Impeller Change - Replacement G23

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  • Scooter G
    1,000 Post Club Member
    • Jan 2022
    • 1487

    • On a Lake in Idaho

    • 2022 G23 ZZ8

    #1

    Impeller Change - Replacement G23

    There have been a few posts and maybe a Youtube or 20 on the topic. I thought I would throw out a step by step for any that may want to attempt this on their own. Probably one of the easier things to attempt on your own. If you are not snapping pictures along the way, a fresh water impeller replacement can be done in under 30 minutes.

    Required tools: New Impeller & O-Rings, 1/2' ratchet or preferably a 1/2" breaker bar for leverage on the belt tensioner, 10mm deep socket or boxed end wrench for the pump cover, a pick or really small bladed screwdriver for the O-Rings, rags, a really bright light(s).
    Oh and, so I don't get called out on this one, chips & beverages


    I want to add to this 1st picture of the impeller below. Sometimes we get in a hurry, but when you pull your old impeller, check it for size against the new impeller. Very unlikely you got it wrong, but you'll save yourself a headache or worse, just to double check.
    Click image for larger version

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    Pull the port side locker panel, you can access what you need from here.
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    1/2" breaker for belt tension pulley
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    Lefty loosey, counter clockwise until belt is relaxed on water pump pulley
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    Rock pulley preferably clockwise to align holes in pulley with the pump bolts (10mm)
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    I've had this impeller pulley laying around for a while, have never used it. I've pulled impellers with pliers or channel locks before. I will give it credit for removing the impeller unharmed in one piece. Although I think this one would of slipped out, without much effort.
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    Pick out cover O-Ring. There are also 3 O-Ring's that seal the bolts, and keep them from falling out into the depths of never seeing them again belly pan. I don't replace these but maybe every 2 or 3 change outs. Choose your own preference here.
    Click image for larger version

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    This will be user preference. Anything that moves gets white litho, and if it has threads, it gets anti-seize. It has always worked for me, not open for debate. Do what works for you.
    Coat the housing, impeller, and cover. You can also use soap as charlesml3 mentions below. This will make the impeller slip in easier.
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    Clockwise rotation to make sure everything is seated and intact.
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    Reseat belt. If you get a little wild in the process and knock the belt off of a couple of pulleys, there is a diagram. If not, I hope you took a picture 1st.
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    Maybe a little over the top, but anything that gets changed on a regular basis, gets a label, everything (except for the light bulbs & underwear, those are pretty obvious). Too many toys to keep track of, and running to a spreadsheet sometimes get's neglected.
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    I hope this helps if you have thinking of attempting this. Those that do their own maintenance can do this one with their eyes closed.
    I didn't show the new impeller slip in, but if you got the old one out, it's pretty obvious at that point. I would suggest a clockwise spin to get the impeller vanes headed the correct direction, but at the end of the day, one could argue that it really matters, they will take heed the direction they need to go. Be snug but soft of the bolt torque, you are threading into brass. Check for leaks on fire up.
    See you on the water...
    ~Scooter G
    Attached Files
    Last edited by Scooter G; 04-09-2026, 03:40 PM.
  • charlesml3
    1,000 Post Club Member
    • Jan 2008
    • 2483

    • Lake Gaston, NC

    • 2022 G23

    #2
    The only thing I'd add would be:

    - Coat the new impeller in hand soap or something to make it slip into the housing easier

    -Charles

    Comment

    • Scooter G
      1,000 Post Club Member
      • Jan 2022
      • 1487

      • On a Lake in Idaho

      • 2022 G23 ZZ8

      #3
      There in lies the White Lithium, if it moves...
      Coat the cover plate, housing, and impeller.
      And you are correct, thanks Charles, night and day easier.

      Comment

      • uga5
        • Apr 2024
        • 2

        • GA


        #4
        Whoa - those hooks on your side engine cover panels look great. Where did you get them?

        Comment

        • bturner
          1,000 Post Club Member
          • Jun 2019
          • 1756

          • MI

          • 2016 200 Sport Nautique

          #5
          Excellent write up. Love seeing these types of documented maintenance procedures.

          Comment

          • Scooter G
            1,000 Post Club Member
            • Jan 2022
            • 1487

            • On a Lake in Idaho

            • 2022 G23 ZZ8

            #6
            Originally posted by uga5 View Post
            Whoa - those hooks on your side engine cover panels look great. Where did you get them?
            Best fold down rope hooks ever. Nautique nailed it with that one, out of sight, out of mind if you're not using them. Not sure what year they started putting those on the engine/locker panels. After using them, and I didn't have them, I would be coming up with something similar. Best thing, everyone knows exactly where the ropes go at the end of a session.

