23 42 533 Replacing hydraulic unit GS6S53BZ SMG (transmission removed)

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 1 450 . See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .
23 0 170 . See MANUAL TRANSMISSION - SPECIAL TOOLS .

IMPORTANT: Before working on hydraulic system:

Reduce pressure in hydraulic system by means of Service Function in DIS Tester
Disconnect hydraulic pump relay in electronics box.
Do not reconnect relay for entire duration of repair work.

NOTE: After completing work:

Check fluid level in hydraulic system by means of DIS Tester "Service Function". See 21 53... CHECKING/TOPPING UP FLUID LEVEL IN HYDRAULIC SYSTEM (GS6S37BZ/GS6S53BZ/ SMG) .
Perform "Teach in transmission" service function by means of DIS Tester

Mount transmission (1) with special tool 23 0 170 in assembly stand 00 1 450 .

Fig 1: Identifying Special Tool (23 0 170)

G04748929

Courtesy of BMW OF NORTH AMERICA, INC.

Remove sealing cap (1) using a screwdriver (2).

Service opening must not be damaged. Burr can cause the sealing cap to leak.

Installation:

Replace sealing cap.

Fig 2: Removing Sealing Cap Using Screwdriver

G04759317

Courtesy of BMW OF NORTH AMERICA, INC.

Release fitting screw (1).

Tightening torque 23 31 3AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Installation:

Replace fitting screw.

Fig 3: Identifying Fitting Screw

G04759318

Courtesy of BMW OF NORTH AMERICA, INC.

Remove screws (1) and (2).

Tightening torque 23 41 1/7AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Pull out shift actuator (4)

Do not detach hydraulic line (3).

Installation:

Clean sealing surfaces.

Apply Loctite 574 sealing compound to sealing faces.

Fig 4: Identifying Hydraulic Line (3), Shift Actuator (4) And Screws (1, 2)

G04759319

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and detach from holder.

Release screws (2).

Tightening torque 23 41 7AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Fig 5: Identifying Plug (1) And Screws (2)

G04759326

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and detach from holder.

Release screws (2).

Tightening torque 21 52 5AZ . See CLUTCH - TIGHTENING TORQUE .

Fig 6: Unlock Plug (1) And Detach From Holder; Release Screws (2)

G04759327

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque 23 41 7AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Installation:

Make sure retainer (2) for heat shield is correctly positioned.

Fig 7: Identifying Heat Shield Retainer (2) And Screw (1)

G04759328

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) and (2).

Tightening torque 23 41 7AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Fig 8: Identifying Screws

G04759329

Courtesy of BMW OF NORTH AMERICA, INC.

Release M8 screws (1) and M6 screws (2).

Tightening torque 23 41 7AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Tightening torque 23 41 8AZ . See MANUAL TRANSMISSION - TIGHTENING TORQUES .

Remove hydraulic unit.

Fig 9: Identifying M8 Screws (1) And M6 Screws (2)

G04759330

Courtesy of BMW OF NORTH AMERICA, INC.