
up to 230 bar
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The completely redesigned engine brake system has an even
•
higher braking power.
• The cooled and regulated exhaust gas recirculation (EGR) (9)
and the diesel particulate filter (DPF) as well as the modified
oil separator of the crankcase ventilation system (7) ensure
that tomorrow's emissions regulations can also be met.
• The regulated coolant pump installed in the oil/coolant
module (3), which has already been installed in Actros
vehicles, also contributes to fuel economy.
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To avoid any damage, when conducting repair work not only the
specified special tools must be used along with observance of the
WIS repair instructions, but in addition to this special care must be
given to cleanliness at the workbay.
Additional information is available in the document
AH00.00>N>5000>01H.
W01.10>1090>09