Moisture in cylinder?

Rushpump

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Apr 27, 2004
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1980 Evinrude 70HP, 3 cylinder. Evidence of fine water droplets in the center cylinder. Compression of all three cylinders is 125 psi, each within 2 or 3 psi of each other. The spark plugs on top and bottom cylinder have just a light film of clean oil or gas and oil. The middle cylinder plug has a white cloudy film on it, which I am assuming is a mist of water. That cylinder fires but not consistently. First reaction was head gasket or cracked cyl. head. But if so how could compression be equal. Where else could water come from? Where do I go from here?
 

bassin51

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Feb 19, 2003
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Re: Moisture in cylinder?

This same thing happened to me on my 115hp Johnson. I replaced the head gasket, no help. Later found a hairline crack in the cylinder. Seems like it will have good compression reading, but when it gets hot, the crack will expand, and that was where I was getting the water..
 

Rushpump

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Apr 27, 2004
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Re: Moisture in cylinder?

Thanks, Bassin51, for the info, but that surely isn't a very bright picture. Changing the head gasket is a pain. Changing the head is a real headache, but throwing out the engine is easy but financially super painful. I guess we'll remove the head to find out. Thanks again.
 

fgwebb

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Jun 20, 2004
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Re: Moisture in cylinder?

I have a 1996 115 with the same problem on cyl #4.<br />What did you end up finding was the problem in your case?<br /><br />thanks
 
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