12 31... Replacing alternator belt pulley

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Special tools required:

12 7 110

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

hexagon socket
multi-tooth socket or
Torx socket wrench

Release nut with special tool 12 7 110.

Installation:

For tightening torque refer to 2AZ / 3AZ in 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Fig 1: Identifying Special Tool (12 7 110)

G04740393

Courtesy of BMW OF NORTH AMERICA, INC.

Procedure with special tool 12 7 121:

NOTE:

Illustration shows N42 engine

If fitted, remove cover cap from belt pulley.

Depending on alternator type, slacken screw with:

Torx key
Hold inner multi-wrench tool (special tool 12 7 122).

Release freewheel with special tool 12 7 121 and remove.

Installation note:

For tightening torque refer to 8AZ in 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Fig 1: Identifying Special Tool (12 7 121) And (12 7 122)

G04751318

Courtesy of BMW OF NORTH AMERICA, INC.

Procedure with special tool 12 7 123:

Depending on alternator type, slacken screw with:

Torx key
Hold inner multi-wrench tool (special tool 12 7 122).

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

Installation note:

For tightening torque refer to 8AZ in 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Fig 2: Identifying Special Tool (12 7 123)

G00526767

Courtesy of BMW OF NORTH AMERICA, INC.