With the N62 engine, as standard, an automatic transmission with a drive disk is used. The drive disk, and the automatic transmission torque converter connected to it, serves as a flywheel for the engine.
The drive disk is attached to the crankshaft flange with nine bolts (3). After removing the drive disk, replace the mounting bolts with new ones, having previously applied a locking compound to their threaded part. Due to the presence of a centering sleeve (2), the drive disk is installed in only one position. Before pressing the toothed ring onto the drive disk, it is heated to a temperature of 220–250°C. The toothed ring should be installed on the drive disk in repair shops at service stations.
Bolts (M12x1.5x28) tighten the drive disk fasteners crosswise with a torque of 120 N·m (12.0 kgf·m).
The automatic transmission torque converter is attached to the drive disk with four M10x17.5 bolts (4).
The permissible runout of the drive disk, when measured along the outer circumference, is no more than 0.20 mm.
The dual-mass flywheel installed on the power unit equipped with a manual transmission is similar in design to the flywheel used with the M54, M62 and M57 engines.
(The original article is located on «BMWman.ru»)