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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
Special tools required:
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WARNING: Danger of injury!
Owing to the new guidelines on pedestrian protection, side panels are no
longer suitable for supporting the engine.
Observe following instructions relating to special tool:
P