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Introduction to common problems and incorrect usage of diesel generators

发表时间:2019-05-16 Article source : Couch motor manufacturersPost time: 2019-05-16

Diesel generators should be familiar to everyone. It is a very wide range of generators. Today I will talk to you about the topic of diesel generators. Many projects encounter many common faults when using diesel generators. What are the wrong ways to operate a diesel generator? Let ’s take a closer look at “introduction to common problems and incorrect usage of diesel generators”.



[Common faults of diesel generators]


或喷不出油 1, little or no fuel injection


(1) Air has penetrated into the oil circuit.


(2) The oil needle or oil needle body bites.


(3) The oil needle and the oil needle body are too loose.


(4) The fuel system has serious oil leakage.


(5) The fuel supply of the fuel injection pump is abnormal.


(6) Oil needle body and oil needle are rolled to death.


(1) Exclude air.


(2) Check, repair or replace.


(3) Replace the fuel injection nozzle parts.


(4) Check the joints of the oil circuit and tighten them, and replace them if necessary.


(5) Maintenance and adjustment


(6) Clean and repair.



压力低 2.Low fuel injection pressure


(1) The pressure regulating screw is loose.


(2) Deformation of the pressure regulating spring causes pressure to decrease.


(1) Adjust the fuel injection pressure to the specified value.


(2) Adjust or replace with a new spring.


太高 3.Injection pressure is too high


(1) The pressure of the pressure regulating spring is too large.


(2) The oil needle is stuck.


(3) Fuel injection is blocked.


(1) Adjust the pressure or replace the spring.


(2) Repair the fuel injection nozzle.


(3) Maintenance and cleaning.


4.Severe oil leakage from the injector


(1) The pressure regulating spring is broken.


(2) The seating surface of the needle body is damaged.


(3) The oil needle is bitten.


(4) Tighten the cap for a long time.


(5) The plane of the injector casing is worn out.


(1) Replace with a new spring.


(2) Replace the injector nozzle parts.


(3) Clean or replace the fuel injection nozzle parts.


(4) Replace.


(5) Grind the shell surface or replace it.


雾化不良 5. Poor atomization of the injector


(1) The needle body is deformed or worn.


(2) The seating surface of the needle body is worn or burned.


(1) Replace the injector nozzle parts.


(2) Replace the injector nozzle parts.


6.Injection into line


(1) Nozzle is blocked.


(2) Oil needle and oil needle body seat surface are worn excessively.


(3) The oil needle is bitten.


(1) Clean or replace.


(2) Replace the injector nozzle parts.


(3) Clean or replace.


7. Diesel engine overheating


The surface of the injector is burnt out or blue-black.


Overhaul the cooling system and replace the injector nozzle parts.


[What are the incorrect operation methods of diesel generators]


The incorrect operation of the diesel generator will seriously affect the service life of the diesel generator. Let ’s find out what are the incorrect operation methods of the diesel generator in daily life?


Misoperation of diesel generator 1: diesel engine runs when engine oil is insufficient


In this case, due to insufficient oil supply, the surface of each friction pair is insufficiently supplied with oil, resulting in abnormal wear or burns. For this reason, before the start of the diesel generator and during the operation of the diesel engine, ensure that the engine oil is sufficient to prevent cylinder failure and tile burning failure due to lack of oil.



Diesel generator wrong operation two: emergency shutdown with load or immediate shutdown after sudden load shedding


After the diesel generator is turned off, the circulation of the cooling system water is stopped, the heat dissipation capacity is sharply reduced, and the heated parts lose cooling, which may easily cause the cylinder head, cylinder liner, cylinder block and other parts to overheat, cause cracks, or cause the piston to overextend and jam in the cylinder liner Inside. On the other hand, if the diesel generator is not cooled down at idle speed when it is stopped, the friction surface will be insufficiently oily, and when the diesel engine is restarted, it will intensify wear due to poor lubrication. Therefore, the diesel generator should be unloaded before the flameout, and gradually reduce the speed and run at no load for several minutes.


Incorrect operation of diesel generators III: Load running without warming up after cold start


When the diesel generator is cold-started, due to the large viscosity and poor fluidity of the oil, the oil supply of the oil pump is insufficient, the friction surface of the machine is poorly lubricated due to lack of oil and lubrication, causing rapid wear, and even failures such as cylinder pulling and tile burning. Therefore, the diesel engine should be warmed up at idle speed after the start of cooling, and run with load when the standby oil temperature reaches 40 ° C or higher; the machine should start at low speed and drive a mileage in each gear step by step until the oil temperature is normal and the fuel supply is sufficient Only then can it switch to normal driving.


Incorrect operation of diesel generators IV: Throttle throttle after cold start of diesel engine


If the throttle is blasted, the speed of the diesel generator will rise sharply, which will cause some friction surfaces on the machine to wear out severely due to dry friction. In addition, the piston, connecting rod, and crankshaft receive a large change in the receiving force when the throttle is bombed, causing severe impacts and easy damage to the parts.


Diesel generator wrong operation five: running under insufficient cooling water or cooling water and high oil temperature


Insufficient cooling water amount of diesel generator will reduce its cooling effect. The diesel engine will overheat because it cannot get effective cooling; too high oil temperature of cooling water and oil will also cause the diesel engine to overheat. At this time, the diesel generator cylinder head, cylinder liner, piston assembly and valve are mainly subject to heavy heating loads, and their mechanical properties such as strength and toughness decrease sharply, which increases the deformation of the parts, reduces the gap between the parts, and accelerates the wear of the parts. , In severe cases, cracks and jammed parts will also occur. Overheating the diesel generator will also worsen the combustion process of the diesel engine, make the injector work abnormally, the atomization will be bad, and the carbon deposit will increase.


The above introductions to "common faults of diesel generators" and "what are the incorrect operation methods of diesel generators" are hoped to help you understand the "common problems of diesel generators and the introduction of wrong usage methods".

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