Ducati Diavel Workshop Manual page 677

Cylinder head assemblies: timing system
Approach the tool code 88765.1623 to insert the pins (F) in the timing shaft seats (G).
Position the tool code 88765.1623 with legend "UP" and the arrow facing the cylinder head cover.
First place the pins (F) of the tool with part no. 88765.1623 in the intake side pulley with the wrench of tool with part
no. 88765.1623.
Place the pins (F) of tool code 88765.1623 in the exhaust side pulley manually.