Crankshaft rear main (flywheel) seal replacement involves removing the transmission, using BMW special tool 119260 or an equivalent to lock the flywheel, removing, loosening and discarding the flywheel bolts and removing the torque plate and flywheel. One should ensure that a thread in the crankshaft has been cleaned to apply a bolt on it. While installing the flywheel, it should be aligned dor to the dowel sleeve and the mounting holes on the torque plate on flywheel and on the torque converter should also align. Also, for a more rigid installation, it is required to use the new flywheel bolts.