Thank you for this. The engine is from a 1975 XJ6 so I believe there is no “slinger”.
The videos I have seen online dont really give the full story for the XK engine and see to point to a process different from what you say here…
The critical detail here, seems to be that the seal has to be fitted in the timing cover + sump first, then the spacer pushed in, right? This is quite different from what I see on the YouTube videos for other engines.
What is still not fully clear to me is what to do with the yellow tube inside of the seal… Remove before pressing the spacer in or use it as a guide over the spacer? If the latter, then the spacer cannot be pressed in after the seal is in place.