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  1. #1
    Cadet
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    Default 1990 Mercury 25 hp water pump

    To my knowledge the water pump impeller has never been changed on this 1990 - 25 hp-2 cycle motor. It seems to be working fine. Is the impeller something that should be changed periodically as preventive maint.?

    Thanks for your help

  2. #2
    Moderator achris's Avatar
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    Default Re: 1990 Mercury 25 hp water pump

    Quote Originally Posted by GSA51 View Post
    To my knowledge the water pump impeller has never been changed on this 1990 - 25 hp-2 cycle motor. It seems to be working fine. Is the impeller something that should be changed periodically as preventive maint.?
    Urr, yes!

    When the impeller dies, the engine dies.... Keep your engine healthy by servicing the water pump (changing the impeller) at least every 2 years....

    Chris.........
    The world takes on a whole new perspective when viewed from 100' below...



    1972 Bertram 'Bahia Mar' 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
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    Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
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  3. #3
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    Default Re: 1990 Mercury 25 hp water pump

    Thanks - I figured as much. Any tricks that might make changing the impeller easier?

  4. #4
    Moderator achris's Avatar
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    Default Re: 1990 Mercury 25 hp water pump

    Quote Originally Posted by GSA51 View Post
    Thanks - I figured as much. Any tricks that might make changing the impeller easier?
    Use the genuine manual... Don't have one? download HERE. Password for the file is ribforum. I know that manual is for 1994 and up, but the engine hasn't changed dramatically between yours and 1994. The procedures are exactly the same...

    The manual explains exactly how to do it.... Just watch out for the little washer that falls off the shift shaft as you pull the gear housing out. ...

    Chris........
    The world takes on a whole new perspective when viewed from 100' below...



    1972 Bertram 'Bahia Mar' 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
    **
    Please don't send service questions in private messages. That's what the forum is for. Messages of thanks, always accepted.
    **
    Member of the month - April 2013. http://www.iboats.com/blog/achris-member-of-the-month/

  5. #5
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    Default Re: 1990 Mercury 25 hp water pump

    Thanks much for your help! That should make the job considerably easier. Heading North for a fishing trip and wouldn't want it to die in the middle of my trip.

    Again, Thanks

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