Removing and installing/replacing hydraulic valve (S55 engine)

Necessary preliminary tasks: 

• Remove FRONT AIR DUCT .
• Remove right-hand INTAKE SILENCER HOUSING .
• Remove COOLANT PUMP .
• Have a cleaning cloth ready to catch escaping oil

Detach connector (1) from hydraulic valve (2).

Illustration shows N55

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Release screw (1) and remove hydraulic valve.

Tightening torque: 11 41 4AZ .

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Replace O-ring (1).

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Assemble engine.

Check function of Digital Engine Electronics.

CHECK ENGINE OIL PRESSURE .

Diagnosis path:

• DME Digital Motor Electronics
• Complete vehicle
• Power train
• Engine electronics
• Engine oil
• Oil-pressure control