[Jim Sims]

Never install a dynamic shaft rubber lip seal dry. Do the scratches run the full depth of the bore in the case? Do they have any sharp ridges or chips which might cut the seal? If no to both, you are likely okay. I usually just put motor oil on both the inner seal lips and the outer rubber surface of the seal that contacts the case. However given the scratches in the case bore I would also recommend you coat these surfaces lightly with Curil-T and the inner lips with motor oil. Cheers, Jim