27 10 010 Removing and installing transfer box (ATC 350)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required

IMPORTANT: Before and after replacement, execute the "Repair" service function with the BMW diagnosis system.

IMPORTANT: After completion of work, CHECK OIL LEVEL and top up if necessary.
Failure to comply with this requirement will result in serious damage to the transfer box!

Necessary preliminary tasks:

Disconnect BATTERY EARTH LEAD
Remove UNDERBODY PROTECTION
Remove COMPLETE EXHAUST SYSTEM
Remove heat shields
Disconnect PROPELLER SHAFT at gearbox, release center mount
Tie back propeller shaft to underbody

IMPORTANT:

An excessive deflection angle of the propeller shaft may damage the joint/propeller shaft!
Support gearbox with jack when removing the transfer box.

Release screws.

Tightening torque 26 11 7AZ .

Remove front propeller shaft at output flange of transfer box and tie to one side.

Installation note:

Replace screws.

Fig 1: Locating Front Propeller Shaft Output Flange Screws

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NOTE: Support transmission with special tools 00 2 030 , 23 4 050 .

Fig 2: Supporting Transmission Using Special Tools (00 2 030 And 23 4 050)

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Release screws (1).

Remove cooling air duct (2).

Fig 3: Identifying Cooling Air Duct And Screws

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Undo bolts (1) for gearbox mount.

Tightening torque 22 32 10AZ .

Fig 4: Identifying Gearbox Mounting Bolts

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Release screws.

Remove transmission cross member.

Tightening torque 22 32 3AZ .

Tightening torque 22 32 6AZ .

Fig 5: Locating Transmission Cross-Member Mounting Screws

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Disconnect connector (1) from transfer box control unit (linear force module) (2).

Fig 6: Identifying Transfer Box Control Unit And Connector

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Slightly lower gearbox.

Release screw connection of transfer box.

Tightening torque 27 10 1AZ .

Remove transfer box.

Installation note:

Pay attention to dowel pin (1).

Grease dowel pin (1).

Apply a thin coat of grease to gearing.

Grease: WEICON ANTI-SEIZE.

Fig 7: Identifying Dowel Pin

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