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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
Unscrew nuts.
Remove shims.
Installation:
Replace self-locking nuts.
Fig. 162: Locating Nuts
NOTE: Raise and/or turn fluid reservoir in order to gain better access
to plug
connection.
Disconnect plug connection (1).
Turn level switch (2) through approx. 45º and remove towards bottom.
Fig. 163: