Mechanical system
15
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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Crankshaft assembly
Crankshaft
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 vibration damper is fixed to the crankshaft with a
fourfold threaded connection.
Connecting rods
The weight-optimized connecting rods are made of
forged steel and are cracked at the level of the bearing
shells.
Balance shafts
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.
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.
Crank assembly with gear drive
1 Oil and vacuum pump drive gear
2 Crankshaft gear
3Crankshaft
4 High-pressure pump drive gear
5 Intermediate gears
(tensioning gears)
6Piston
7 Connecting rod
8Vibration damper
9 Lanchester drive gears
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