Difficulties in starting
Improper operation. Its performance is: 1 when the throttle is too large or too early to give oil. Because the oil supply is too early and the fuel supply is too large, although the mixture gas is rich, it will cause more oil accumulation in the combustion chamber, lower the temperature of the combustion chamber, and is not flammable. 2 The temperature is low, the body is cool, the viscosity of the oil is large, and the resistance is large, which is not conducive to deflagration. 3 There is no break out after multiple start-ups, too much oil build-up in the combustion chamber, and low temperature of the mixture gas is not easy to catch fire. These operations will cause start-up difficulties.
The supply system is abnormal. Its performance is an abnormal fuel supply. 1 There is air and water in the oil circuit to block normal oil supply. 2 The cam of the high pressure oil pump is worn out and the injection time lags behind. 3 The oil valve and injector have been seriously worn out, resulting in insufficient oil supply, change of oil supply time and characteristics, or seizure. 4 Improper injection pressure, poor atomization or high oil speed. 5 Diesel grades are not compatible with the temperature, fuel stagnation, oil supply blocked, and poor atomization. 6 When the fuel tank switch is blocked, the coarse and fine diesel filters are clogged, the oil supply resistance is large, and the fuel supply is insufficient. 7 Use of inferior fuel, etc. These failures can cause start-up difficulties. The second is abnormal air supply. 1 The air filter is clogged, making the air supply insufficient and difficult to start. 2 The valve clearance was changed after improper valve clearance or severe valve wear. If the 3 intakes and exhaust pipes are blocked by dust and carbon deposits, the flow of intake and exhaust gases is blocked, which can cause difficulties in starting.
The combustion chamber is working abnormally. Its performance is: When the agricultural vehicle's engine wear is serious and other reasons cause the compression ratio is less than 20, or the average effective pressure in the cylinder is lower than 56.9 × 104Pa, the mixture will be difficult to start compression. The reasons for this failure are as follows: 1 When the intake or exhaust valve leaks or the valve seat sinks more than 2.5 mm, the compression ratio must be reduced significantly. 2 When the clearance between the piston skirt, piston ring and cylinder liner exceeds the limit value, the leakage volume will increase and the compression ratio will decrease significantly. When the connecting gap between the connecting rod journal and the tile exceeds the maximum allowable value, the super compression ratio will be caused. Too low. 3 Cylinder pads are ablative and leaking. 4 In the combustion chamber, too much carbon is accumulated, the volume is reduced, and the eddy current is blocked so that it is difficult to start. 5 valve spring breaks or lacks elasticity and leaks.
Exclusion methods and techniques
Start the operation correctly. 1 Whether in winter or summer, the crankshaft must be cranked for about 20 rounds before start-up. The standby oil can be started after reaching shaft bushes, etc., to reduce the resistance and reduce the wear; for newly used or overhauled, repaired and repaired lubrication systems, newly purchased or overhauled. After the agricultural vehicle is started, the crankshaft should be cranked for 100 to 200 cycles before starting. 2 The fuel supply at the time of start-up should be about two-thirds of the rated fuel supply. The idea of ​​attempting to obtain the start-up by increasing the fuel supply quantity is only counterproductive; the timing of fuel supply should be extremely high at the flywheel. Rotational speed is best when 1~2 seconds before depressurization.
Do a good job in seasonal maintenance. Based on the maintenance of the entire vehicle, we will focus on the maintenance of the engine, test and inspect the various systems and components such as oil pumps, fuel injectors, cylinders, pistons, intake and exhaust valves, etc., and repair or replace them with severe wear. The advance angle, valve timing, and valve clearance must be strictly adjusted to the standard state. The technique is: 1 to remove oil leaks can be used to replace the new pad method. 2 Open the bleeder plug to drain the gas. 3 Clean the coarse and fine filters, the tank switch, and the air filter. 4 Remove precipitated water. 5 Check whether the oil supply pressure reaches 12.25±0.5Mpa. If it does not meet the requirements, replace the plunger, injector, etc. to eliminate. If there is oil drip in the injector, replace the oil valve accessories. 6 Adjust the fuel advance angle to reach 17°~19°. 7 Adjust the clearance between intake and exhaust valves so that they actually reach 0.35mm and 0.4mm, respectively. 8 Check the scale and carbon deposits in the intake and exhaust pipes and muffler and clean them. 9 Check the cylinder pressure. If the cylinder pressure is lower than the cylinder pressure, check the airtightness of the valve, the amount of valve depression, and the clearance between the piston group and the piston ring and the cylinder. If necessary, grind the valve and cylinder liner and replace the piston and ring. Pad leak to change pad. 10 Remove carbon from the top of the piston and the combustion chamber. Replace broken and springy valve springs.
Anti-burning oil freezes. Commonly used diesel fuels have freezing points of 0°C and -10°C, respectively. Under normal circumstances, -10# diesel oil should be replaced from mid-November to the end of February of the following year. At the same time, the use of advanced lubrication oil, winter cold start resistance is mainly from the thick oil, the starting force can not overcome this resistance, so that the engine to start the speed and start. At present, each station has a high-grade engine oil for sale. These advanced engine oils contain many components such as antifriction agents. Compared with conventional bulk oils, they have good low-temperature fluidity, small starting resistance, and good lubricating effect, which can extend the service life of the components. Although the price is a bit expensive, Good deal.
Fuel Vehicle,Mini Gas Car,Miniature Gas Cars,Miniature Gas Powered Cars
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