            Comment

            • GMLIII
              1,000 Post Club Member
              • May 2013
              • 2821

              • Smith Mountain Lake, VA (Craddock Creek area)

              • 2017 G23 Coastal Edition H6 | 2001 Sport Nautique | 1981 Ski Nautique

              #7
              uga5 Nautique Parts. I ended up install 2 additional hooks like these on each side of the engine side covers for a total of 4 on each side of the stern locker areas.

              Rope Hanger - Nautiqueparts.com

              Comment

              • Holy
                • Apr 2026
                • 1

                • Texoma

                • '19 G23

                #8
                The writeup looks good though the pics appear to have bad links. Anyone know of a similar post with Pics?

                Comment

                • Scooter G
                  1,000 Post Club Member
                  • Jan 2022
                  • 1487

                  • On a Lake in Idaho

                  • 2022 G23 ZZ8

                  #9
                  Updated pictures (AGAIN), should be good to go
                  Last edited by Scooter G; 04-11-2026, 09:25 AM.

                  Comment

                  • Dedic761
                    • Jun 2026
                    • 1

                    • Owosso, Mi

                    • 2020 G23 Paragon

                    #10
                    Same process for the ZZ8? I have a 2020 Paragon and looking to do the same. Thanks!

                    Comment

                    • Scooter G
                      1,000 Post Club Member
                      • Jan 2022
                      • 1487

                      • On a Lake in Idaho

                      • 2022 G23 ZZ8

                      #11
                      I would love to hear or better yet see the ZZ8 process.
                      I had the new impeller in hand, pulled the side panels, and said nope, Dealer gets this one. After shelling out over $500 bucks to have them change out the impeller, I decided I would figure out how to do it myself for the next rodeo. There is an air filter box on one side, and something else on the other side. Maybe it's as simple as pulling the filter box to gain access, but it just looked overwhelming to me at the time.

                      Comment

                      • DoubleUpDisaster
                        • Feb 2020
                        • 81

                        • Southern WI

                        • 2019 G21

                        #12
                        Great write up. I just want to add that white lithium grease can cause rubber to swell, dry out, crack, etc. At the rate we swap these things out it probably doesn’t matter, but in general, silicone lubricant would be better for rubber.
                        Last edited by DoubleUpDisaster; 1 week ago.

                        Comment

                        • Scooter G
                          1,000 Post Club Member
                          • Jan 2022
                          • 1487

                          • On a Lake in Idaho

                          • 2022 G23 ZZ8

                          #13
                          That's a why did grandma cut the tail off the turkey before it went in the oven Conundrum.
                          So it would fit in the pan, and that's the way we have always done it, lol.
                          Closest item on the shelf, better than nothing, and doesn't stay in the system long enough, but you are correct, silicone would be a better choice here.
                          Thanks for the clarification, appreciated.

                          Comment

                          • BasaltRMK
                            • Apr 2020
                            • 315

                            • Basalt, CO

                            • 2024 SAN G23 2020 SAN G21 (Sold) 2018 SAN G21 (Sold) 2015 Tigé R20 (sold) 1972 MFG Gypsy-15 Tri-hull (sold)

                            #14
                            Scooter G and Dedic761 - the ZZ8 / ZZ8s impeller swap is much easier - no belt to loosen or pulley to remove. I did mine myself for the first time this season. just unscrew and remove the back set of engine divider panels as well as the slide out front ones. Yes, depending on which side you attack it from, you'll have to also remove the airbox (port) or rudder grease fittings (starboard) from those back panels. I went from the airbox (port) side; good excuse to get an K&N Recharge kit and clean / oil the air filter. May try it from the other side next season. But then it's just removing three bolts from the impeller cover, popping out the impeller, and putting the new one in. Probably 20 minutes now that I've done it once. Dealer charged you $500????

                            Now I just need to figure out why I'm getting some weird temperature fluctuations - see my forthcoming post. I don't think it's related to the impeller change...

                            - bob
                            Last edited by BasaltRMK; 4 days ago.

                            Comment

                            • Scooter G
                              1,000 Post Club Member
                              • Jan 2022
                              • 1487

                              • On a Lake in Idaho

                              • 2022 G23 ZZ8

                              #15
                              What the freak, I paid over $500 bucks for that. I feel so violated, that's ridiculous, lol.
                              Ohh, we don't like temperature fluctuations, time for the cat to chase the mouse.
                              Muchas Gracias for the info BasaltRMK, looking forward to giving it a try next Season.

                              Comment

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