8
Overview
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
q
Highlights
New features
Based on the use of the latest innovative technologies,
engine 651 sets a new standard in terms of output and
torque characteristics, economy, exhaust emission
levels and smooth running. The engine features a
number of new developments which cannot be found
in this combination in any other series-produced
passenger car diesel engine.
Technology
The most important technical features of the new
engine are:
• Dual stage turbocharging with fixed geometry
• Directly actuated piezo injectors
• Gear drive in combination with a chain drive on the
output side
• Intake air-cooled engine control unit
on air filter housing
• Main bearing bridge with integrated
Lanchester housing
• Two Lanchester balance shafts
• Drive gear friction welded to crankshaft
• Vibration dampers
(quadruple bolted)
• Universal timing case cover for adaptation to
va
rious transmission models
• Major assembly carrier with variable arrangement
as per vehicle
concept
• Two knock sensors
• Two-piece oil pan (noise optimized)
• Oil pan bottom section made of plastic
Thermal management
The new thermal management system consists of:
• Shutoff-capable coolant pump
• Cylinder head with two-piece water jacket
• Shutoff-capable oil spray nozzles combined with
pisto
n crown cooling
• Oil pump volume-controlled at clean oil side
i Note
Further information on repairing and maintaining
engine 651 can be found in the Workshop Informa-
tion System (WIS).
i Note
Friction-welded connections involve connecting
two parts together by force. The application of fric-
tion and pressure produces a fixed connection
without the use of welding consumable.
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