40 hp Nissan two stroke outboard potential water pump malfunction

This is a 40 hp Nissan two stroke outboard motor that looks to have a water pump that is not pumping water to the top of the engine 

[@shaneletson]

Since u solved my problem I been having with mine 25hp just like this one I'll help u out im pretty sure your right on that water hole back there there's like a vacuum hose going down to it inside the housing there if you r standing at the back out the motor there that hose will b coming from the left of the engine block down to that hole there n the middle yours must b an older model because mine water shoots out the right of the motor there where the hood latch is if your standing at the back of the motor mines water shoots out beside that latch on the right through a white peace but I'll save u from keep buying the rubber impeller n there I found out that these boat places u take them to wont tell u anything about these types of motors and they will give u a run around on these types of motors wanting u to bring it to them and then fix it how I found out they was saling me a water impeller that looks the same as the one that comes out of this motor they look identical but one thing the rubber impeller that comes factory n these types of motors r thin propeller I call the finger and on the new one they give u to replace this impeller has thick ones and they will get hot and when you tighten the bolts down of the water pump housing it will kinda lock your shaft maki g it hard to turn the shaft that will cause the rubber impeller to get your housing g hot and melt you housing again and u will never figure out why your motor keeps melting the housing of the water pump and then having to keep fixing it because you can't figure it out and u no there going to do this to u at least once to get more cash out of u when these places that fix these types of motors know damn well the thin water impeller goes n there instead of the thick ones I found out on mine I bought new water pump housing rubber impeller and the hole none yards burnt it up so I go to a different place but this time I buy the water pump kit again and they had an old motor out back that they took the motor out of the housing and through the rest of the motor n there jump Pyle so I bought the hole motor housing the lower unit everything but the motor for extra parts for mine but this housing with no motor was like brand new but had been welded on the lower unit I by this housing with no motor from them for $100 bucks but it's a long shaft but all I needed was the lower unit parts they all looked brand new i get this housing home and got all the lower unit gears out of it and it had like a brand new water pump with the factory rubber impeller n it so I compared the two rubber impeller the factory one that was brand new n the old housing I bought had a thin rubber impeller as it's fingers and the new one had thick rubber impeller so i changed the bearing that's under the water pump from from the housing I bought like new bearing under the water pump got the thin rubber impeller that came factory that Nissan put n there and put that rubber impeller n there and it turned the shaft a hole lot better with the thinner finger rubber impeller that came factory n the old junk housing I bought when the new thick rubber impeller locked the shaft when I tightened the bolts back up and I got the reverse gear n the lower unit with bearing brand new and the hole forward gear housing n the lower unit brand new and changed all this from the old junk housing I got from there junk Pyle that I gave they $100 for it made mine brand new lower unit water impeller turned a lot smoother and did not lock the shaft when u tightened the bolts down and I got the bearing under the water pump brand new hope this helps u as these types of motors parts r getting harder and harder to find

[@ryanmichael3052]

It's definitely the water propeller. I didn't see anything out of the exhaust either. Cheap fix. Have to pull the foot though but it's still easy. Good luck

[@averagejoe717]

@@ryanmichael3052 yes I did swap out the impeller and it works fine now