BMW X5: Crankcase
As far as the physical appearance and dimensions, the crankcase on the N54 is the same as the N52. The main change is in the materials, the N54 uses an all aluminum alloy crankcase. There is also cast iron cylinder liners similar to the previous M54 engine.
The reason for using the all aluminum configuration is to be more compatible with the increased torque output and cylinder pressure in the N54.
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Fig. 8: Identifying Aluminum Alloy Crankcase
The N54 engine continues to use the "two-piece" crankcase featuring the "bedplate" design.
The N52KP and N51 engines continue to use the composite magnesium/aluminum alloy engine from the existing N52.
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Fig. 9: Identifying "Two-Piece" Crankcase
NOTE: The N54 engine has a different bolt pattern on the transmission mounting (bellhousing) area.
Therefore, a new special tool is needed to mount the engine to an engine stand.
The new tool has slots which will accommodate all NG6 engines.
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Fig. 10: Identifying Bolt Pattern On Transmission Mounting
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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, fo
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
SEE MORE:
Vehicle tool kit
The onboard vehicle tool kit is located under the
cargo floor panel.
Wiper blades
Safety information
NOTICE
The window may sustain damage if the wiper
falls onto it without the wiper blade installed.
There is a risk of damage to property, among
other potential damage. Hold the wiper firmly
when ch
Removing And Installing / Replacing Control Unit For Transfer Box (ATC
700)
IMPORTANT: Read and comply with notes on protection against
electrostatic damage (ESD
protection).
Replacement:
Before and after replacement, execute the "Repair" service function with
the BMW diagnosis system.
Necessary preliminary tasks:
Raise luggage compartment floor trim
Release screws
