12 31 020 Removing and Installing or Replacing Alternator (N54)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 BMW 335xi, 2010 BMW 335i, 2009 BMW 335xi, 2009 BMW 335i, and 2008 BMW 335xi. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Switch off ignition
- Disconnect battery negative lead and cover (See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD and/or 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD )
- Remove charge-air duct
- Remove alternator drive belt
NOTE:
In order to remove the alternator, it is necessary to remove
the A/C compressor.
In so doing:
- Do not draw off A/C system refrigerant.
- Do not detach refrigerant lines from compressor.
- Do not remove compressor; instead, remove from bracket only and place to one side.
Remove compressor from bracket.
NOTE:
For purposes of improved clarity, illustrations and description show compressor removed.
Release bolts a few turns until bracket (1) is loose. Do not remove bracket (1).
Tightening torque 64 52 5AZ. See HEATING AND AIR CONDITIONING - TIGHTENING TORQUES - COUPE or HEATING AND AIR CONDITIONING - TIGHTENING TORQUES - SEDAN .
Unlock plug (1) and remove.
Remove protective cap and release nut underneath.
Tightening torque 12 42 1AZ, see ENGINE ELECTRICAL SYSTEM -- TORQUE SPECIFICATIONS -- TWIN TURBO
Disconnect line (2).
Unfasten screws.
Remove bracket (1) and alternator (2).
Tightening torque 12 31 1AZ, see ENGINE ELECTRICAL SYSTEM -- TORQUE SPECIFICATIONS -- TWIN TURBO .