Re: 73 evinrude fisherman 6 h.p./ Impeller questions?
If you go back to the start of this Johnson/Evinrude section & click onto FAQ, down near the bottom is a link to 9.9/15hp repairs. There, I also have a 6hp article there.
There is another trick on those motors as there is a cross pin in the upper driveshaft that slides thru a matching hole in the lower seal area that this cross pin puts tension on the seal, pushing it UP to allow the seal to function when the motor is running.
To remove the driveshaft/lower unit after the shifting coupler bolt is removed, you will probably need to rotate the driveshaft enough to allow the cross pin to drop down.