Technical data

5
8
System overview
S85B50 Engine
S85B50
Engine block with bedplate
The lower bearings of the crankshaft in
conventional crankcases are designed as
individual bearing bridges.
In order to reliably take up the piston forces,
these "main bearing bridges" are made of cast
iron.
The bearing bridges are cast and are
machined together with the crankcase
following initial assembly.
In the case of the bedplate-type crankcase,
the crankcase is split at the level of the
crankshaft into the upper section of the
crankcase and lower section of the crankcase,
i.e. the bedplate.
In the split crankcase with bedplate, the
crankshaft bearings are an integral part of a
separate, stable frame, i.e. the bedplate.
The bedplate is machined together with the
crankcase and, after assembling the
crankshaft, mounted to the upper section of
the crankcase.
Features
• The crankcase is additionally stiffened
towards the oil pan by the complete
bedplate. Consequently, the entire engine
is on the whole more rigid and more
resistant to torsion.
• The additional rigidity of the crankcase also
improves the engine acoustics.
• The bedplate makes it possible to
accommodate additional assemblies in the
lower section of the engine.
• The bedplate facilitates simple and fast
assembly of the crankshaft main bearings.
1 - Crankcase with bedplate (grey = aluminium, dark grey = cast iron, blue = water area, yellow = oil area)