Ducati Diavel Workshop Manual page 656

Cooling system: water pump
settings).
Turn the cover upside down.
Introduce the counterface (8) completely into the generator cover.
The counterface must be oriented so that the white side is faced upwards.
Apply specified lubricant to facilitate the counterface insertion.
Clean the counterface from exceeding lubricant.
Install the water pump impeller (10) and bring completely against the counterface.
Use the special tools to install the snap ring (3) into the proper groove (B), on the impeller (10) shaft, as shown in figure.
apply specified threadlocker on the threads of the water pump delivery unions (4).
If previously removed,
Fit the unions on the water pump cover (12) and tighten them to a torque of 25 Nm (Min. 23 Nm - Max. 27 Nm) (Sect. 3
- 3, Engine torque settings).
Apply recommended threadlocker on the thread of the water pump intake union (18).
Fit the union on the water pump cover (12) and tighten it to a torque of 25 Nm (Min. 23 Nm - Max. 27 Nm) (Sect. 3 - 3,
Engine torque settings).
If previously removed, insert washer (14) into the plug of the water pump cover (15).