BMW S58, Руководство пользователя

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S58�Engine
7.�Oil�Supply
52
Index Explanation
A Intake�side
B Major�thrust�face
C Direction�of�flow/direction�of�rotation
1 Intake�port�(turbocharger�and�front�right�sump)
2 Intake�port�(front�left�sump)
3 Return�flow�opening�in�rear�sump
4 Oil�pump�drive
5 Sprocket
6 Pressure�chamber
7 Impeller
7.6.�Oil�spray�nozzles
Two�types�of�oil�spray�nozzle�are�used�on�the�S58�engine.�They�are�the�conventional�regulated�oil
spray�nozzles�with�a�permanently�set�opening�and�closing�pressure,�and�the�switchable�oil�spray
nozzles.
S58�engine
Switchable�oil�spray�nozzle
Opening�pressure 0 bar
Closing�pressure 0 bar
Controlled�oil�spray�nozzle
Opening�pressure >�4.3 bar
Closing�pressure <�4.0 bar
The�controlled�oil�spray�nozzles�used�on�the�intake�side�of�the�crankcase�are�conventional�oil�spray
nozzles�with�a�permanently�set�opening�and�closing�pressure.
The�oil�spray�nozzles�do�not�open�until�the�oil�pressure�reaches�4.3 bar�in�order�to�ensure�sufficient
piston�crown�cooling�regardless�of�the�load�at�high�engine�speeds.�The�oil�spray�nozzles�close�again�if
the�oil�pressure�falls�below�4 bar.
The�switched�oil�spray�nozzles�on�the�exhaust�side�are�brought�into�action�for�cooling�at�high�loads�and
engine�speeds�and�also�for�lubrication�at�very�low�engine�speeds�with�high�engine�loads.
In�order�to�achieve�an�optimum�cooling�effect,�it�is�essential�to�position�the�oil�spray�nozzles�exactly.
Non-compliance�may�lead�to�damage�to�the�engine.�Please�observe�the�current�repair�instructions�in
the�BMW�workshop�system�ISTA.