The engine isn't attached to the wing, per say. Rather, it's attached to a pylon that is attached to the wing. It's been a while since I pulled pylon mounted engine, but here's how it works (at least on the ones I worked on)
The engine has a mount point on top of the engine, forward of the center of gravity. This is a trunnion mount (two mount lugs). On the pylon, there is a single lug hanging down. The single lug fits between the two lugs, and a linch pin is inserted (and depending on the system, may be safety wired into place).
There is a mount framework for the aft portion of the engine. This framework extends from the wing mounted pylon to (at least on the engines I worked with) two "coke bottle" mounts (one at the 3:00 and one at the 9:00 postion). These are also called thrust mounts, this is where the force from the engine is transferred to the wing mounted pylon.
It's difficult to explain without being able to move my hands around and show you (or at least draw it on a piece of scratch paper).
Again, it's been a while since I worked on pylon mounted engines (trained on B-52s for that). Most of my work was on fuselage mounted engines (ten years on F-15s and F-16s as a jet engine mechanic).