Highlights Overview New features Thermal management 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. 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 piston crown cooling Oil pump volume-controlled at clean oil side 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 various 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 i Note 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. Further information on repairing and maintaining engine 651 can be found in the Workshop Informa- tion System (WIS). 8 Introduction of New Generation of 4-Cylinder Inline Engines, OM 651 q – This printout will not be recorded by the update service. Status: 09 / 2008 –