Thanks for all the advice! Any idea how to change the gear lube, and what to replace it with? The manual has some odd terminology when it comes to lubricants, nothing with conventional viscosity figures (ei: 75W-90). There are two bolts down on the left side, they look like the classic fill plug...
My wife's grandfather left behind an old alumicraft with what I think is a '71 Mercury 500 50hp (serial # 3095395) outboard hanging off the back. It's been sitting since the early 90's on the edge of a lake in MT. I took the tarp off it on my last trip up there, took the covers off and it looks...