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.
![Engine Service Information](images/books/1905/index219(4).png)
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.
![Engine Service Information](images/books/1905/index220(4).png)
Fig. 12: Identifying Aluminum Bolt
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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
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
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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Electronic unlocking of the
transmission lock
General information
Electronically unlock the transmission lock to
maneuver vehicle from a hazardous area.
Before unlocking the transmission lock, set the
parking brake to prevent the vehicle from rolling
away.
In vehicles with Mild-Hybrid technology a
REMOVING AND INSTALLING/REPLACING OIL PRESSURE SENSOR (N52, N52K, N51,
N54, N53)
Necessary preliminary tasks:
Switch off ignition
N52, N52K, N51, N53 only:
Remove ignition coil cover.
N54 only:
Remove intake filter housing
WARNING: Scalding hazard!
Only perform this task on an engin