BMW X5 Owners & Service Manuals

BMW X5: Alternator With Drive And Mount

REPLACING ALTERNATOR BELT PULLEY

Special tools required:

Remove and install alternator drive belt.

Depending on alternator type, grip shaft with:

Release nut with special tool 12 7 110.

Installation:

Tightening torque, 12 31 2AZ / 12 31 3AZ.

Alternator With Drive And Mount
Fig. 37: Identifying Special Tool 12 7 110

REPLACING ALTERNATOR BELT PULLEY (WITH OVERRUNNING CLUTCH)

Special tools required:

Remove and install alternator drive belt.

Grip alternator shaft with:

Release nut with special tools 12 7 120.

Installation:

Tightening torque: 12 31 3AZ.

Alternator With Drive And Mount
Fig. 38: Special Tools (12 7 122) And (12 7 121)

CHECKING ALTERNATOR (BSD)

Necessary preliminary tasks:

NOTE: The alternator with BSD interface can communicate with the engine control unit (DME/DDE).

The alternator is not connected to the charge telltale light.

The alternator can identify various faults.

BSD alternator can be recognized by the plug connection on the alternator.

Connect diagnosis tester.

Oscillogram for a fault-free alternator:

Alternator With Drive And Mount
Fig. 39: Identifying Waveform - Fault-Free Alternator

Oscillogram for a faulty alternator:

One phase interrupted.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 40: Identifying Waveform - Faulty Alternator (1 Of 6)

Interturn fault.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 41: Identifying Waveform - Faulty Alternator (2 Of 6)

Open circuit in negative diode.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 42: Identifying Waveform - Faulty Alternator (3 Of 6)

Short circuit in positive diode.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 43: Identifying Waveform - Faulty Alternator (4 Of 6)

Open circuit in positive diode.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 44: Identifying Waveform - Faulty Alternator (5 Of 6)

Open circuit in exciter diode.

Repair/exchange alternator.

Alternator With Drive And Mount
Fig. 45: Identifying Waveform - Faulty Alternator (6 Of 6)

Assemble engine.

Check function of DME/DDE.

REMOVING AND INSTALLING/REPLACING ALTERNATOR (N62)

Necessary preliminary tasks:

Disconnect plug (3) from alternator.

Unscrew nut (1).

Lay B+ line (2) to one side.

Alternator With Drive And Mount
Fig. 46: Identifying Plug And Nut

Release screws (1).

Remove alternator (2).

Installation:

Modify guide pulley (3) to new alternator (replace if necessary).

Alternator With Drive And Mount
Fig. 47: Identifying Alternator, Guide Pulley And Screws

Check DME (alternator) for correct operation.

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