New Generation N62 Engine Chapter 3 P.14
Course Contents/Background Material
© BMW AG, Service Training
Fig. 13: Cylinder head cover with labyrinth separator
The crankcase vapours (blow-by gases) produced during
combustion are carried from the crankcase and into the cylinder
head cover via a labyrinth separator.
The oil which accumulates on the walls of the labyrinth
separator flows into the cylinder head via a siphon, and from
there flows back to the sump. The remaining gases are passed
back to the engine for combustion via the pressure control
valve (5) in the intake manifold.
One labyrinth separator with pressure control valve is integrated
in each of the two cylinder head covers.
The throttle valve is controlled such that there is always a
vacuum pressure of 50 mbar in the intake manifold.
The pressure control valve regulates the crankcase pressure to a
low 0-30 mbar.
Index Description
1-4 Openings for spark plugs
5 Pressure control valve
6 Opening for Valvetronic motor
7 Opening for Valvetronic sensor connector
8 Camshaft sensor
KT-7711
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