served my time in a ford rs dealer 89 - 94 so you could say ive done a few, this was how i was taught how to do the sump on rs turbo,s, the inner gasket that is near clutch/flywheel would sometimes get dislodged when refitting the sump due to the angle you have to push it in at when the engine is still in the car, glueing this in stops that happening.