1975 johnson 6hp water cooling

[Gradywhite3535]

I got my motor to start after fixing a few things and now i have water exiting this drain hole. Is there a chance the previous owner routed the water to come out this hole? I was told it should only come out of the water/exhause hole.

 

[F_R]

Re: 1975 johnson 6hp water cooling

Speaking of the blue dot??? That is not a drain hole, it is where the locating tabs on the water tube grommet go. Don't worry about the leak, doesn't mean a thing unless it is really pouring out, which could mean a badly damaged grommet. That could result in overheating because of the water leaking out instead of going up to the powerhead. A spray of exhaust & water comes out the blow hole in the rear but most of it goes out the underwater exhaust behind the propeller.

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

When the motor is running water shoots out that small hole pretty good. The water pump housing has a brand new grommet unless you are talking about the top of the water tube?how could I check if the water is circulating around the power head correctly?

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Anyone have exp with this motor? I don't understand why water is shooting out of this hole

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Here is a video of the motor running--- Aug 4, 2013 - YouTube

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Can anyone check out the video ^^^^^

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Here is the video http://youtu.be/Rn42RDADU-I
What could be making the water exit this hole

 

[Vic.S]

Re: 1975 johnson 6hp water cooling

I am surprised there is a hole there at all!

I dont beleive it is anything to do with the water tube grommets. Its not near either of them surely?
The lower grommet is the same part as in my later model and that just has little tabs that locate in the outlet of the water pump.

I dont understand why there is not more water coming out of the outlet on the back of the leg at about the same height.

I think I would check that the motor is not overheating. It should be possible to touch and maintain contact briefly with any part of the power head except perhaps the cylinder head close to the spark plugs.
If not overheating Id not be unduly worried.

I might check that the outlet on the back of the leg is not blocked. I might try blocking that hole on the side to see what happens.

Maybe merely a modification that someone has made for some reason ...... I wonder if its been modified to run in a well in a small sailboat with an over board outlet fitted there.

Why is it blue ? Is there something broken off in there ?

 

[Tim Frank]

Re: 1975 johnson 6hp water cooling

I agree with Vic.
I have the same motor and will check today whether mine has the "blue dot" and whether any water comes from there.
Also, it looks to me like the L/U should be deeper in the water.

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Thanks for the replays guys, its not really blue it just looks like that. When I got the motor it was filthy in the L/u. It was in salt water and ill show you a pic. Most of these engines do have a hole there but no water coming out of it. I replaced the water pump and tstat. I wonder if theres a clog somewhere or if they some how made a outlet there?

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

And also noticed that the water that is coming out the exhaust is really dirty. Idk if its oil or sand/grit. Here's a pic of that. Is there a way to shoot water thru the tstat to see where the water exits or thru the exhaust?

 

[Tim Frank]

Re: 1975 johnson 6hp water cooling

I agree with Vic.

I also agree with FR....but that is a given.
If the engine is getting sufficient cooling water, a minor leak is really of no consequence.
The first things that I would suspect is water building up inside the lower casing from a leak around that grommet... and simply running out of the "blue dot" with an assist from some exhaust gas....the stream is not all water....it is clearly "sputtering" which indicates (at least to me) that it is as much, or more, an exhaust leak as a water leak.

 

[Vic.S]

Re: 1975 johnson 6hp water cooling

Most of these engines do have a hole there

Fair enough. Mine is a later model.. it does not

it looks to me like the L/U should be deeper in the water.

true but its seems to be pumping water OK

And also noticed that the water that is coming out the exhaust is really dirty.

Yuk! Id expect a little unburt oil from the fuel but not that much.

Give it a good flush out with a few changes of the water. There maybe a load of oil in there still to flush out. You need to give it a good run to make sure its not over heating anyway.

Check your gear oil too in case that is leaking. Gear oil should be "clear and bright". If its milky looking or "milkshake" like or if you can see water in it you have some seals to replace

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

I checked the oil and it checked out good but was dark. I looked at a old video before i replaced water pump and i noticed that there was a lot of air exhaust coming out of the under water exhaust. But now theres no exhaust coming out from the under water exhaust. Idk what that could mean? Also i read that these motors starve for water because the prop thrust helps with water intake. I am so confuse at this point as to why water is coming out of that side hole. Can I somehow hook water up to the thermostat and see if the water exits the water outlet? And whats the best way of knowing of the motor is overheating? I mean it gets hot but idk what temp it is. The manual says to get a thermo stick. Please help. This is a video from about a month ago. Johnson 6hp running a few weeks ago - YouTube

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

I also used the 1979 water pump kit as i was told it was better to use. When I got my hands on the motor it also had the 1979 kit. When I checked in the little hole on the side it looked like a black piece of rubber. Has anyone heard of people rerouteing the water to come out the side?

 

[nwcove]

Re: 1975 johnson 6hp water cooling

are you 100% sure the water tube is seated in the pump??? and im surprised it pumps any water with it not being submerged even close to deep enough in that bucket.

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Yes it is connected and everyone i see with this motor has it at the same height

 

[Gradywhite3535]

Re: 1975 johnson 6hp water cooling

Why would water be coming out of this hole. Should I squirt some water they the tstat to see where the water exits? I know soneone out there knows whats going on. Please help me. Thanks

 

[Tim Frank]

Re: 1975 johnson 6hp water cooling

. The manual says to get a thermo stick. Please help. [/url]

So get a thermo stick......

 

[Mark3]

Re: 1975 johnson 6hp water cooling

The first reply was F_R stating "unless it is really pouring out, which could mean a badly damaged grommet." Based on the video (water spraying out the mention hole and only a few drops from the exhaust relief) I would trust his experience if it were my motor.