23 42 533 Replacing Hydraulic Unit GS6S53BZ SMG (Transmission Removed)

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

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"
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, 00 1 450) Into Transmission Mount

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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

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Release fitting screw (1).

Tightening torque 23 31 3AZ . See INTERIOR SHIFT COMPONENTS for specs.

Installation:

Replace fitting screw.

Fig 3: Identifying Fitting Screw

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Remove screws (1) and (2).

Tightening torque 23 41 1/7AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

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 Lines And Shift Actuator

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Unlock plug (1) and detach from holder.

Release screws (2).

Tightening torque 23 41 7AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

Fig 5: Identifying Plug Holder

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Unlock plug (1) and detach from holder.

Release screws (2).

Tightening torque 21 52 5AZ . See CLUTCH OPERATION (HYDRAULIC) for specs.

Fig 6: Locating Plug Holder

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Release screw (1).

Tightening torque 23 41 7AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

Installation:

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

Fig 7: Identifying Retainer And Screw

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Release screws (1) and (2).

Tightening torque 23 41 7AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

Fig 8: Identifying Hydraulic Unit Screws

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

Tightening torque 23 41 7AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

Tightening torque 23 41 8AZ . See EXTERNAL GEARSHIFT COMPONENTS for specs.

Remove hydraulic unit.

Fig 9: Identifying Hydraulic Unit Plate Screws

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