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
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Removing And Installing / Replacing Master Brake Cylinder For DSC
Special tools required:
32 1 27032 1 270 PLUGS (SET)
Necessary preliminary tasks:
Remove expansion tank.
Read and comply with General Information.
After completing tasks, bleed brake system with DSC.
IMPORTANT: Do not bend brake lines.
Unfasten brake lines (2).
Unclip retaining bar (1) and r
Replacing A Guide Arm
NOTE: If the guide arm is detached from the rear axle carrier, it is
necessary after
reinstallation to carry out a wheel/chassis alignment check.
Necessary preliminary tasks:
Remove rear wheel.
Deactivate and empty air spring system.
Unscrew nut (1).
Remove guide arm (2) from wheel carrier.
In
