54 34 005 Removing and installing/replacing hydraulic unit for convertible top drive unit (Z3 Roadster, M Roadster)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2002 BMW Z3, 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW Z3, and 2001 BMW M Roadster. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Observe notes on EH convertible top. Refer to 54 34... NOTES ON EH CONVERTIBLE TOP (Z3 ROADSTER, M ROADSTER) .

Necessary Preliminary Tasks:

Remove luggage compartment trim on left. Refer to 51 47 151 REMOVING AND INSTALLING/REPLACING LEFT TRUNK WHEEL HOUSING TRIM (Z3 ROADSTER, M ROADSTER) .
Open emergency valve (system is depressurized). Refer to 54 34... NOTES ON EH CONVERTIBLE TOP (Z3 ROADSTER, M ROADSTER) .
Lay an absorbent protective cover on the trunk floor next to the hydraulic control unit (danger of becoming dirty from oil running out).

NOTE: There are 2 different hydraulic units. The unit illustrated is the newer one. It was introduced at the beginning of 1999. In the event of replacement, this new unit can be installed.

Components:

Plug.
Nut for cable (tightening torque: 11 Nm.).
Cable.
Nut for mounting bracket (tightening torque: 11 Nm.).
Hydraulic unit with marking for fluid level.
Relay with holder.
Emergency valve.
Oil filler plug (tightening torque: 11 Nm.).

Fig 1: Identifying Hydraulic Unit Components

G03179196

Courtesy of BMW OF NORTH AMERICA, INC.

As Both Hydraulic Units Are Very Similar, The Following Text Describes Removal Of The Older Unit:

Disconnect plug (1).
Release nut (2) and detach cable (3).
Release nut (4).
Unscrew hydraulic unit (5) inwards and set down on protective cover.

Installation:

Tightening torque: 11 Nm.

Fig 2: Removing Procedure Hydraulic Units

G03179197

Courtesy of BMW OF NORTH AMERICA, INC.

Press down lock (1) and detach relay holder (2).

Fig 3: Pressing Down Lock

G03179198

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Have a cloth ready to wipe away escaping oil.

If necessary, press relay holder to one side slightly.

Release banjo bolts (1) and (2) and remove lines.

Fig 4: Releasing Banjo Bolts

G03179199

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Hose with red hose lettering (3) on hydraulic unit connection "red".
Hose with blue hose lettering (4) on hydraulic unit connection "blue".
Tightening torque: 11 Nm.

NOTE: If hydraulic components are to be stored for an extended period, seal off bores on hydraulic unit and hose connections for hydraulic cylinder.

Installation:

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

Fig 5: Fitting New Banjo Bolts And Seals

G03179200

Courtesy of BMW OF NORTH AMERICA, INC.

Banjo bolts (1) on hydraulic unit have a nozzle.

Banjo bolt.
Upper seal (thin).
Hose connection.
Lower seal (thick).

Important!

Check fluid level, top up if necessary. Refer to 54 34... NOTES ON EH CONVERTIBLE TOP (Z3 ROADSTER, M ROADSTER) .

Seal Off Lines And Line Connections:

Plug Connections On Hydraulic Control Unit:

Use the plugs (1) from the "Banjo bolts for hydraulic unit" set and the old seals for this purpose.

Fig 6: Locating Plug Banjo Bolts

G03179201

Courtesy of BMW OF NORTH AMERICA, INC.

Plug hose connections for hydraulic cylinder:

Use the plugs (1) and cap nuts (2) from the "Banjo bolts for hydraulic unit" set and the old seals for this purpose.

Fig 7: Identifying Plug And Cap Banjo Bolts

G03179202

Courtesy of BMW OF NORTH AMERICA, INC.