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Strong Shaft seal life expectancy

Discussion in 'Props, Shafts & Seals' started by Salish Capt, Sep 16, 2025.

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  1. Salish Capt, Sep 16, 2025
    #1
    Salish Capt

    Salish Capt New Member

    Joined:
    May 9, 2015
    Messages:
    1
    Location:
    Whidbey Island,,WA.
    At what time frame should a Strong Seal prop shaft seal be replaced/
  2. Capt Ralph, Sep 16, 2025
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    14,041
    Location:
    Satsuma, FL
    Usually when it fails.

    I don't mean to disrespectful here but it is hard to answer your question any other way.
    Later shaft seals can last years, with luck longer.
    Under stress, Silt, lack of water, shaft vibration, fouling and other faults can heap a seal fail in a week.

    This is why a spare seal (or two) should already be on your shaft as a backup.