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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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
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
SEE MORE:
Special tools required:
12 1 080
12 1 081
12 1 083
Spare parts for in-car electronics (housing and contacts):
Crimping butt connectors and contact sleeves for fan connectors up to
2.5 mm2
Crimping butt connectors and contact sleeves for fan connectors from
2.5 mm2
Crimping contact sleev
NOTE: Vertical acceleration sensor adjustment must be performed after
replacement of
the spring strut/shock absorber with damper satellites.
Connect vehicle to BMW diagnosis system.
Select and perform vertical acceleration sensor adjustment under Service
functions.
NOTES ON AIR SPRING SYSTEM
Comp