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the pump impeller and housing are mounted to the lower drive unit if you are good with your hands and understand how things work. buy a manual for your motor its easy for mechanically inclined. but simple mistakes will kill your motor and drive.the lower drive is drained of gear oil if oil is milky you have a bad seal. if clean drop lower unit there will be a long vertical drive shaft that stays mounted to the drive. locate all o rings seals and gaskets a replace with new impeller and lock key is located under water pump housing remove cover and inspect parts rubber impeller usually wasted/cracked or melted from lack of water. replace with new cover. follow instructions like they are written also check pick up screens and remove to clean barnacles and debris clean water passages. never run engine dry it takes 15 seconds-to start tearing up new impeller good luck

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Q: How do you change the impeller on a mercury outboard?
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