The reasons why there is no high voltage spark in the EFI engine are: 1. Fuel system reasons: the low pressure oil line is blocked, the pipeline is loose and is leaking, there is air in the high pressure. -oil pipe under pressure, the technical condition of the fuel injector is not good and the injection timing angle is incorrect 2. Starting device reasons: power failure, poor ignition contact the electromagnetic switch, poor contact between the collector; of the starter and brush, clutch slippage of the starter transmission mechanism; 3. Insufficient cylinder compression pressure: damaged cylinder seal, air leak, valve closing failure. Significant air leakage, wear and leakage of the piston cylinder liner. 4. Insufficient air intake: The air filter element is clogged.
What is the reason why the gendiesel generator cannot start?
The reasons why the diesel generator cannot start or is difficult to start:
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①. There is no explosion sound in the cylinder, but white smoke comes from the exhaust pipe;
②.
Practice has proven that to ensure the smooth start of the diesel generator, the following four necessary conditions must be met: a. Oil and gas lines must be; smooth ; C. Cylinder compression is good;d. From the above prerequisites for starting a diesel generator, we can deduce the reasons why the diesel generator cannot start or is difficult to start.
(2) Cause of failure
①. Diesel engine speed is low a. The starting speed is too low. b. The pressure reducing device is not placed correctly; position then incorrectly adjusted; vs. The valve is incorrectly adjusted.
②. THEoil and gas pipes are not smooth; has. There is no oil in the fuel tank, the oil pipeline is blocked, the fuel filter element is blocked, and the oil switch is not turned on. ; b. When the diesel engine starts, the ambient temperature is too low; vs. There is moisture or air in the oil circuit; d. The air filter element is poorly atomized; clogged or dirty.
③. Cylinder compression is not good; has. The matching gap between the piston and the cylinder wall is too large; b. The piston ring is broken or the elasticity is too small; the exhaust valves are not closed properly
④. Poor fuel supply; has. The fuel injection time is too early (it is easy to block the fuel injection pump) or too late. b. on time.
(3) Inspection method? Before inspection, you must carefully observe the fault phenomenon, see the essence of thefault and compress it gradually to achieve the troubleshooting goal. For diesel engine generator starting failure or starting difficulty, it is usually judged and verified based on several different fault phenomena.
①. Diesel engine speed is too low. For diesel engines using electric start, if the starting speed is extremely slow, this fault is mainly due to the inability of the starter, which does not mean that the diesel engine itself is faulty. You need to check the starting circuit to determine if. the battery has enough power and the wires are tight. Check if the starter (starter) is working well and if the air filter is blocked.
②. The starting speed is normal, but it cannot catch fire. There is no explosion sound from the cylinder, or there is an intermittent explosion sound and white smoke comes from the exhaust pipe.catchment. Through this phenomenon, it means that the diesel is not burned in the body and turns into vapor and is discharged, or there is too much water in the diesel.
First check the diesel generator when startingCheck if the ambient temperature is too low, then check if there is air or moisture in the oil circuit. The oil pipe joints of the diesel engine power system are not fixed well, the fuel injector needle is stuck, and the diesel in the fuel tank has been exhausted before shutdown, etc., which can cause air to enter the diesel engine's fuel system. In this way, when the fuel injector piston is inserted when the oil is filled, the air entering the oil circuit is compressed and the oil pressure cannot increase when the fuel injector piston injector is filled. oil, the air volume expands and affects the suction of the oil. Consequently,the oil supply volume suddenly increases and sometimes decreases. The inspection method for such defects is to loosen the diesel filter bleed screw, fuel injection pump dropout screw or fuel injection pump high pressure oil pipe, and running the diesel engine. If bubbles appear, bubbles appear. indicates that the diesel engine fuel system is defective. If there is air inside, the solution is to tighten the oil line seals, then loosen the fuel injection pump release screw, rotate the crankshaft until until there are no more bubbles in the oil. , then start the engine after tightening the bleed screw. If moisture is detected in the diesel, you can also check it with the same method, check the reason for the moisture in the diesel and replace the diesel in the fuel tank if necessary.ire.
