BMW S58, Owner'S Handbook Manual

Page: 19 / 102

S58�Engine
4.�Engine�Mechanical
13
4.1.�Engine�housing
The�engine�housing�comprises�the�crankcase,�the�cylinder�head,�the�cylinder�head�cover,�the�sump
and�the�gaskets.
4.1.1.�Oil�sump
The�sump�of�the�S58�engine�is�a�cast�aluminium�design�made�of�AlSi9Cu3.�The�sump�originally�made
of�magnesium�on�the�S55�engine�was�also�replaced�by�cast�aluminium�sump�in�the�course�of�life-cycle
development�of�the�S55�engine.�An�additional�partition�in�the�area�of�the�drive�shaft�passages�in�the
forward�area�of�the�sump�further�restricts�oil�movement�under�longitudinal�and�lateral�acceleration
forces.
S58�engine,�oil�sump
Index Explanation
1 Oil-level�sensor�mount
2 Bulkhead
3 Output�shaft�passage
4 Oil�drain�plug
To�ensure�that�the�engine�oil�in�the�front,�smaller�sump�is�drained�completely�during�an�engine�oil
service,�the�sump�features�a�small�drain�hole�through�which�the�engine�oil�can�flow�into�the�rear�sump.
Sealing�of�the�sump�against�the�crankcase�is�provided�by�means�of�a�spray-on�silicon�sealant.