32 41 009 Checking function of power steering vane pump

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Special tools required:

32 4 000 FIXTURE

IMPORTANT: Prior to this check, first check all hose connections, the vane pump and the power steering gear for leaks.
Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.

Necessary preliminary tasks:

Draw off and dispose off hydraulic fluid from fluid reservoir
If necessary, remove front assembly underside protection, see 51 47 490 REMOVING AND INSTALLING / REPLACING FRONT UNDERBODY PROTECTION .
Disconnect pressure line from vane pump, see 32 41 060 Removing and installing/replacing power steering vane pump (N52) .

Connecting special tool:

Connect special tool 32 4 000 (refer to 32 41... Instructions for using special tool 32 4 000 ) with new sealing rings to vane pump and pressure line.

Connection, vane pump
Connection, power steering gear

Fig 1: Special Tool (32 4 000) And Connections

Courtesy of BMW OF NORTH AMERICA, INC.

Checking pump pressure:

Close valve (A).
Open valve (B).
Fill and bleed hydraulic system, see 32 13 006 Bleeding power steering unit .
Start engine.
Heat hydraulic fluid to approx. 50°C by moving steering wheel at increased engine speed.
Close valve (B) for max. 10 secs. and read off pressure.
Compare measured pressure with specified nominal pressure.

Replace vane pump if the nominal pressure is exceeded by more than 10 %, see 32 41 060 Removing and installing/replacing power steering vane pump (N52)

Fig 2: Special Tool (32 4 000) And Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Check belt tension if the nominal pressure is undershot by more than 10 %. Replace vane pump if belt tension is OK, see 32 41 060 Removing and installing/replacing power steering vane pump (N52)

After installation:

Fill and bleed hydraulic system, see 32 13 006 Bleeding power steering unit .
Check pipe connections for leaks