51 24 150 Removing And Installing/Replacing Hydraulic Unit For Rear Lid Actuation (From 02/2003) (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:

Have a cleaning cloth and an oil drip tray ready to catch emerging fluid.
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 .

Unscrew nuts (1).

Remove holder and pull out hydraulic unit (2).

Disconnect plug connections (3).

When removing 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 And Holder

Courtesy of BMW OF NORTH AMERICA, INC.

When removing hydraulic unit only:

Detaching hoses on hydraulic unit:

IMPORTANT: Catch escaping fluid with a cleaning cloth/oil drip tray.

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 . See 51 24 660 CORRECTING FLUID LEVEL IN HYDRAULIC UNIT (FROM 02/2003) FOR REAR LID ACTUATION (ELECTROHYDRAULIC-FULLY AUTOMATIC) .

Fig 3: Identifying Banjo Bolts And Seals

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Insert guide (1) into counter support (2).

If necessary, replace counter support (2).

Fig 4: Identifying Guide And Counter Support

Courtesy of BMW OF NORTH AMERICA, INC.