Crankshaft assembly Mechanical system Crankshaft Connecting rods The forged crankshaft with eight counterweights is supported by five bearings for effective vibration damping. The radiuses of the crank pins are rolled to give them high strength. In addition, the connection between the drive gear and crankshaft is friction welded. The weight-optimized connecting rods are made of forged steel and are cracked at the level of the bearing shells. Balance shafts The vibration damper is fixed to the crankshaft with a fourfold threaded connection. Two Lanchester balance shafts are integrated in the main bearing bridge and mounted on three roller bear- ings.
They are driven in opposite directions by the gear drive to counteract the inertia forces of the second order which are generated. This ensures smooth engine running. Crank assembly with gear drive 1 Oil and vacuum pump drive gear 2 Crankshaft gear 3 Crankshaft 4 High-pressure pump drive gear 5 Intermediate gears (tensioning gears) 6 Piston 7 Connecting rod 8 Vibration damper 9 Lanchester drive gears i Note The aluminum pistons run in friction-optimized cast-iron cylinder barrels. On this engine, they are all manu- factured uniformly. There is therefore no differentiation between A, B or X sizes on this engine.
15 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 –