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N55 Engine
Cylinder Head
The combination of exhaust turbocharger, Valvetronic, and direct fuel injection is referred
to as Turbo-Valvetronic-Direct-Injection (TVDI).
Cylinder Head Cover
Note: If a customer complains about high oil consumption and oil is
discovered in the turbocharger, it should not be immediately
assumed that the turbocharger is defective.
If the oil is present in the fresh air pipe after the introduction of the
blow-by gasses then the entire engine should be checked for leaks.
Defective gaskets or crankshaft seals may be the cause of excessively
high blow-by gas output.
Fuel Injectors
In order to remove the N55 fuel injectors from the cylinder head, special tool #13 0 270
must be utilized. Failure to use the special tool will result in damage to the injectors.
Note: Do not open the high pressure fuel injection system if the coolant
temperature is above 40°C . The residual pressure in the high pressure
fuel system could cause bodily injury.
Service Information
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