The flow is from the thermostat housing through the water pump, the by-pass allows a small amount of hot return water to mix with the cooler water that the pump is drawing from the bottom of the radiator, as this water circulates it keeps the entire engine block at a more even temperature which increases efficiency, in other words, keeps the block and the heads at an even temperature instead of block cooler -- heads hotter. The reason the water will divert is because an engine water pump is not a positive displacement pump.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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