Diesel engines are an important part of diesel generator sets. Many operators of diesel generator sets, including many operators, have some misunderstandings and incorrect understandings in the daily use of diesel engines. These misunderstandings not only affect the power and economy of the engine ,

And it has become the inducing factor of some major problems, and even directly affects the service life of diesel generator components and the entire unit. These common misunderstandings are mainly manifested in:

1. The generator set feels that the fuel supply advance angle should be earlier

Some mobile power station operators often prefer to move forward a little bit when adjusting the fuel supply advance angle of diesel engines, and some even exceed the specified value by 2-3 degrees. They feel that if the fuel supply advance angle is adjusted forward, the engine will work vigorously. But they don’t know that the premature fuel supply advance angle is equally harmful to the diesel engine’s work and the lag. The reason is simple. First, the high burst pressure makes the high-temperature gas easily escape into the lower crankcase, causing high-temperature fission of the engine oil. , The engine oil is also easy to evaporate into oil vapor, causing the crankcase to catch fire. Second, the rapid combustion of excess fuel in the cylinder will increase the thermal load on the piston crown and cause overheating and damage to the piston. Third, the increased vibration of the cylinder liner will accelerate the corrosion of the cylinder liner and the body, which will eventually lead to damage to the diesel generator set. Fourth, it will cause knocking, increase the momentum of the piston on the cylinder liner, increase the vibration of the cylinder liner, and cause fatigue damage to the cylinder liner. Fifth, the premature fuel supply advance angle causes too much fuel accumulated in the cylinder before the top dead center, and the burst pressure after combustion increases a lot, which will increase the mechanical load of the piston connecting rod and cause damage to these parts. Sixth, excessive heat load will cause cracks in the cylinder head and deformation of the valve seat sealing ring. The final result of these failures will cause damage to the diesel generator set and shorten the service life of the diesel generator set.

2. The generator set feels that more oil should be added

When the oil in the diesel engine case is small, it will be emptied, and the oil pressure will drop. The direct consequence is that the oil can’t reach the lubrication surface of various parts, accelerating the wear of the parts, and eventually leading to accidents of the diesel generator set. Therefore, some drivers I like to add a little more engine oil at one time, exceeding the specified scale, so that I can get it done once and for all. The idea is good, but the actual situation is just a matter of course. You must know that too much oil will cause many undesirable results: first, too much oil will easily leak out before and after the crankshaft, increasing oil loss and pollution. The environment has increased the difficulty of maintenance; second, too high oil level will hinder the movement of the connecting rod, increase the movement resistance of the parts, and reduce mechanical efficiency; third, too much oil will easily cause the oil to flow into the combustion chamber and increase the loss of oil. Moreover, after the oil is extinguished, it is easy to form carbon deposits on the piston ring, the valve seat at the top of the piston, and the fuel injection nozzle, causing the piston ring to seize, the fuel injection nozzle wall plug and other problems; the fourth is the excessive oil level under the agitation of the connecting rod. It is easy to produce oil and vapor, and it will catch fire when exposed to high temperature, causing an explosion accident of the crankcase.