11 66 000 Removing and installing/replacing vacuum pump (N55) - from March 2012

Special tools required: 

• 11 0 290
• 11 4 120
• 11 8 650

Necessary preliminary tasks: 

• Remove DRIVE BELT .
• Remove TENSIONER for drive belt.
• Remove SEALING COVER for vacuum pump.
• Remove SEALING CAP of chain tensioner for oil pump.
• Remove HIGH PRESSURE PUMP .
• Disconnect vacuum line from vacuum pump.

Unlock connector (1) on vacuum pump and disconnect.

Fig 1: Identifying Vacuum Pump Connector

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Rotate crankshaft at central bolt.

Turn sprocket wheel until drilled holes and screws of vacuum pump match up.

Screw in special tool 11 8 650 .

Secure special tool 11 0 290 in sprocket and to special tool 11 8 650 .

Release screw (1).

Tightening torque 11 66 2AZ .

Fig 2: Releasing Sprocket Screw

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Carefully press tensioning rail (1) with a suitable screwdriver (2) in direction of arrow.

As the oil pressure in the chain tensioner can only be drained pulsating, the tensioning rail (1) must be pressed several times.

Fig 3: Pressing Tensioning Rail

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Press the tensioning rail (1) and hold down.

Fix chain tensioner piston in position with a suitable lock pin (2).

Fig 4: Securing Chain Tensioner Using Lock Pin

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Release screws (1).

Tightening torque 11 66 1AZ .

Release screws (1).

Secure screws (1) against falling out.

Fig 5: Identifying Screws

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Remove vacuum pump (1) in direction of arrow.

Installation note: 

Replace seal. 

Fig 6: Removing Vacuum Pump

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Assemble engine.