TM 5-4310-386-14Section IV. OPERATION UNDER UNUSUAL CONDITIONSParagraphPage2-14Operation in Extreme Cold ............................................................................................................2-152-15Operation in Extreme Heat............................................................................................................2-172-16Operation in Dusty or Sandy Areas ..............................................................................................2-172-17Operation in Rainy or High Humidity Conditions ...........................................................................2-172-18Operation in Salt Water Areas ......................................................................................................2-172-19Operation at High Altitudes ..........................................................................................................2-182-14. Operation in Extreme Cold.NOTEWhen operating the K-20-D in cold weather 32°F (0°C) or below, both the engine and compressorlubricating oils must be changed to cold weather oils.To ensure satisfactory cold starting, the choice of the viscosity grade should be governed by the ambient temperatureprevailing at the time of starting. As to the oil change intervals, it should be kept in mind that operation below 50°F(10°C) requires shorter oil change intervals.Use winter-grade fuel in winter because, with ordinary fuel, waxing may occur at low temperatures and clog the fuel filter.At excessively low temperatures, even winter-grade fuel may tend to wax. Therefore, if only summer-grade fuel isavailable, or if winter-grade fuel is used at excessively low temperatures, the following percentages are recommended(figure 2-6) for mixtures of diesel fuel and kerosene or regular-grade gasoline.Figure 2-6. Fuel Mixture by Temperature.2-15
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