BMW X5: Emissions Management
The N54 and N52KP meet ULEV II requirements for 2007. There are not many
changes to the emission
systems on these engines. The N54 engine has 2 underbody catalysts in addition
to the "near engine" catalysts
already in use from the N52.
The N51 engine, however, is a SULEV II compliant engine which meets the 2007
requirements. In addition to
the 5 existing SULEV states of California, New York, Maine, Massachusetts, and
Vermont - four states have
been added for 2007. These states include, Connecticut, Rhode Island, Oregon and
Washington State.
The N51 emissions measures include:
- Secondary Air System with mini-HFM
- Radiator with "Prem-air" coating
- Lower compression ratio (10:1) via modified combustion chamber and
pistons
- Underbody catalyst in addition to "near engine" catalyst
- Activated carbon air filter in air filter housing
- Steel fuel lines with threaded fittings and sealed fuel tank
- Crankcase ventilation system integrated into cylinder head cover
- Purge system piping made from optimized plastic
NOTE: The SULEV II information above is only preliminary and is
accurate as of 8/06.
Additional information will be released as it becomes available.
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Cooling System
The cooling system of the N54 engine consists of a radiator circuit and an
isolated oil cooling circuit. The fact
that there is an isolated oil-cooling circuit ensures that heat is not
SEE MORE:
Special tools required:
54 1 110
Necessary preliminary tasks:
Remove roofliner.
Remove head airbag gas generator.
Open rear lid.
IMPORTANT: Two persons are required to help in removing the glass
slide/tilt sunroof.
Unfasten plug connection (1) and disconnect.
Installation:
Initialize glass
Necessary preliminary tasks:
Remove front seat.
Remove both rear panels.
Remove inner cover.
Remove active head restraint support.
Bend shaft (1) in direction of arrow.
Pull shaft (1) out of gear (2) and remove.
Fig. 99: Pulling Shaft
REMOVING AND INSTALLING/REPLACING GEARING FOR HEAD REST