Story and photography by Capt. Vincent Daniello
With lip-seal-type shaft seals like this one, a Tides Marine (www.tidesmarine.com) PSS SureSeal unit, a thin rubber stationary edge inside the seal rides around the rotating propeller shaft. The housing simply holds the rubber seal precisely against the shaft. When a lip seal begins to leak, replace it. Required tools are pretty basic, with one caveat: Large screws in the face cap require a #3 Phillips screwdriver—use a #2 Phillips and you’ll eventually strip the unit’s face-cap screws.