I have a 73 50hp 4cil mercury. Overheated at lake so brought home and replaced impeller which was the problem . After doing this I ran water thru muff none cameout the pee hole however it do come out the prop and around the lower unit. When I flush from the pee hole it comes out around the lower unit where it bolts to the motor. Not sure if I explained that very well.Also dripping water slowly around bottom spark plug. Not sure where to go from here.
<br /><br />Try taking the telltale hose off at one end and flush it out then. It may have a chunk of something just shuttling back and forth in the hose between fittings. It's also possible that you didn't get the pipe in the pump when you remounted the gearcase.<br /><br />The overheat caused that leak by the sparkplug. Chiseling the gasket off so you can replace it is a nightmare. Keep an eye on it. If it's minor enough, it'll probably lime-up and stop. Or not.