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Home >> BMW >> 2009 >> 135i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 978 (Engine Electrical System - Repair (N52)) >> Alternator With Drive And Mount >> 12 31... Replacing Alternator Belt Pulley >> Special Tools Required

Special Tools Required

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.

Remove drive belt.

Illustrations show N42:

Procedure with special tool 12 7 121. 

If fitted, remove protective cap from belt pulley.

Depending on the alternator version, hold down alternator axis with:

Release freewheel with special tool 12 7 121  and remove.

Installation: 

Tightening torque, see 12 31 8AZ in ALTERNATOR WITH DRIVE AND MOUNT .

Fig 1: Identifying Special Tool (12 7 121 & 12 7 122)
G04751318Courtesy of BMW OF NORTH AMERICA, INC.

Procedure with special tool 12 7 123. 

Depending on the alternator version, hold down alternator axis with:

Release freewheel with special tool 12 7 123 and a ring spanner and remove.

Installation: 

Tightening torque, see 12 31 8AZ in ALTERNATOR WITH DRIVE AND MOUNT .

Fig 2: Identifying Special Tool (12 7 123)
G00526767Courtesy of BMW OF NORTH AMERICA, INC.