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Belt drive system

The belt drive has been adjusted for the higher engine speed. The belt pulley at the crankshaft has a smaller diameter. The drive belts have been modified accordingly.

The belt drive includes a main belt drive with alternator, coolant pump and power steering pump. The main belt drive is tensioned with a mechanical tensioning pulley.

The secondary belt drive includes the air conditioning compressor and is equipped with an elastic belt.

The following graphic shows the components that are involved in the belt drive.

Fig 1: Identifying Belt Drive System
G09908386Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Belt pulley alternator
2 Belt
3 Coolant pump belt pulley
4 Belt tensioner
5 Power steering pump belt pulley
6 Crankshaft belt pulley
7 Air conditioning compressor, belt pulley