Repairing a watercraft pump impeller is a job that can be completed in about an hour or two. The pump impeller sits inside the water pump housing at the top of the gear box and should be replaced routinely to keep the water pump operating properly. Repairing the watercraft pump impeller is a matter of replacing the impeller as well as the worn gaskets at the base of the water pump. You’ll save money by repairing the impeller yourself
1) Unfasten the nuts that secure the watercraft gear box to the motor housing with a socket wrench and slide the gear box out of the housing. Set the gear box on its base where you can work comfortably.
2) Detach the bolts from the top of the water pump housing with a socket wrench and lift the housing off the top of the gear box. Turn the water pump housing over and remove the old impeller from inside the pump housing.
3) Lift the rubber gasket and metal plate off the top of the gear box. Take the metal keyway out of the slot on the gear box and clean the old gasket material off the gear box with a putty knife.
4) Wipe any remaining debris or oil from the top of the gear box and the base of the motor shaft with a clean cloth. Place a thin layer of marine grease along the top of the gear box by hand where the water pump housing sits.
5) Apply a thin layer of marine grease to the inside edge of the water pump housing by hand. Place the new keyway into the slot on the top of the gear box and set the metal plate on the gear box with the rounded side facing up.
6) Set the new rubber gasket over the top of the metal plate and put the new impeller inside the water pump housing upside down. Place the water pump housing on the top of the gear box and secure it with the bolts.
7) Slide the gear box back onto the bottom of the motor housing and attach the gear box to the housing with the nuts.
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