Ducati MONSTER 821 Workshop Manual page 1115

Check the condition of the O-rings (22) of the stud bolts (14) and replace them if necessary.
Use tool (C) part no. 88713.1920, to fit the O-rings (22) in the suitable seats of stud bolts (14).
Now fit the stud bolts (14) on the crankcase halves, applying the indicated threadlocker on the thread and
tightening to a torque of 30 Nm (Min. 28 Nm - Max. 32 Nm).
Use the appropriate commercial tool for this operation.
1115 Ducati Manuals Resource