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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
REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE
IMPORTANT: Observe safety when raising the vehicle.
Driving without reinforcement plate is not permitted!
Release bolts (1) for assembly underside protection at front.
Release bolts (2).
Remove reinforcement plate (3).
Installation:
Replace sc