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With regard to the N54 engine, the air intake ducting plays a significant role
due to the requirements of a
turbocharged engine.
In principle, the energy of the escaping exhaust gases is utilized to
"pre-compress" the inducted fresh air and
thus introduce a greater air mass into the engine. This
Special tools required:
31 4 170
Remove front wheel.
IMPORTANT: Expand turning lock sufficiently to avoid damaging thread
when releasing collar nut.
Release collar nut (1), press brake pedal to floor for this purpose.
Fig. 140: Identifying Collar Nut
Remove left microfilter housing cover.
IMPOR