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11 28 010 Replacing drive belt for alternator (N63)

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Special tools required: 

IMPORTANT: If contaminated with hydraulic fluid: Replace  drive belt.

Installation note: 

If the drive belt is to be reused, mark direction of travel and reinstall drive belt in same direction of rotation.

Necessary preliminary work: 

IMPORTANT: Belt tensioner is under high initial spring preload.

Slowly and carefully pre-tension belt tensioner (1) in direction of arrow up to stop.

Secure special tool 11 3 340 in dowel hole (2).

Belt tensioner in installation position.

Remove drive belt.

Fig 1: Turning Belt Tensioner
G09920816Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: On vehicles which do not have a power steering pump, a deflecting element (3) is fitted in place of the power steering pump.
IMPORTANT: Belt tensioner is under high initial spring preload.

Put on the drive belt.

Remove special tool 11 3 340 from dowel hole (2).

Slowly relieve tension on belt tensioner (1).

Installation note: 

Make sure drive belt is in correct installation position.

Fig 2: Turning Belt Tensioner
G09920817Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.