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

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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