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Home >> BMW >> 2009 >> 135i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Engine - Repair (N52K)) >> V-Ribbed Belt With TENSIONER Deflection Element >> 11 28 010 Replacing Alternator Drive Belt (N52K)

11 28 010 Replacing Alternator Drive Belt (N52K)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required: 

IMPORTANT: Aluminum-magnesium materials. No  steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. Aluminum screws/bolts must be replaced each time they are released.  Aluminum screws/bolts are permitted with and without color coding (blue). For reliable identification: Aluminum screws/bolts are not magnetic  . Jointing torque and angle of rotation must be observed without fail (risk of damage)  .

Necessary preliminary tasks: 

Drive belt routing E90, E91, E92, E93, E81, E82, E88 

NOTE: Mark the direction of rotation of the drive belt if it is to be reused.

Turn belt tensioner (4) in direction of arrow until bore (2) is flush on housing.

Hold belt tensioner (4) under tension.

Load is removed from tensioning pulley.

Fig 1: Turning Belt Tensioner
G05777348Courtesy of BMW OF NORTH AMERICA, INC.

Course of E85 drive belt: 

Turn belt tensioner (1) in direction of arrow until bore is flush on housing.

Hold belt tensioner (1) under tension.

Load is removed from tensioning pulley (2).

Fig 2: Turning Belt Tensioner
G04751148Courtesy of BMW OF NORTH AMERICA, INC.

All: 

Secure belt tensioner (1) with special tool 11 3 340. 

Remove drive belt upwards.

Fig 3: Identifying Belt Tensioner With Special Tool (11 3 340)
G04751149Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation: 

Check drive belt for correct installation position and, if reusing, observe direction of rotation. Risk of damage. 

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