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Old 25-03-2021, 22:04   #1
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Mercury 6hp water in oil issue help

Disclaimer, I am not a mechanic and watch YouTube videos to try and figure things out.

So I recently received a 2013 Mercury 6hp MFS6CS outboard. It was briefly inspected by a local outboard shop and needed a new lower end. I was able to order a new lower end and I installed it.

Since then, the motor has only been started on a stand with the water flush hose attached. It ran fine without any issues. After several months I again started the motor on the stand. I ran it for several minutes before getting ready to change the oil. The engine stalled out after 2-3 minutes and I checked the oil and discovered it had water inside. I changed the oil and ran it again, for 2-3 minutes and again discovered water inside the oil.

My question is where is the water coming from. My first and only guess was a head gasket issue. After watching a video I removed the head. I did not notice anything that jumped out (see pictures). The gasket appeared in good condition.

So I am confused, and not sure how water is getting into oil. I donít see any cracks and the spark plug was dry. The top of the cylinder was lightly lubricated, without water. The lifters/push rods had the milky water/oil inside.

Any help would be helpful. I have ordered the new gaskets and plan to put back together unless someone knows another possible cause that I can inspect


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Old 26-03-2021, 05:17   #2
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Re: Mercury 6hp water in oil issue help

Hummmm. Two types of possibilities. One is any gasket that lies between the coolant passages and the valves/cylinder/crankcase, not just the head gasket. The other is a crack in a similar location. You are replacing the gaskets. A dye penetrant kit is not cheap, but may be the only way to make sure. Here are some examples:

https://www.amazon.com/dye-penetrant...+penetrant+kit

One area for suspicion is the connection of the new lower foot. That contains both the exhaust and the water, and you recently disturbed it.
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