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Replace I/O Water Pump

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  • Replace I/O Water Pump

    Well my friend and I did it today; we ran his 165 mercruiser w/250 GM in line, doing carb repair work, and both of us thought the other turned on the water hose - now, we get no water. We assume we burned up the water pump in the outdrive. Question - is the removal and replacement of the water pump impeller in a 165 mercruiser a projec that someone with no experience doing this should do?? I have been told that it is not the removal that is the problem, it is getting it back together correctly that is the issue. What do ya'll think?


  • #2
    Re: Replace I/O Water Pump

    Go to the top of this page......Click on Manuals......Buy 1.....READ It......Then, It's a Piece of Cake.....BTW, Buy the Complete Waterpump Kit.... I'm betting you Fried the housing Too....
    Any Grease is Better,..... Than No Grease at All.......

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    • #3
      Re: Replace I/O Water Pump

      Thanks bondo, got a book, have read it, seems simple enough. Guess we'll have to give it a shot. Best price, so far, in owners area (Orange Beach, AL) is $250.00 for a repair shop to do it.

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      • #4
        Re: Replace I/O Water Pump

        If you've got an Early Mod.1, with the Plastic Flush Screw in the gearhousing, You'll need Part # 18-3321.... That's $77.56 list, $43.30 if your NAPA Auto Parts Guy Likes You....Or, If you've got the Late Mod.1, You'll need #18-3317.... $65.60 list, $36.83 jobber...That's the Complete , w/housings...At your local NAPA...
        Any Grease is Better,..... Than No Grease at All.......

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        • #5
          Re: Replace I/O Water Pump

          Thanks man. How do I know if it is a late model or an early model??

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          • #6
            Re: Replace I/O Water Pump

            Early Mod.1, with the Plastic Flush Screw in the gearhousing,
            Any Grease is Better,..... Than No Grease at All.......

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