12 31 020 Removing and installing or replacing alternator (S65)

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks

Switch off ignition
Follow INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY
DISCONNECT BATTERY NEGATIVE LEAD and cover
Remove AIR FILTER HOUSING
REMOVE UNDERBODY PROTECTION
Remove ALTERNATOR DRIVE BELT

Release screws.

Unclip hoses from hose holders on radiator.

Carefully press leads (1) to one side.

Fig 1: Pressing Leads

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Release screws.

Pull alternator (1) forwards until connections are accessible.

Fig 2: Pulling Alternator Forward

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Unlock plug (1) and remove.

Release nut (2), remove battery positive lead from alternator.

Tightening torque 12 31 1AZ .

Pull alternator (3) upwards to remove.

Add final details to vehicle.

Read fault memory.

Fig 3: Removing Nut Using Special Tool (12 7 110)

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