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12 31 020 Removing And Installing Or Replacing Alternator (N62)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

Switch off ignition.

Follow instructions for disconnecting and connecting battery.  See 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Disconnect and cover battery negative lead.

WARNING: Danger of scalding!
Only perform these tasks on an engine that has cooled down.

Remove radiator.  See 17 11 000 REMOVING AND INSTALLING RADIATOR (N62) .

Remove alternator drive belt.  See 11 28 010 REPLACING ALTERNATOR DRIVE BELT (N62/N62TU) .

Remove A/C compressor drive belt.  See 11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (N62) .

Release screws on antifriction bearing on left and right of stabilizer bar.

Hydraulic lines on oscillating motor remain connected. Do not release screws on stabilizer link. Remove stabilizer bar with antifriction bearing from threaded pins and secure against falling down.

Release holder from hydraulic lines for power steering.

Hydraulic lines on power steering pump remain connected.

NOTE: For purposes of clarity, the following work steps are shown on the engine after it has been removed.

Release screws and remove guide pulley (1).

Fig 1: Identifying Guide Pulley
G04777992Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Unscrew nut (2).

Remove battery positive lead from alternator (3).

Fig 2: Identifying Plug And Alternator
G04777993Courtesy of BMW OF NORTH AMERICA, INC.

Recycling 

A residual quantity of coolant emerges when the alternator is removed from the housing.

Catch and dispose of escaping coolant.

Observe country-specific waste-disposal regulations.

Release screws on alternator (3).

Fig 3: Identifying Alternator
G04777994Courtesy of BMW OF NORTH AMERICA, INC.

Pull out alternator towards front.

Installation: 

Replace sealing ring (1) on alternator.

Fig 4: Identifying Sealing Ring
G04773976Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: If necessary, replace alternator belt pulley.  See 12 31 ... REPLACING ALTERNATOR BELT PULLEY .

Top up coolant.  See 17 00 005 DRAINING AND ADDING COOLANT (N62) .

Vent cooling system and check for leaks.  See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (N62, N62TU) .

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