1, low-temperature start Usually the engine can start at a temperature minimum start-up speed to indicate the start-up performance at this temperature, and the lowest temperature engine start-up that its low-temperature start-up performance. Startup performance and engine type, combustion chamber design, technology level. In use, the low-temperature start-up of the engine is mainly affected by the viscosity of the engine oil, the evaporation of gasoline or diesel, the low temperature fluidity of diesel and the battery capacity. The engine crankshaft rotational resistance torque and starting speed are mainly affected by the viscosity of lubricating oil under low temperature conditions. As the temperature drops, the internal friction of the oil increases, the engine torque increases, and the power required to start the engine increases. The impact of fuel on engine starting performance is mainly its evaporation. As the temperature decreases, the viscosity and relative density of gasoline increase; under low temperature diesel fluidity decreases, the viscosity increases, causing poor diesel atomization, the combustion process deteriorates. After the temperature is further reduced, the fluidity of the fuel will gradually be lost due to precipitation of the waxy deposits of the fuel. If diesel oil contains moisture, the winter may also cause the supply system to freeze and become inoperable. Therefore, diesel must be precipitated and filtered before use. After entering the autumn, should carry on the maintenance and the maintenance to the battery and the starting machine, removes the oxide on each connecting line, tightens the bolt of each connecting line, make it combine firmly. In addition, the choice of the appropriate electrolyte density has a significant impact on the work of the battery, to strengthen the insulation work in winter or winter use of large-capacity battery, but also improve the engine starting performance of a measure. 2, low temperature wear In the engine life cycle, 50% of the cylinder wear occurs in the boot process, and low temperature start on the engine wear greater impact. Engine low temperature start-up, the cylinder wall wear serious reasons are: during startup, cylinder wall lubrication conditions are poor; cold start, most of the liquid fuel into the cylinder, scouring the cylinder wall oil film. In fact, the main problems with equipment used at low temperatures are the engine start-up difficulties and the assembly wear. In addition, there are problems such as mechanical damage, corrosion (cylinder wall, exhaust pipe, etc.), poor thermal condition of the assembly, and increased fuel and lubricant consumption.
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