BMW S58, Owner'S Handbook Manual

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S58�Engine
4.�Engine�Mechanical
23
If�there�is�a�complaint�about�higher�oil�consumption�and�at�the�same�time�an�exhaust�turbocharger
fouled�with�oil�is�diagnosed,�then�it�cannot�be�immediately�concluded�that�the�exhaust�turbocharger
is�faulty.�If�the�fouling�is�already�present�after�the�introduction�of�the�blow-by�gases,�then�the�entire
engine�must�be�checked�for�leaks.�The�cause�of�an�excessive�blow-by�gas�flow�rate�may�be�faulty
gaskets�or�crankshaft�seals.�Leaking�crankshaft�seals�may�generate�oil�consumption�of�up�to�3
liters/1000�km�(620�miles).
4.1.6.�Engine�cover
The�engine�cover�was�adapted�to�the�S58�engine.�The�engine�cover�is�also�the�intake�silencer�of�the
S58�engine.
S58�engine,�engine�cover
4.2.�Crankshaft
4.2.1.�Crankshaft�with�bearings
Crankshaft
The�crankshaft�is�an�optimized-weight�design�and�has�been�adapted�to�the�high-revving
characteristics�and�greater�power�output�of�the�S58�engine.�Thus�the�crankshaft�of�the�S58�engine
weighs�approx.�21.2 kg�(47�lbs).�The�crankshaft�is�also�called�a�lightweight�construction�crankshaft.
The�crankshaft�is�made�from�a�steel�alloy�42CrMoS4�Mod�and�is�then�nitrocarbonized�in�the�gas.
The�timing�chain�and�oil�pump�are�connected�by�gears.