QUOTE(malcolm2 @ Feb 6 2023, 11:19 PM)
show some pix of it mounted that way. I would have bet that it mounted as your original picture.... But I have never driven a 911.
The thicker portion of the dual lip seal has a garter spring behind it (circled in red) - the thicker lip that has the spring belongs on the inside toward the bearing.
Picture from 911 factory manual.
Click to view attachmentThe smaller secondary seal, purple in my original “drawing” without the garter spring will always go to the outside. This secondary seal has little pressure on it. It’s main purpose is to simply keep debris away from the main seal so that it doesn’t become contaminated and wear prematurely.
Off topic seal trivia:
On seals used in very wet and very dirty environments they will sometimes have a third part of the seal called a flinger. Usually made of metal or rigid plastic. It’s purpose is to keep the super large debris / mud away from the rubber portions of the seal behind the flinger.