Yes, I will comment. When tractors burned distilate, kerosene, and other low-grade fuels some of the fuel would pass unburnt past the piston rings and would over time dilute the crankcase oil. As the un-burnt fuel was lighter than the oil it would rise to the top over time when the tractor was not being used (ie at night) In the morning the farmer would open the bottom petcock and drain it down to that level. Then he would refill with new oil to the level of the top cock. This would keep most of the dilution to a minimum. The earlier models had 3 test cocks and the middle one was used as the drain-down.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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