Flywheel

Fly Wheel:

The starter ring gear and torque converter flexplate are bolted together to the crankshaft flange with 9 bolts as on the M70 engine.

What is new for the M73 is the incorporation of an incremental gear wheel that is monitored by the DME control modules for crankshaft speed and reference. This gear wheel takes the place of the vibration damper pulse wheel. Like the previous vibration damper pulse wheel, the incremental gear wheel has 58 teeth with a gap of two missing teeth.

The M5.2 Motronic system has an expanded function that will utilize the speed and reference signal to detect engine misfiring. The misfire detection feature requires a more precise monitored reference to recognize a misfire. Since the flywheel ring gear has more surface area than the vibration damper the flywheel is now used for all crankshaft related monitoring.