BMW X5: Bolts
Although, the N54 engine has an all aluminum crankcase, many of the bolts are still aluminum as on the N52.
This is to reduce any potential confusion between steel and aluminum bolts. Some bolts, for example, are steel such as the cylinder head cover bolts. This is possible, due to the plastic cylinder head cover.
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Fig. 11: Identifying Bolt
The N52KP and N51 engines use the same aluminum bolt configuration as the N52 engine, with little change.
The cylinder head cover bolts are like the N54 - steel, due to the plastic cylinder head cover.
The same rules apply to the handling of aluminum bolts as in the past.
Strict adherence to repair instructions is required to ensure proper connections.
Be sure to follow the proper torque/tightening angle sequence as outlined in the "tightening torques" section of TIS.
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Fig. 12: Identifying Aluminum Bolt
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Cylinder Head Cover
As stated before, the cylinder head cover used on all of the new NG6 engines
is made from plastic. However, the design differs between the engines due to
engine equipment.
For example, the N54 engi
Valvetrain
The valvetrain on the N52 introduced in 2006, used 5 mm valve stems on both
the intake and exhaust. To
increase durability, the exhaust valve stems were increased to 6 mm from 6/06
production.
All
Gaskets And Seals
Head Gasket
The head gasket design on the N54 is unique to that engine.
It features a multi-layer steel design. There is no silicone rubber perimeter
"shelf" as on the N52. This is not
needed due to
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Centre Console Assembly
REPLACING CENTRE MOUNT GAITER
Necessary prelim2222inary tasks:
Remove propeller shaft.
NOTE: The propeller shaft is balanced. The front and rear propeller
shafts must be
reassembled in the same position.
Detach gaiter (1) from groove (2).
Mark front propeller shaft (3) and rear propeller shaft (
Removing And Installing/Replacing Light Control Unit
Necessary preliminary tasks:
Remove left fresh-air grille.
Press out light control unit (1) from inside.
Fig. 175: Pressing Out Light Control Unit
Disconnect plug connection (1).
Remove light control unit.
Installation:
Make sure retainers (2) are correctly seated on trim of light control unit.
