Removing and installing/replacing vacuum pump (S55 engine)

Special tools required: 

• 11 0 290
• 11 4 120
• 11 8 650

Necessary preliminary work: 

• Remove DRIVE BELT .
• Remove TENSIONER  for drive belt.
• Remove SEALING COVER  for vacuum pump.
• Remove high pressure pump. Refer to REMOVING AND INSTALLING/REPLACING FRONT HIGH PRESSURE PUMP and REMOVING AND INSTALLING/REPLACING REAR HIGH PRESSURE PUMP .

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).

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Attention! 

Before removing the central bolt, the hydraulic chain tensioner must be drained.

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.

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Press chain tensioner with drive chain (1) in direction of arrow.

Insert special tool 11 4 120.

Remove special tool 11 0 290.

Remove camshaft sprocket (2) in direction of arrow.

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Release screws (1).

Secure screws (1) against falling out.

Remove vacuum pump towards rear.

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Installation: 

Install vacuum pump.

Installation note: 

Replace gasket  .

Position camshaft sprocket on the vacuum pump.

Join screws (1).

Tightening torque 11 66 1AZ .

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

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

Release screw (1).

Tightening torque 11 66 2AZ .

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Remove all special tools.

Assemble engine.