Unlike an outboard motor, the Sea Doo's jet pump has few moving parts. Also unlike an outboard motor, the Sea Doo's jet pump requires some specialised tools. Removing the Sea Doo's impeller requires three service tools in addition to those normally found in a boater's toolkit. Two of those tools are used only in the removal and replacement of the impeller. Of course, once you remove the impeller, reinstalling it is nothing more than reversing the removal process.
- Skill level:
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Things you need
- Rubber mallet
- Impeller shaft holder (Part No. 295 000 082)
- Bench vice
- Propane torch
- Impeller remover-installer (Part No. 295 000 001)
- Adjustable wrench
- Impeller housing remover (Part No. 295 000 113)
Remove the three screws from the venturi with a screwdriver. Remove the three screws holding the impeller cover and tap the cover with a rubber mallet to free it from the jet pump housing.
Fit the impeller shaft holder over the flat end of the impeller shaft and secure it in place with two of the three screws removed from the venturi. The impeller shaft is flat on two sides, so installing the impeller shaft holder locks the impeller in place for removal.
Lower the impeller shaft holder into a bench vice and tighten the vice. Heat the centre of the impeller with a propane torch to break down the factory-applied loctite on the bolts.
Tap the impeller remover/installer into the splines in the centre of the impeller with a rubber mallet. Turn the hexagonal end of the impeller remover/installer counterclockwise with an adjustable wrench to unscrew the impeller.
Brace the outer legs of the impeller housing remover on the sides of the jet pump housing and lock the inner grips of the impeller housing remover under the impeller. Rotate the impeller while pushing downward on the handles of the impeller handle remover to remove the impeller from the housing.
Tips and warnings
- You can check the impeller's condition quickly from underneath the vessel by removing the intake grate and looking through the water-inlet opening.
- The Sea Doo service manual cautions that impeller condition and impeller-to-wear ring clearance should be checked every 100 operating hours or seasonally.
- According to the Sea Doo service manual, if the engine lacks acceleration or power, it's likely the impeller leading edge is damaged. If the engine runs too fast, the impeller pitch is too low. The impeller part number is stamped longitudinally on the hub.
- If the jet pump cavitates, either the leading or trailing edge of the impeller is damaged. In each of these instances, the cure is impeller replacement.
- If there are abnormal noises from the propulsion system, weeds or debris might have found their way into the impeller or intake grate; clean the grate.
- Disconnect the negative cable of the vessel's battery before performing any maintenance work to prevent electrical shock or accidental starting.
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