Rubber impeller for water pump. The scrapping sound you hear could be rings on dry rusted cylinder walls. Even though you used fogging oil. Take plugs out, tilt engine up high as you can and rotate where 2 cylinders are pointed up. Spray a bit of penetrating oil in each cylinder and slowly rotate with socket and ratchet a couple of times while spraying in a little more oil. Let sit over night then do other side let sit. Them tilt back down rotate a few times then spin over with starter. Not much just enough to make sure it’s free. Remember your crank and bearing are probably pretty dry because of no oil for a long time.