In the winter, due to the low outside temperature, especially in the northeast and northwest regions, the outdoor temperature of minus 30 degrees, the Diesel Engine often encounters difficulties in starting up, or it is easy to turn off after starting, which adds burden to transportation efficiency. If it is blocked by heavy snow on the road, it is even called the sky should not be called the ground is not working, usually can only wait for the temperature to rise slowly, how to properly deal with the difficult situation of winter start?
Starting condition oil selection
If you want to know why you must first know why it is difficult to start the diesel engine in winter, we must first understand the basic conditions for starting the diesel engine: the atomized diesel injected into the cylinder and the compressed air with higher temperature and pressure. Mix quickly and burn. Therefore, the higher temperature, pressure and well-sprayed diesel in the cylinder are essential for the normal start-up of the diesel engine.
In winter, as the ambient temperature decreases, the viscosity of the engine lubricating oil becomes larger, the resistance between the friction members increases, the starting speed of the engine decreases, and the pressure at the time of compression of the engine cylinder does not reach the pressure at the start, and the cylinder The temperature of the compressed air inside is also significantly lower than the temperature required at startup, which makes starting difficult. At the same time, due to the decrease of temperature, the viscosity of diesel oil increases, the quality of injection atomization deteriorates, and the ignition lag period is prolonged; the decrease of temperature also causes the decline of battery working capacity, affecting the starting torque of the starter, resulting in the diesel engine starting system. The power is reduced, which increases the difficulty of starting. Therefore, effectively solve the above problems, and the difficulty of starting will be solved.
Countermeasure 1: Select a low-temperature fluid oil
Reasonable selection of diesel engine oil is the key to ensure the normal start of diesel engine in winter. During the winter, the driver should check the engine's lubricating oil and confirm the viscosity level of the lubricating oil according to the outdoor minimum ambient temperature. In the winter, if the oil with higher viscosity is used, it will add extra loss to the starter motor, battery, etc., and increase the fuel consumption due to the increase of internal resistance.
In the cold winter, you should choose 5W-30 or 10W-40 oil. Generally, the smaller the number in front of W, the better the fluidity of the oil, and the 5W can be used at minus 30 degrees Celsius, 10W can be minus 25 degrees Celsius, low temperature. Good fluidity of the engine ensures normal operation of the engine during cold start. As the lubricating fluid in the engine, the use of oil is directly related to the lubrication effect between the components, in addition to changing the viscosity of the oil according to the ambient temperature used. Also be sure to choose the oil products of the regular sales channel, do not rush to buy cheap engine oil, so as not to cause more serious damage to the engine.
Countermeasure 2: High-grade diesel is indispensable
The choice of winter diesel markings directly affects the normal start-up of diesel engines. When selecting the diesel fuel number, the appropriate oil is selected mainly according to the ambient temperature of the place of use. Generally speaking, low temperature and low diesel fuel with low freezing point are used. If the temperature is lower than the diesel fuel used, the diesel wax will appear. Blocking the oil circuit will affect the normal operation of the engine.
At present, domestically applied diesel fuel is divided into six numbers according to the condensation point: 5, 0, -10, -20, -35 and -50 diesel. Since the temperature of the cold filter point is 6-7 degrees higher than the condensation point, generally No. 5 diesel is suitable for use when the temperature is above 8 degrees; No. 0 diesel is suitable for use when the temperature is 8-4 degrees; Used when the temperature is 4-5 degrees Celsius; -20 diesel is suitable for use when the temperature is between -5 and -14 degrees. By analogy, the lower the temperature of the larger diesel fuel is applicable, so in the winter, especially in the area where the temperature in the lower part of the north is relatively low, the first step is to select the appropriate corresponding label for the diesel wax or solidification. Diesel. No additional equipment is required and no damage is caused to the vehicle.
In order to save costs, many drivers often use some soil methods to prevent diesel waxing. The most used one is to add a certain proportion of gasoline to diesel, which is very easy to damage the vehicle. Because the ignition points of the two oils are different, the ignition point of the diesel oil is 260 degrees. It can be burned through the high pressure and high temperature in the combustion chamber, and the ignition point of the gasoline is 427 degrees. It must be sparked by the spark plug to ignite. If the proportion of addition is too large, the vehicle will be difficult to start first, and it will take several times to catch fire. Secondly, when the vehicle is running, the combustion is seriously deteriorated, some fuels cannot be fully burned, fuel consumption is significantly increased, horsepower is decreased, exhaust pollution is sharply increased, and long-term use is mixed. Mixed fuel, increased carbon deposits in the engine, engine life will be greatly affected.
Countermeasure 3: Improve the low temperature starting performance of the battery
The function of the battery is to provide power to the engine when the engine is started. The optimal operating temperature of the battery is 20-40 ° C, the density of the battery electrolyte is normal between 1.26-1.28 mg / l, and the temperature is low and it is easy to freeze. As the ambient temperature decreases, its output capacity also decreases, resulting in a decrease in power to the startup system. Insulation of the battery can improve the low-temperature starting performance of the battery, and the battery is wrapped with felt and firmly placed in the battery box, which can increase the capacity of the battery and prolong the service life of the battery. Not only that, but also to maintain the battery, measure the specific gravity of the electrolyte, remove dust and oxides in time, so that the battery line and battery posts are installed firmly to increase the current when the diesel engine starts.
Countermeasure 4: Reasonable use of new and old equipment
Avoid using old and old equipment in the winter and try to use good performance equipment. Due to the long service life of the old and old equipment, the gap between the piston ring and the cylinder wall becomes larger, the cylinder sealing performance is poor, the gas leakage is much more at the start, the pressure of the compressed air is reduced, and the compression ratio in the cylinder liner is not up to At the same time, the diesel can't burn in the cylinder, causing blue smoke when starting the car, and the car can't get up, causing difficulty in starting.
For the problem of getting started, many experienced drivers are also a matter of opinion. Some methods are indeed worthy of adoption. However, in the face of individual specific methods, many informal methods not only make the problem difficult to solve, but also add extra for the car. The burden. Through several solutions for our inventory, I hope that we can provide practical help for everyone.
Concerned about surprises
Label: Truck Winter Maintenance Precautions
Previous: What are the methods for cooling tower maintenance? Next: The difference between centrifugal oil filter and ordinary oil filter
Oil Drilling Machinery, Oil Drilling Hydraulic Elevator, Oil Drilling Tools, Oil Equipment
Rugao Yaou Import & Export Trade Co., Ltd , https://www.ntyaoumachinery.com