I need to remove the lower unit on my 1979 35 hp Evinrude I have removed the four bolts and top nut but something else is preventing the lower unit from coming off. The lower unit is one solid outer casing. I have ordered a manual but it has not arrived yet and I would like to replace the gear oil seals so I can get out on the water this weekend. Oil is leaking from the top of the lower unit and Water has contaminated the gear oil obviously since it was brown from where it is leaking up top and milky white when I drained the gear oil before attempting to remove the lower unit. So I hope it is just the seals. I plan on inspecting everything once i do get the lower unit off ie. berring, shaft, and water pump. Hope fully the seals are the only issue.