Removing and installing alternator bracket (B48 and B46 engine) (Cooper S and John Cooper Works)

Special tools required:

11 4 470
2 408 958
17 0 100

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

Recycling:

Catch and dispose of drained coolant.

Observe country-specific waste disposal regulations.

NOTE: The coolant thermostat is not available separately (see the appropriate BMW parts catalogue).
In case of a faulty coolant thermostat, the entire alternator bracket needs to be replaced.

Preliminary work needed:

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

Removal:

NOTE: Air conditioning does not have to be drawn off.
Do not damage radiator!

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.

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

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Unlock connector (1) and detach.

Release clamp (2) and detach coolant hose (3).

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Unlock coolant line (1) and detach.

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Unscrew the screws (1).

Remove alternator support (2).

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Installation:

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

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

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

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NOTE: Sealing bead (1) is bonded to housing of the new alternator support.

Installation note:

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

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

Replacing the sealing bead (1) SEALANT 2.2 (Loctite 5970).

Sealant height approximately 2 to 2.5 mm.

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Mount alternator support (2).

Tighten down screws (1).

Tightening torque 11 51 3AZ .

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Connect coolant line (1).

NOTE: Ensure correct locking of the coolant line (1).
Coolant line (1) must audibly engage.

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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.

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.

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

Connect the connector (1).

NOTE: Ensure correct cable routing in the marked area.

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

Tightening torque 11 51 3AZ .

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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 .

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Required follow-up work:

Install HOLDER .
Install ALTERNATOR .
Install DRIVE BELT FOR ALTERNATOR .
Add COOLANT .