The prerequisite for the normal operation of the diesel engine is that well-atomized diesel can be accurately and timely injected into the combustion chamber, and the compressed air in the combustion chamber must reach a sufficient temperature to catch fire and explode. To meet these two conditions, it is necessary to have a sufficiently high rotational speed at the start of the diesel engine and a certain temperature within the cylinder. When the diesel engine cannot start, it should look for reasons from the starting work, diesel fuel supply system and compression. The reasons for the starting work are: (1) The ambient temperature is too low. In the case of low temperatures, the preheating of the diesel engine should be well done, otherwise it is not easy to start. (2) The starting speed is low. For cranked diesel engines, the speed should be gradually increased, and then the pressure relief lever should be moved to the non-decompression position so that there is normal compression in the cylinder. If the decompression mechanism is improperly adjusted or the valve is against the piston, it will often feel that it is very laborious. It is characterized by the fact that the crankshaft can be turned to a certain position but it can be returned. At this time, in addition to checking the decompression mechanism, it should also check whether the timing gear meshing relationship is wrong. For a diesel engine using an electric starter, if the starting speed is extremely slow, most of the starter is powerless. This does not mean that the diesel engine itself has a fault. A detailed inspection of the electrical circuit should be carried out to determine whether the battery is fully charged, whether the connection of the wires is tight and whether the starter is working properly. The reasons for the fuel supply system are: (1) There is no oil in the tank or you forget to turn on the tank switch. (2) Excessive air or water in the fuel supply system. The phenomenon is that the starting speed is not low but it does not catch fire and the exhaust pipe emits white smoke. The check method is to loosen the bleed screw on the diesel filter or the high pressure tubing on the high pressure pump. If there is air coming out, there is air. The method of elimination is to tighten the connections of the oil circuit, then loosen the bleeder screw on the high pressure pump, turn the crankshaft, and remove the air. Water found in diesel can also be eliminated in the same way. If there is too much moisture in the diesel, you need to replace the diesel. (3) Plugged pipe or filter. The method is to use a gas cylinder to blow the pipeline, clean the filter, and check the fuel tank filler screen is intact. (4) The plunger of the fuel injection pump is worn, and the plunger should be replaced at this time. (5) The fuel pump outlet valve is stuck or the oil valve spring is broken. The high-pressure fuel pipe connector can be removed, and the outlet valve and the valve seat can be taken out and cleaned. When the outlet valve spring is broken, it needs to be replaced. (6) The injection pump plunger spring breaks, causing the injection pump to have no pressure. (7) The injection pump plunger is stuck in the plunger sleeve. When the oil circuit is normal, the plunger does not move when the crankshaft is cranked, indicating that the plunger is stuck with the plunger sleeve. The injection pump should be disassembled and the plunger and plunger sleeve cleaned. (8) injector needle stuck. The injector should be removed and the needle valve removed from the injector to clean or replace the needle valve assembly. (9) The fuel injection time is incorrect, and the injection time should be corrected according to the regulations.
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