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12 31 020 Removing and installing or replacing alternator (N62)

WARNING: This page is about a different car, the 2005 BMW 545i and 2004 BMW 545i. 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. Refer to 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.

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

Remove A/C compressor drive belt. Refer to 11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT WITH BELT TENSIONER (N62/N62TU) .

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 Retaining Screws
G03270226Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Unscrew nut (2).

Remove battery positive lead from alternator (3).

Fig 2: View Of Battery Positive Lead On Alternator
G03270227Courtesy 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: Releasing Screws On Alternator
G03270228Courtesy of BMW OF NORTH AMERICA, INC.

Pull out alternator towards front.

Installation: 

Replace sealing ring (1) on alternator.

Fig 4: Replacing Sealing Ring On Alternator
G03270229Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: If necessary, replace alternator belt pulley. Refer to 12 31 ... REPLACING ALTERNATOR BELT PULLEY 

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

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

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