Vibration Damper

A single-mass vibration damper is used on the N55 engine. The belt pulley is mounted on the secondary pulley. Compared to the N54 engine, this design layout additionally reduces the belt load as the vulcanization decouples the belt pulley with flywheel mass from the crankshaft.

Fig 1: Identifying Vibration Damper Components - N54

Courtesy of BMW OF NORTH AMERICA, INC.

INDEX EXPLANATION CHART

Index	Explanation
A	Vibration damper, N55 engine
B	Vibration damper, N54 engine
1	Crankshaft
2	Bolts
3	Primary pulley
4	Vulcanization
5	Secondary belt pulley with flywheel mass
6	Primary belt pulley
7	Flywheel mass

Fig 2: Identifying Vibration Damper Components - N55

Courtesy of BMW OF NORTH AMERICA, INC.

INDEX EXPLANATION CHART

Index	Explanation
1	Secondary belt pulley with flywheel mass
2	Flange
3	Vulcanization