11 28 010 Replacing Alternator Drive Belt (N51)

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:

For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .

11 3 340

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:

Remove fan cowl.
Mark the direction of rotation of the drive belt if it is to be reused.

Layout of drive belt.

Fig 1: Drive Belt Layout

Courtesy of BMW OF NORTH AMERICA, INC.

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

Hold belt tensioner (4) under tension.

Fig 2: Identifying Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Secure belt tensioner with special tool 11 3 340. See Fig 3.

NOTE: Illustration N42.

Fig 3: Securing Belt Tensioner With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

Remove drive belt (1) towards top.

Fig 4: Removing Drive Belt Towards Top

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation:

Check that drive belt for is in correct installation position - risk of damage .