Re: Lower unit oil screws stuck
What everybody says. Use a hand-impact screwdriver. They aren't stuck, just tight. They are supposed to be tight.
And you don't have to beat the thing like a fence post either- it will come out.
Something you might want to try first is this: I have a
very large Klein screwdriver that I re-ground the end on. The end is nearly as wide as the plug slot. I made it hollow-ground like a gunsmith's screw driver- the parallel sides don't tend to cam out like tapered sides do. I was careful to not heat it; took my time and cooled in water before it even showed any signs of getting hot. That keeps the temper.
The nice thing about the Klein is that it has a hex-shaped section near the handle that you can put a box end wrench on. That screwdriver has saved me on so many things, but worked perfectly for my old Johnson lower unit screws. That method or the impact driver will work. Don't beat on the plug unless it is a last resort and you already have replacement parts.