BMW M2 M3 M4 S55 Engine Crank Hub Failure

July 30th, 2020 by

Problem:   The original flawed design allows the timing gear to spin independently from the crank, especially when the motor is modified by tuners that don’t have your best interest in mind. Best case scenario the motor needs to be re-timed with new components. Worst case, the valves contact the pistons requiring a complete overhaul. Common symptoms