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12 31 020 Removing and installing/replacing alternator (S54)

WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Switch off ignition.

Follow instructions for disconnecting and connecting battery. Refer to 12 00... Disconnecting and connecting battery  .

Disconnect and cover battery negative lead.

CAUTION: When working on the oil, coolant or fuel circuit, it is essential to protect the alternator against contamination. Cover alternator with suitable materials.

Failure to comply with this procedure may result in an alternator malfunction.

Remove fan cowl.

Remove alternator drive belt. Refer to 11 28 010 REPLACING ALTERNATOR DRIVE BELT (S54) .

NOTE: Drain the main flow oil filter in order to prevent an excessive discharge of oil when the oil cooler lines are disconnected.

This operation is described in the section "BMW engine oil service incl. supplementary service".

Release screw on holder for oil cooler lines (1).

Fig 1: Releasing Screw On Holder For Oil Cooler Lines
G03191022Courtesy of BMW OF NORTH AMERICA, INC.
CAUTION: Have a cleaning cloth ready. A small quantity of oil will emerge after the oil lines have been disconnected.
Make sure no oil runs onto the alternator. Remove any remnants of oil immediately with cleaning cloth.

Release screw.

Fig 2: Detaching Oil Lines From Main Flow Oil Filter Housing
G03191023Courtesy of BMW OF NORTH AMERICA, INC.

Detach oil lines from main flow oil filter housing.

Lay oil lines to one side to open up access to screw connection of battery positive lead on alternator.

Installation  :

Replace O-rings.

Release nut (1).

Installation  :

Tightening torque, 12 31 1AZ. Refer to 12 31 ALTERNATOR WITH DRIVE AND MOUNTING PARTS .

Remove battery positive lead from alternator.

Unlock plug (2) and detach from alternator.

Fig 3: Removing Components From Alternator
G03191024Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Lift off protective cap of screw (2) of tensioning roller.

Release screw (2) and pull out together with tensioning roller.

Remove alternator.

Fig 4: Removing Alternator
G03191025Courtesy of BMW OF NORTH AMERICA, INC.

Installation  :

Turning lock of tensioning roller must snap into place in groove.

Fig 5: Locating Turning Lock Of Tensioning Roller
G03191026Courtesy of BMW OF NORTH AMERICA, INC.
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