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After removing the 5 nuts that hold the gear case on, remove the water pump housing. Take the old impeller out of the housing. Install the new impeller and gaskets onto the base of the water pump. Making sure to get the key aligned into the impeller. Slide the housing down onto the impeller while turning the drive shaft clockwise. Once it seats, reinstall the 3 nuts and 1 bolt. Grease the drive shaft and shift shaft, and reinstall the gearcase.