51 24 150 Removing And Installing/Replacing Hydraulic Unit For Rear Lid Actuation (ELECTROHYDRAULIC-Fully Automatic)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Read and comply with Notes on automatic rear lid actuation (electrohydraulic-fully automatic). See 51 24 ... NOTES AND INSTRUCTIONS ON AUTOMATIC REAR LID ACTUATION (FROM 02/2003) (ELECTROHYDRAULIC-FULLY AUTOMATIC) .
Remove right luggage compartment wheel arch trim . See 51 47 161 REMOVING AND INSTALLING / REPLACING RIGHT LUGGAGE COMPARTMENT WHEEL ARCH TRIM .

Have a cleaning cloth ready to catch emerging fluid.

Unscrew nuts (1).

Remove holder and pull out hydraulic unit (2).

Disconnect plug connections (3).

When removing of hydraulic cylinder only:

Unhook cable holders (5) and feed out hoses (4).

Tightening torque 51 24 4AZ. See BODY EQUIPMENT - TIGHTENING TORQUES -- ALPINA .

Tightening torque 51 24 7AZ. See BODY EQUIPMENT - TIGHTENING TORQUES -- ALPINA .

Fig 1: Identifying Plug Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Detaching hoses on hydraulic unit:

IMPORTANT: Catch emerging fluid with a cleaning cloth.

Release banjo bolts (1) and (2).

Installation:

Banjo bolt on hydraulic unit "RED"
Banjo bolt on hydraulic unit "BLUE"
Adhesive tape on hose is "red"
Adhesive tape on hose is "blue"

Fig 2: Identifying Banjo Bolt
Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 51 24 1AZ. See BODY EQUIPMENT - TIGHTENING TORQUES -- ALPINA .

NOTE: If the hydraulic unit (5) is replaced or stays removed for an extended period of time, seal the bores in the hydraulic unit and the hose connections for the hydraulic cylinder.

Sealing connections on hydraulic unit and hose connections for hydraulic cylinders:

Hydraulic unit:

Use seal plugs from "Small parts for hydraulic unit"* set and removed seals.

Hose connections:

Use seal plugs with cap nuts from "Small parts for hydraulic unit"* set and removed seals.

* Sourcing reference: BMW Parts Service

Installation:

Always fit new banjo bolts (1) and seals (2 and 4).

Hollow screw
Upper seal (thin)
Hose connection
Lower seal (thick)

Check fluid level in hydraulic unit

Fig 3: Identifying Banjo Bolts And Seals
Courtesy of BMW OF NORTH AMERICA, INC.

Replacement only:

If necessary, replace faulty mounts (1) for hydraulic unit (2).

Fig 4: Identifying Mounts And Hydraulic Unit

Courtesy of BMW OF NORTH AMERICA, INC.