58 super sea horse water pump

[DT35]

I just picked up a boat with a 1958 Super Sea Horse 35 hp. My question is there isn't to much water coming out of the back so I assume i need to check the water pump? (I only ran it in a barrel of water just above the top intake) I have no idea where to start to take this water pump apart as it doesn't seem traditional. If anyone could give me some help on it I would appreciate it.

 

[jimmbo]

You take the engine cowl off, then remove the rear midsection cover. On the starboard side there is a small rectangular cover with 2 screws diagonally opposite, remove it, and then you will see another cover inside, remove it as it provides access to the shift linkage coupler. Loosen and remove one of the screws in the coupler. Now remove the bolts holding the gearcase to the midsection. It should now slide down. Once the gearcase is off the water pump is accessible. This motor uses a recirculating type cooling system and has two water tubes going to the pump

 

[HighTrim]

That motor is thermostatically controlled. So, if the water is cool, or at start up, there will be nothing more than a mist coming from the rear of the motor. When the thermostat says the water is hot enough, it opens, and the flow will increase, until it senses cooler water, then will close again, and again you will have nothing more than a mist. It will continue to do this, opening and closing, while you run.

Also, you need the water lever quite high when testing in a barrel. Almost to a couple inches below the exhaust relief hole you mentioned. The pump is NOT self priming, so it needs to be fully submerged to work properly.

Never remove the thermostat, nor the spring/nylon combo. If you do, exhaust gas could work its way back down to the water pump, rendering it useless. They pump water great, air/exhaust, not so great. Keep the whole t stat assembly in, and in good shape.

 

[F_R]

High Trim just said what I was about to say. I totally agree. What I might add is don't try to figure out the condition of the water pump by watching the discharge. The best thing to do is make sure you have a good pump with a fresh impeller, then don't worry about it. Those motors are super dependable if in good condition.

 

[DT35]

Ok great I will attempt to replace the impeller. Should I do the thermostat as well? If so where could I get one?

 

[jimmbo]

http://www.iboats.com/Thermostat-18...2949789--session_id.899252784--view_id.485812

 

[Chris1956]

Stick a meat thermometer into the rear discharge hole. When warm the mist should be about 140*F.

 

[DT35]

Thanks, I also ordered part # 18-3083 for the impeller. That the right one?

 

[jimmbo]

Thanks, I also ordered part # 18-3083 for the impeller. That the right one?

It will work.

 

[DT35]

Ok if there is another one I should be getting let me know

 

[F_R]

Original equipment number is 777213. Sierra Marine number is 18-3083. Just different manufacturers, your choice. Actually, you've already made the choice. Run it.

 

[PapJones]

Great motor - I had one new back in the day. Last week I picked up a 1960 Evinrude 18 hp Fastwin that had a water pump issue. No water coming out at all. I took the lower unit off and checked the water tube and opened up the water pump housing and all looked great. Put it back together and tried again and still no water com ing out. Back again to open it up and this time look closer at the rubber grommet with the two ears where the water tube comes in. Looked OK but I took it off anyway and discovered torn pieces of the previous grommet in there blocking the water from coming up the water tube from the impeller housing. Someone had obviously replaced the grommet by digging it out and hadn't got it all. I removed the rubber debris, put I all back together, and it is working perfectly now. So, keep working the problem until you get to the bottom of it.