12 31 020 Removing And Installing/Replacing Alternator (Liquid-Cooled N73)

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NOTE:

For Special Tool identification, see ENGINE ELECTRICAL SYSTEM - SPECIAL TOOLS .

Special Tools Required:

12 7 110

WARNING: Danger of scalding! Only carry out work on cooling system after engine has cooled down.

Necessary Preliminary Tasks:

Follow instructions for disconnecting and connecting battery. Refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Disconnect battery negative lead from battery and lay to one side. Refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Remove complete left intake filter housing. Refer to 13 71 010 REMOVING AND INSTALLING/REPLACING LEFT (OR RIGHT) INTAKE FILTER HOUSING (N73) .
Remove radiator. Refer to 17 11 000 REMOVING AND INSTALLING RADIATOR (N73) .
Remove alternator drive belt. Refer to 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N73) .

Detach water hose (1) from water pump.

NOTE: Illustrations show N62.

Fig 1: View Of Water Hose From Water Pump

Courtesy of BMW OF NORTH AMERICA, INC.

Detach water hose (1) from outer jacket for alternator.

Fig 2: Detaching Water Hose From Outer Jacket For Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Detach plug (1) from alternator.

Release nut (2).

Tightening torque, refer to 12 31 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Disconnect battery positive lead (3).

Fig 3: Detaching Plug From Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

CAUTION: Fully remove screw (1) at the end only. Release screws on alternator. Remove screw (1) half-way. Pull out alternator a little and allow coolant to drain off. Remove screw (1) completely. Pull alternator completely out of outer jacket and removed towards top.

Fig 4: Identifying Alternator

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing ring (1).

Fig 5: Locating Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Replace alternator pulley.

Release nut with special tool 12 7 110, gripping alternator shaft with hexagon socket screw wrench or multi-tooth socket wrench.

Tightening torque, refer to 12 31 3AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Fig 6: Identifying Special Tool (12 7 110)

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check for correct alternator operation.