11 16 550 Removing and installing alternator bracket (B48, B46)

Special tools required: 

• 11 4 470
• 2 408 958
• 17 0 100

Recycling: 

Catch and dispose of drained coolant.

Observe country-specific waste disposal regulations.

Necessary preliminary tasks: 

• Remove DRIVE BELT FOR ALTERNATOR 
• Remove ALTERNATOR
• Drain COOLANT
• Remove HOLDER

Removal: 

Fig 1: Air Conditioning Compressor And Screws

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Release and remove screw (1) from air conditioning compressor (3).

Release screw (2) of air conditioning compressor (3).

Slightly tip engine backwards and remove screw (2).

Set the air conditioning compressor (3) to the side.

Release screw (1) on alternator bracket (2) from bottom.

Fig 2: Alternator Bracket And Screw

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Unlock connector (1) and pull off.

Release clamp (2) and pull off coolant hose (3).

Fig 3: Coolant Hose, Connector And Clamp

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Unlock coolant line (1) and pull off.

Fig 4: Coolant Line

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Release screws (1).

Remove alternator support (2).

Fig 5: Alternator Support And Screws

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Installation: 

Clean sealing surface (1) with special tool 11 4 470 .

Check centering bush (2) for damage and replace if necessary.

Fig 6: Centering Bush And Sealing Surface

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Check centering bush (1) for damage and replace if necessary.

Fig 7: Centering Bush

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Installation note: 

If the sealing bead (1) protrudes slightly and if the sealing bead (1) is not damaged, the alternator support can be reinstalled.

Fig 8: Sealing Bead

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If damaged: remove sealing bead (1) using suitable tool.

Replacing the sealing bead (1) SEALING COMPOUND 2.2  (Loctite 5970).

Sealant height approximately 2 to 2.5 mm.

Mount alternator support (2).

Tighten down screws (1).

Tightening torque 11 51 3AZ .

Fig 9: Alternator Support And Screws

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Connect coolant line (1).

Coolant line (1) must audibly engage.

Fig 10: Coolant Line

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Check internal tightness of the coolant thermostat: 

Mount special tool 2 408 958 on the coolant thermostat.

Connect the special tool 17 0 100 (17 0 102) to special tool 2 408 958 .

With special tool (hand pump) 17 0 100 (17 0 101), establish 0.5 bar pressure.

Fig 11: Mounting Special Tool (2 408 958) On Coolant Thermostat

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The pressure may fall to 0.1 bar.

It is internally tight, when the pressure is maintained at 0.1 bar.

If no pressure can be built up, then the coolant thermostat is leaking internally.

The coolant thermostat must be removed again and reinstalled.

Then repeat the operation.

Remove all special tools.

Mount coolant hose (3) and secure with clamp (2).

Connect the connector (1).

Fig 12: Coolant Hose, Connector And Clamp

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Attach screw (1) to alternator bracket (2).

Tightening torque 11 51 3AZ .

Fig 13: Alternator Bracket And Screw

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Position air conditioning compressor (3) at alternator bracket.

Insert and tighten screw (1).

Tightening torque 64 52 3AZ .

Slightly tip engine backwards and insert screw (2).

Tighten screw (2).

Tightening torque 64 52 3AZ .

Fig 14: Air Conditioning Compressor And Screws

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Required follow-up work: 

• Add COOLANT