Re: Nissan 5hp outboard problems
Gotta agree with the other replies. The 2-smoke 5's will take a lot, but if you severely overheat it and seize it, all bets are off. Once the cylinder is warped, it will never be the same, and if so, you will find that it's uneconomical to repair. Verify the cooling water's flowing before you take it on another run.
The pee hole is on the bottom of the powerhead (in what is called the "base" casting). It only indicates that there is cooling water pressure, and is prone to clogging -- especially if you are in salt or debris-laden water, so it is possible to be cooling correctly, and not have a stream from the pee hole.
Nissan recommends annual impeller changes. Even with the cold freshwater and short season in Buffalo, we do them at least every third season. The rubber does dry-rot, after all. Nissan has a water pump kit, available from any dealer, which includes the impeller, bolts, and associated wear parts. It's a bargain, since most of the cost of an impeller change is in the labor.
If that gets you pumping again, fine. If not, you probably have corrosion and junk in the powerhead. That may be a trip to the dealer for service, depending on your skills.
Once you are sure that the water pump is pumping, the pee tube can be cleared while running (in the water, of course), by pushing a stiff wire or weed-whacker string into it. There is also a "clean-out" plug (and gasket) near the pee tube, in case there is so much debris that it's floating around in the base casting like gravel. Think twice about pulling that plug on an older motor, as you may damage the threads in the base casting by removing it.