If there is no mixture of air and moisture in the diesel, you should continue to check whether the injector performance is good and whether the fuel supply and gas delivery times are appropriate.
③. The cranking speed is normal and the cylinder compression is good, but there is no fire or smoke. This is mainly because the low pressure oil circuit is not supplying oil at this time. mainly follows the oil circuit, fuel tank and diesel filter, oil transfer pump and fuel injection pump, etc., the fault location can usually be found.
Poor diesel filtration or not replacing the diesel filter regularly are the main causes of low pressure oil lines and diesel filters. To determine if the oil lines or diesel filters are clogged, you can connect the filter todiesel. to the fuel injection pump. Remove the oil pipe. If there is a lot of oil in the tank but a lot or no oil is leaking from the diesel filter, it means the diesel filter is clogged. If the low pressure oil circuit provides good oil, the reason for the diesel engine without high pressure oil is mainly because the piston coupling of the fuel injection pump is worn or poorly assembled.
④. The starting speed is normal and the sound of fuel injection can be heard, but it cannot start. This is mainly due to poor cylinder compression.
For a diesel engine equipped with a decompression mechanism, if the decompression mechanism is in the non-decompression position and you can still rotate the diesel engine gently with a crank and feel little resistance , you can conclude that the cylinder is leaking.
After a penny leakintake pope or exhaust valve, the cylinder compression temperature and pressure are not high, and the diesel is not easy to burn. The main reason for this type of leak is valve clearance. is too small. The valve is not closed properly. On the other hand, if there are carbon deposits and other debris on the bee cone or valve seat, the valve will not close tightly. During the inspection, you can rotate the crankshaft. If you hear a "squealing" sound from the air filter and exhaust pipe, it means there is an air leak in the cylinder.
When rotating the crankshaft, if there is a sound of air leaking at the joint surface of the cylinder head and cylinder block, it means that there is a air leak in cylinder seal. The cylinder head nut may not be tightened or loose, or the cylinder gasket may be broken.
When you turn the crankshaftn, there is a sound of air leaking inside the body or at the oil filler port. There are several reasons.On the piston ring, in order to find out whether the insufficient pressure in the cylinder is caused by a bad piston ring, a small amount of lubricating oil can be added to the cylinder if the compression force in the cylinder obviously increases after adding the engine. oil, the wear of the piston surface is excessive, making the fit gap between the cylinder and the piston ring too large and air seeps into the crankcase between the piston ring and the cylinder liner.
If the compression force does not change much after adding engine oil, it indicates that the insufficient compression force in the cylinder has nothing to do with the piston. Air may be escaping through the intake valve or exhaust. valve.
The reasons why the generator diesel does not catch fire: 1. The friction surface is not lubricated in time. 2. The lubricating oil film on the cylinder wall is damaged. 3. Corroded by acidic substances.
1. The friction surface is not lubricated in time. During a cold start, the oil pump cannot immediately pump lubricating oil to each friction surface. Deterioration of initial lubrication conditions;
2. The lubricating oil film on the cylinder wall is damaged. Due to the low temperature, it is difficult for gasoline to atomize, and some of the unatomized fuel enters the cylinder in a liquid state, eliminating the oil film remaining on the cylinder wall, aggravating the lubrication conditions between the cylinder wall and the piston ring, which leads to a sharp increase in wear. This condition exists in varying degrees until the engine reaches normal temperature. Consequentlyt, the practice of “slamming” the accelerator after a cold start is very harmful and must be resolutely corrected.
3. Corroded by acidic substances. Before the engine reaches normal operating temperature, the sulfide produced by gasoline combustion combines with water vapor condensed on the cylinder to form acidic substances, corroding the cylinder wall and rings. piston and accelerating wear. The lower the engine operating temperature, the greater the wear.
It is difficult to preheat part of the transmission. Its normal temperature is often guaranteed by the friction between the parts and the heat generated by the brewing oil, and the temperature rises slowly. At this point, the gears and bearings are not fully lubricated, increasing their wear. At low temperatures, the engine cylinder and intake pipe are filled with cold air, the speedstarting is slow, heat dissipation is large, and gasoline cannot be completely vaporized and burned, which not only increases fuel consumption, but also reduces engine power. .