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Re: Sick Tractor, Amongst Other Things

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arnold z

09-14-2013 05:46:17

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My theory on the "oil" found floating on top is that as the head gasket detereorates around the water ports between the cylinders,it dissolves and mixes with the coolant. It does appear to be oil, but if you skim some off and let it dry in the sun, it turns to a gritty substance as the coolant evaporates from it. What leads me to this conclusion is that I've never noticed it on one that had the all metal head gasket,only with the fiber type. Other than a black film in the radiator,it has never caused me a problem,but is a sign that you may be needing a head gasket sometime in the future. No matter how black your oil is, if it has much water in it, it will at least turn gray. In any case it would be much easier to get water in the oil with the assistance of compression/combustion/bad head gasket than the other way around.

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09-14-2013 06:37:55

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 Re: Sick Tractor, Amongst Other Things in reply to arnold z, 09-14-2013 05:46:17  
Quoting Removed, click Modern View to seeWhat is the logic/reasoning behind, " In any case it would be much easier to get water in the oil with the assistance of compression/combustion/bad head gasket than the other way around."?

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arnold z

09-14-2013 07:41:50

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 Re: Sick Tractor, Amongst Other Things in reply to JMOR, 09-14-2013 06:37:55  
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Pressurized oil never gets near the head gasket,or cylinders, but water does. If it gets in a cylinder it will wash past the rings and mix with your oil. If your rings are seriously worn, it will be even easier. what doesn't wash past the rings will most likely go out the exhaust. A small amount of oil might get pushed back into the cooling system. When the engine is warmed up, the coolant becomes pressurized,and continues to be pressurized after shutting off. The oil is just sitting,or lying there waiting for the pressure to send it some water. The only pressurized oil in the cylinder would be from bad rings, and would only be pressurized at combustion time. If it made it into the coolant while running, when you stopped the engine, the pressurized water would be getting back into the cylinders. If oil,thicker than water can get through a hole, thinner water under pressure will go back the other way easier.

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