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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 of the new NG6 engine have adopted the 6 mm valve stem for the exhaust, the
intake stem remains at
NOTE: Read and comply with Information on replacing shock
absorbers.
Version with Vertical Dynamics Management:
IMPORTANT: Handle the spring strut with care so as to avoid damaging
the control unit (1)
and control valve (2).
Fig. 112: Identifying Control Unit And Control Valve
Necessary prelimina