Ducati Diavel Workshop Manual page 813

Crankcase assembly: crankcase halves
Add 0.30 mm preload for crankshaft axial bearings to bed in correctly into their seats (inner rings seated inside outer
ring).
Thus, we obtain:
SA=LA1+LA2+0.30-LA.
To calculate the thickness of each shim note that:
SA=SA1+SA2
where "SA1" and "SA2" represent the shims for the clutch-side crankcase half 1 and the alternator-side crankcase half 2.
Considering the alignment of the shaft, this gives:
SA1=LA1+0.15-LA/2;
and finally, the second shim thickness: SA2=SA-SA1.
In addition to the above procedure, the following is a practical shimming method, providing a guide on how to calculate
the crankshaft shim thickness accurately.
Install a shim of minimum thickness (1.90 mm) on each side of the crankshaft to prevent contact between the crankshaft
web and the crankcase.
Install the crankshaft and assemble the two crankcase halves.
Fit four M8 screws in the seats indicated in figure and tighten them to a torque of 19 Nm (Min. 17 Nm - Max. 21 Nm)
(Sect. 3 - 3, Engine torque settings).