Ducati SCRAMBLER 800 Workshop Manual page 828

Refit the mesh filter (9).
If previously removed, refit the stud bolts (16) on the crankcase halves, applying sealant on the thread and
tightening to a torque of 30 Nm (Min. 28 Nm - Max. 32 Nm).
Make sure that the O-rings (20) are fitted on the crankcase.