Ducati Diavel Workshop Manual page 615

Lubrication system: oil cooler
Start the nipples (5) on the oil cooler (1) and tighten them to a torque of 23 Nm ± 10% (Sect. 3 - 3, Frame torque
settings).
Lubricate the nipples threads (5) with engine oil.
Attach the hoses to the nipples (5), finger-tightening the ring nuts (F) of the hoses on the nipples.
Tighten the ring nuts (F) to a torque of 18 Nm ± 5% (Sect. 3 - 3, Frame torque settings).
If the horizontal exhaust heat guard assembly was removed, on refitting insert the screw (16) with a washer (17) in heat
guard (14) to join it to the exhaust protection (15), and then fit the other washer (17) with spacer (18) on the protruding
end of the screw.
Note
The spacer (18) must be oriented with the collar (G) facing the heat guard (14).
Fit the heat guard (14) on the exhaust protection (15) by tightening the screw (16) to a torque of 3 Nm ± 10% (Sect. 3 -
3, Frame torque settings).
Fit the heat guard (14) and heat protection (15) assembly on the horizontal cylinder head with support (10) by tightening
the screw (11) to a torque of 10 Nm ± 10% (Sect. 3 - 3, Frame torque settings).