Johnson sea-horse 3hp (1964) JH-19A

[opius]

Hi,

I'm having some problems getting this old engine to run properly.
It only starts when I put it on "fast" speed. And then it runs for a few seconds and when it tends to die. It helps pulling out the chocke and push it back in instantly.

I also got it to run with the chocke "halfway" for a good 10 minutes or so at the lake, right now I run it in a barrel again.

I have cleaned the carburator twice, but I have no idea on how to tune this carburator.
It doesn't have a high-speed needle at front which I find on all diagrams.
And the low adjustment on the front doesn't seem to change anything..

The fuel-line is made of copper and is leaking when I open it up. Could this be my problem?

I also pulled pretty much the entire motor apart and cleaned it.
The gaskets where a bit dry aswell :/

I'm thinking of buying some sort of kit for it. Only one problem,
I live in Sweden and parts are really hard to get.

Any ideas are apperciated, I can't really afford to get a new engine.

Best regards

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

Set slow speed at 1 1/2 turn, the high speed is already set .

I don't think the leaking fuel line is the problem, the engine should still get enough fuel to run on. On almost all my motors the copper fuel line is leaking too, but I haven't got any problems with it yet.

I live in the Netherlands, so I have the same ''parts'' problem .

Maybe this is a good link for you: http://www.marineengine.com/parts/v...ntage-evinrude-johnson/380044/38004400001.htm

Good luck and keep us posted

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Set slow speed at 1 1/2 turn, the high speed is already set .

I don't think the leaking fuel line is the problem, the engine should still get enough fuel to run on. On almost all my motors the copper fuel line is leaking too, but I haven't got any problems with it yet.

I live in the Netherlands, so I have the same ''parts'' problem .

Maybe this is a good link for you: http://www.marineengine.com/parts/v...ntage-evinrude-johnson/380044/38004400001.htm

Good luck and keep us posted

Thanks for the link!
Atleast now I can see how everything is supposed to be assembled

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

How is the compression, is it ok?
Pull the carb again and clean out and check both needles (high and slow speed) and passages of any dirt.

The problem is the carb, the engine doesn't get enough fuel, that's the reason why it only stays running when you set the choke ''halfway''.

These two links may help too:
http://www.outboard-boat-motor-repair.com/Evinrude 3 HP Lightwin Outboard Boat Motor/default.htm

http://www.maxrules.com/fixtuneitup.html

Good luck !

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

I think the compression is ok.

How can I check that?
This is the first engine I ever tried to fix.

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

I guess you don't have a compression tester...
Do you have other 2 cycle engines, like a chainsaw or something?
If you pull the cord slowly you can feel the compression... after you pulled about 10 cm of the cord it is hard to pull it over, then it is easy again, after another 10 cm it's hard again and then it's easy again etc.

If you can pull the cord on your Johnson really easy, the compression is low. If it shows some resistance when pulling the cord, then your compression is probably good enough to run.

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Ahh, well the cord has a substantial amount of resistance when pulled.
Tried the chainsaw, felt pretty much the same resistance there.

So I guess it should be ok.

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

Yeah, I didn't know a better way to explain how to test compression without a compression tester for somebody who never fixed an engine before, but I'm glad you understood my reply .
I think the compression is good to go

Try to pull the carb again and clean out all passages and needles.

Maybe this helps (Mercury carb cleaning, it's basically the same as how it works on an Evinrude/Johnson): http://www.youtube.com/watch?v=Y_xFQwtvtj8

 

[lindy46]

Re: Johnson sea-horse 3hp (1964) JH-19A

Try to pull the carb again and clean out all passages and needles.

And make sure to remove the welch plug on top of the carb and thoroughly clean the passages underneath. Use a thin wire to make sure they are open.

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

Maybe you can post photo's of the carb when you've taken it apart, so we can help you better .

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

How do you remove the welch plug? It's stuck..
There's really nothing to grip.

I also emptied the tank of fuel, but it was almost just dripping into my bottle..
0.5 liter took about 1-2 minutes.

It feels a bit slow?

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Damn, i managed to destroy the welch plug .. tried knocking it out carefully with a hammer and screwdriver.. but it was to soft so now there's a hole in it

 

[kethomps]

Re: Johnson sea-horse 3hp (1964) JH-19A

Those plugs aren't meant to be replaced. A carb rebuild kit will have one in it. You have to destroy them to get them out.

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

That explain things. but I'll try to restore the one I have, because otherwise I'll have to wait a few weeks on the shipment.

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Anyone know the size of that plug?

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Doesn't look like much, but I actually found a sheet of brass in my house, so I cut out a welch plug. It actually fit pretty tight, and I'm gonna seal it.

 

[opius]

Re: Johnson sea-horse 3hp (1964) JH-19A

Progress!

Cleaned the carb again, and sealed the welch plug.

Now it runs a bit longer than before. still died after like 30 seconds.
But it ran without the choke..

I still suspect the fuel-line .. It's constantly dripping, even with the valve shut off.

 

[JohnRudeMan]

Re: Johnson sea-horse 3hp (1964) JH-19A

Good start Opius! keep us posted on the progress !

 

[nwcove]

Re: Johnson sea-horse 3hp (1964) JH-19A

id also look into a couple of other things fuel delivery related . first you mentioned that it took a few minutes to get 500ml of fuel out of the line? .....sounds like the scintered metal filter in the tank is partially plugged, second....i notice in the first pic of the carb, it still has the old cork gasket ( located in the center of the float in that pic). when you set the float bowl onto the carb body, that gasket should keep it from mating until you snug the screws down.....if it doesnt, that could be another issue and need to be replaced.