1996 Jaguar XJS with the 4.0 engine.

So while the shop was attaching my fuel supply line, properly, they noted that the "Pinion Seal was Leaking".

Pics are attached. Not sure what's involved, or if this is something I should let a shop perform? Any suggestions? Is there any "while you're there" kind of things to consider?​​​​​​​

 

Just a small damn-near invisible seep, if that indeed. Just ask them to replace the diff oil and forget it; but be sure they use LSD diff oil. Leave well alone until it starts actually dripping. The pinion oil seal is tightened to a very critical torque using a crush sleeve inside under the seal. It is theoretically possible to renew the seal without a new crush sleeve; but I and others have tried it with no success.

 

The diff oil was something I had changed about a year ago…maybe 18 months. I swear it was fine and dandy before then.

Until then, I had never changed the diff oil, so I figured it was due.

Thanks for the advice. I think I’ll do just that.