As the title says, this is an aircraft engine fitted to DC10-30, A300-B and B747 (classic).
Side on shot, of a complete engine (this particlar model is for a B747 classic)
This is one of the attaching points, the Forward Engine Mount. The yellow lump of metal is tooling to enable to move the engine around the shop. The Forward Engine Mount uses only TWO bolts to attach it to the pylon (at that location).
This is the Aft Engine Mount. Four bolts are used here to attach it to the pylon.
Approximate stats are...
Weight 4000Kgs
Height 270CM (+ stand)
Length 470 cm (+ nose cowl + exhaust nozzle)
Width 240 cm
by-pass Ratio 4.5/1