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:
Replacing Complete Rear Left Wheel Arch (Rear Left Side Panel
Removed)
Read contents of Body, General.
Spot-weld bonding is used on this vehicle. Observe specific procedure.
Remove or cover those vehicle components in the repair area which are
susceptible to heat or dust.
Use only approved spot-welding apparatus for repairs!
Place vehicle on straightening bench.
F
Fuel System Testing
Fuel systems need to be checked for proper fuel pressure as well as
sufficient volume. When diagnosing fuel
system complaints, you must take into account the type of fuel system and how
the fuel is delivered to the
engine.
Malfunctions in the fuel system can cause driveability complaints which in
