Some items from this specific schematic: Crankcase 1, Bearing (8u9), Plug, Oil, Bolt, Flange (1j7).
On this parts fiche the Bolt (682) is the most specified component.
This part-list fiche shows all the components that make up the Ec5000dv Ec5000dve Generator Cylinder - Crankcase (ec5000dv(e)) .