BMW N55 Manual page 21

The graphic below illustrates the small end of the connecting rod with a formed hole. The
force is more evenly distributed over a larger area and the load on the edges of the rod
bushing is reduced considerably.
N55, connecting rod small with formed hole
Index
A
B
Lead-free bearing shells are used on the large connecting rod end. The material G-488 is
used on the connecting rod side and the material G-444 on the bearing cap side.
The size M9 x 47 connecting rod bolts are the same on the N55 and N54 connecting
rod.
Explanation
Low surface load
High surface load
21
N55 Engine