I have an Evinrude 6 hp motor. I'm not positive of the year, but think it's mid 70s vintage. I want to replace the water pump, impellar, but can't get the lower unit to drop. Through the upper/lower crack, I can see a coupling with two bolts. Is this what I losen? If it is, there doesn't seem to be enough room to fit in a wrench. Barely enough for a screw driver and then I can't break to bolts free. Appreciate any advice. Also, the serial no is J0003087, model is 6504R. Anyone tell what year this motor is.
