Crankshaft
The crankshaft of the N55 is of lightweight design, at 20.3 kg it’s approximately 3 kg
lighter than the crankshaft in the N54 engine.
The crankshaft is made from cast iron (GGG70). The counterweights are arranged asym-
metrically. There is no incremental wheel installed on the crankshaft. The timing chains
are mounted by means of an M18 central bolt.
N55 Crankshaft
Crankshaft Main Bearings
As on the N54 engine, the main bearings on the crankshaft are designed as two
component bearings free of lead. The thrust bearing is mounted at the fourth bearing
position.
Index Explanation
A
Counterweights
1
Main bearing journal 7
2
Oil hole from big-end bearing to main bearing
3
Oil hole from main bearing to big-end bearing
4
Big-end bearing journal, cylinder 4
17
N55 Engine
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