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
SEE MORE:
Cross Member
Minimum set: Mechanical tools
Note: To hold the engine when removing and installing the front axle support,
the oil sump and the transmission
Engine: M10, M20, M20B25, M20B27, M21, M30, M30B34, M30Tur, M40, M41, M42,
M43, M43TU, M44,
M47, M47T2, M47TU, M50, M51, M52, M52TU, M54, M56, M57, M57D25,
Navigation Systems
NOTES ON HANDLING NAVIGATION COMPUTERS
All model series:
CAUTION: Risk of damage!
The navigation computer must not be disconnected from the power supply
while the LED on the computer remains lit (the LED goes out after approx.
1 minute).
NOTE: To ensure full operation of all the communications comp
