1964 Johnson 75 hp leaking water and overheating

L

lookupsayaw

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Mar 9, 2011
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Okay so the other day I got my motor running (not well). I think it may be only running on 1-2 cylinders, is that even possible? The other thing is that I replaced my impeller and when I hooked the water hose to the fitting and turn the water on it is just leaking water all over. I turned the motor on and it started to overheat on the starboard side.
I did put the lower unit in a bucket of water(water level was just below the hole on the impeller housing) Dumb question. Does that part have to be below water?
 
oldcatamount

oldcatamount

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1,740
Re: 1964 Johnson 75 hp leaking water and overheating

Yes it's possible for your motor to run on 1 or 2 cylinders (at idle). You probably need to tune it with new points, plugs, condensers. When you run your motor in a bucket, the water level needs to be at least over the cavitiation plate (at a bare minimum). What "fitting" are you hooking the hose to?
 
L

lookupsayaw

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Mar 9, 2011
Messages
45
Re: 1964 Johnson 75 hp leaking water and overheating

I changed the plugs , I ordered plug wires and should get them within a week or so. Im not sure what the fitting is called but it is on the gearcase. On the water intake bypass cover plate there is a garden hose fitting. But when I turn the water on its just leaking im pretty sure out of the copper tube
 
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