1976 15hp evinrude not pumping water.

[Logo09]

I have a 1976 15hp evinrude that will not pump water. I pulled the water pump out and it looks good, i am going to replace it anyway since it is apart. I connected my garden hose to the copper tube that goes up into the engine block and you can hear it fill up with water but no water comes out. I really hope i dont have to tear it all apart. What should i do?

 

[OptsyEagle]

Re: 1976 15hp evinrude not pumping water.

You are saying that when you put the garden hose on the copper tube no water comes out the exit holes on the bottom of the skeg? Does the water just stop flowing or squeeze back out the same copper tube? I don't think water will come out the exhaust holes when connected on muffs or with the garden hose fitted as you have.

If that is the case then I would suspect the upper water tube grommet. Unfortuneately to replace it you will need to remove the powerhead.

When you ran it last, did you have it in the water, a barrel or on muffs? As I said, for some reason on muffs, water does not discharge out the exhaust relief hole. Also in a barrel one needs to ensure that the water level is above the area where the water pump is, to ensure the pump is primed. About 3 inches above where the lower unit connects to the rest of the motor, should do it. Lastly, on that model, when you first start up the motor (when it is in the water), there is an almost unnoticeable mist of water from the exhaust hole. Without putting your hand under it you probably will not see this mist. It takes about 10 to 15 seconds for the t-stat to start to open before a good spray can be seen coming out of the relief hole.

 

[OptsyEagle]

Re: 1976 15hp evinrude not pumping water.

take a look at this photo. i held my garden hose up the the water exhaust port to see if i could get water through the system. i did but water wasnt coming just out of the pipe. a lot of water was coming from around the pipe as well. is this bad?
http://i.imgur.com/rBzf7.jpg

I took this from your other post on this site. If all you did was hold a garden hose in the water exhaust port to see what happens, you will never get it to come out that copper tube, that way. Since the exhaust port is not seeled up the water should just fall down the exhaust channel. If you can seel up the hose to the copper tube, water should come out the larger area just to the left of that tube in your picture (if the motor was connected you would see it then come out the water exit holes at the bottom of the motor, and the propeller). This would tell you that the channel between the bottom of the tube and the exit section are not clogged up. Since the t-stat will be closed, you cannot say it is getting around the cylinders, but since your problem was visual (not seeing water) that is probably not a concern.

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

I am not sure that my model has a thermostat. The model is 15655r. I rescued this motor from a rotting shed it had been in for 6+ years. I had another thread on here where you guys helped me get the ignition system working. I ran the motor for maybe ten seconds at a time but no longer than that for fear of burning it up. I connected my garden hose to the copper pipe pictured here. http://i.imgur.com/rBzf7.jpg
you can hear water go into the motor for a bit and then all water flow just stops. a few drops leak back down the copper pipe but thats it. I also connected the garden hose to the pee hole in the back and got water coming back down from the exhaust(i think).

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

I got a smaller diameter pipe and connected the hose that way. it was full water pressure going into the copper pipe and then the water would just stop.

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

i made this post late last night. its not quite what i meant to say.

I took this from your other post on this site. If all you did was hold a garden hose in the water exhaust port to see what happens, you will never get it to come out that copper tube, that way. Since the exhaust port is not seeled up the water should just fall down the exhaust channel. If you can seel up the hose to the copper tube, water should come out the larger area just to the left of that tube in your picture (if the motor was connected you would see it then come out the water exit holes at the bottom of the motor, and the propeller). This would tell you that the channel between the bottom of the tube and the exit section are not clogged up. Since the t-stat will be closed, you cannot say it is getting around the cylinders, but since your problem was visual (not seeing water) that is probably not a concern.

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

well i just looked at a parts diagram on the evinrude website for my motor and there sure is a thermostat. maybe i just need to slap it all back together and let it run for a bit. how long can i run it safely? I really dont want to burn it up. also, how much water should come out the pee hole in the back?

 

[2manband]

Re: 1976 15hp evinrude not pumping water.

A quick and dirty test is to just touch a fingertip or two against the cylinder head while the engine's warming up (carefully! watch for moving parts) If it gets too hot to keep them there for more than about 10 seconds, then it's too hot and you need to shut it down.

If working properly, the cylinder head will heat up to about that point, and then the thermostat will open, and it won't really get any hotter than that.

That's a pretty subjective test though - not everybody's fingertip thermometer is the same. You can use an infared thermometer to get a more accurate reading, and I'm sure that somebody here can comment on the correct temp range.

 

[OptsyEagle]

Re: 1976 15hp evinrude not pumping water.

Well, I would think that if water was connected to that water tube it should not stop, even when the T-stat is closed, so it sounds like something is plugging the channel. Most likely at the upper water tube grommet but one cannot be sure. Wish I could tell you more. 10 seconds is a little quick although mine does put out an invisible mist right away (noticed by putting hand under exhaust hole) and then a more visible spray in about 10 to 15 seconds. It has to be submerged in water to get any water out the exhaust hole. If you use muffs I don't think it will always spray water out that hole, but of course you should see plenty down below near the propeller and water exit holes.

I would let it go 30 seconds and keep touching the cylinder head where the plugs go in. It will be quite hot but still barely touchable. I would say normal is touchable for about 3 seconds. If it is untouchable, then shut it down and I suppose the next step would be to pull that powerhead and look at the upper grommet. Maybe others have some thoughts.

One last thing. You probably should never turn the garden hose full out. These motors are designed to expect fairly low water pressure and your home may put out considerably higher pressures then that. 10 psi will get water through that motor, if it will go through, and once the water gets to a working impeller it can provide all the needed pressure after that. Some homes put out 60 psi or more. That may be too much for some of the seals in there.

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

where can i find a good a good set of instructions or at least a general direction as to how to remove the power head? Should i buy anything in preparation?

 

[Logo09]

Re: 1976 15hp evinrude not pumping water.

The motor is pumping water. Turns out i just wasnt patient enough with it. I am going to post a video of it running tomorrow. Thank you guys for all your help.

 

[gozierdt]

Re: 1976 15hp evinrude not pumping water.

Good to hear your motor's running. If you want the best source of information on these small
Johnsonrude motors, go to:

http://www.leeroysramblings.com/#12_OB

fabulous source of information