51 24 660 Correcting Fluid Level In 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.

CAUTION: Do not under any circumstance remove fluid tank from hydraulic unit.
Use fluid from "Small parts for hydraulic unit" set.

NOTE: Hydraulic unit removed.

Follow notes and instructions for automatic rear lid actuation (electrohydraulic-fully automatic). See 51 24 ... NOTES AND INSTRUCTIONS ON AUTOMATIC REAR LID ACTUATION (FROM 02/2003) (ELECTROHYDRAULIC-FULLY AUTOMATIC) .

Ideal filling:

Set hydraulic unit (1) down on a horizontal surface (4).

Damper (3) and valve (5) must not rest on surface.

Check distance (B) from middle of marking (2) to lower edge of hydraulic unit (1).

B = 45±1 mm

After correction, fluid level (2) must be in upper area (A) of marking (2).

Fig 1: Identifying Hydraulic Unit, Damper And Valve

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Correcting fluid level:

Release screws (1).

Detach electric motor (2) with drive flange (3) from pump carrier (4).

Installation:

Tightening torque, 51 24 3AZ. See BODY EQUIPMENT - TIGHTENING TORQUES -- ALPINA .

Fig 2: Identifying Electric Motor With Drive Flange

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing ring (1) on drive flange (2).

Fig 3: Identifying Sealing Ring On Drive Flange

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NOTE: Hydraulic fluid (4) seeps into fluid tank (6) through two bores under deep-groove ball bearing (2).

Fill hydraulic fluid (4) between cylinder star (5) and deep-groove ball bearing (2).

Lift pump carrier (3) several times at valve (1), air escapes from fluid tank (6) more quickly.

Fig 4: Identifying Cylinder Star And Deep-Groove Ball Bearing

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Set pump carrier (1) down on a horizontal surface (3).

Damper (4) and valve (2) must not rest on surface.

Fluid level (2) must be in upper area (A) of marking (5), correct if necessary.

Fig 5: Identifying Damper And Valve

Courtesy of BMW OF NORTH AMERICA, INC.

When ideal filling is achieved:

Connect hydraulic unit in vehicle to hydraulic hoses.

Close rear lid (motor-driven) twice and open again, this bleeds the system.

Hold hydraulic unit with drive (1) all round vertically upwards.

Fluid level (2) must be in area (A) of marking (3) with rear lid fully open (cylinder retracted).

Fig 6: Identifying Hydraulic Unit With Drive

Courtesy of BMW OF NORTH AMERICA, INC.