How to Replace a Jet Ski Impeller

Replacing a jet ski's impeller routinely will allow the jet ski to function properly. The impeller functions as a small propeller, pulling the water through and creating propulsion by shooting the water out the back of the impeller. The impeller can wear out and should be replaced at least annually, depending on how often you use the jet ski. You can replace the impeller yourself with just a few common shop tools in about an hour.

Things You'll Need

  • Screwdriver
  • Socket wrench
  • Open-end wrench
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Instructions

    • 1

      Unfasten the screws on the top of the ride plate with a screwdriver and remove the plate to reveal the jet ski water pump. Loosen the bolts on the top of the pump with a socket wrench and take the housing off the top of the siphon bilge pump.

    • 2

      Lift the siphon bilge pump up and disconnect the steering cable from the pump with an open-end wrench. Unfasten the hoses from the pump by loosening the screw clamps with a screwdriver, then removing the hoses.

    • 3

      Loosen the bolts from the top of the reduction nozzle with the socket wrench and remove the nozzle to expose the impeller. Unfasten the impeller from the shaft rod with the socket wrench and slide the impeller off the rod, removing it from the jet ski.

    • 4

      Apply a thin layer of marine grease along the impeller shaft and fasten the new impeller to the shaft rod. Attach the reduction nozzle and connect the hoses to the siphon bilge pump.

    • 5

      Attach the steering cable to the bilge pump and set the pump inside the housing. Secure the housing back on the pump with bolts, and reattach the ride plate over the pump with screws.