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M52TU B25 And B28 Engines: Crankshaft

The crankshaft of the 2.5 liter displacement engine is made from cast iron. The 2.8 liter engine uses a forged steel crankshaft due to the "higher torque". Both crankshafts are mass balanced. The crankshafts feature seven main bearings with the thrust bearing located at the #6 main journal area.

Fig 1: Cut-Away View Of Crankshaft
G03395932Courtesy of BMW OF NORTH AMERICA, INC.