BMW X5 Owners & Service Manuals

BMW X5: Alternator With Drive

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
Fig. 30: 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:

Tighten to specified torque.

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
Fig. 31: Wave Form Graph - Fault-Free Alternator

Oscillogram for a faulty alternator:

One phase interrupted.

Repair/exchange alternator.

Alternator With Drive
Fig. 32: Wave Form Graph - One Phase Interrupted

Interturn fault.

Repair/exchange alternator.

Alternator With Drive
Fig. 33: Wave Form Graph - Interturn Fault

Open circuit in negative diode.

Repair/exchange alternator.

Alternator With Drive
Fig. 34: Wave Form Graph - Open Circuit In Negative Diode

Short circuit in positive diode.

Repair/exchange alternator.

Alternator With Drive
Fig. 35: Wave Form Graph - Short Circuit In Positive Diode

Open circuit in positive diode.

Repair/exchange alternator.

Alternator With Drive
Fig. 36: Wave Form Graph - Open Circuit In Positive Diode

Open circuit in exciter diode.

Repair/exchange alternator.

Alternator With Drive
Fig. 37: Wave Form Graph - Open Circuit In Exciter Diode

Assemble engine.

Check function of DME/DDE.

REMOVING AND INSTALLING OR REPLACING ALTERNATOR (N52K)

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.

The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Unlock plug (1) and remove.

Slacken nut (2).

Installation:

Tightening torque 12 31 1AZ.

Release screws and remove alternator (3).

Alternator With Drive
Fig. 38: Identifying Alternator Plug And Nut

Installation:

Replace aluminum screws.

Tightening torque 12 31 1AZ.

Alternator With Drive
Fig. 39: Identifying Alternator Guide Pulley

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