motor is '66 Mercury 500 long shaft. My objective is to change the impeller, but it seems I have at least one more bolt to get off before the lower unit is free. There is a hole above the anode to insert a screwdriver etc. and I'm reading where it may be an allen bolt, does anyone know the size? Also is there a shift linkage disconnect or a water line to disconnect. I am trying to save a little money and I've never changed an impeller before. Thanks in advance.
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