Precursors before diesel generator failure

When users use a diesel generator set, the last thing they want is to have a failure. Once the unit fails, it will not only cause varying degrees of damage to the entire unit, but also reduce production efficiency, delay the production process, and even pose a threat to the personal safety of the staff. Shandong diesel generator set manufacturer Yichen Power introduced that in fact, diesel generator sets often show certain abnormalities before they malfunction. Users can evaluate the condition of the diesel generator set based on these "premonitory" performances and take preventive measures.

1. Sticky cylinder. Cylinder sticking usually occurs when a diesel engine is severely short of water. Before the cylinder sticks, the engine is unable to operate, and the water temperature gauge indicates more than 100°C. If you put a few drops of cold water on the engine body, there will be a "hissing" sound and white smoke will appear. The water drops quickly. Transpiration. At this time, the engine should be allowed to operate at low speed or idle speed to lower the unit temperature. If the engine is turned off immediately, it will cause the piston and cylinder liner to stick.

2. Burn tiles. During the operation of the diesel engine, the speed suddenly drops, the load increases, the engine emits black smoke, the oil pressure drops, and a "chirping" dry friction sound is emitted in the crankcase, which is a precursor to tile burning. When encountering this situation, you should stop the engine immediately. You will further increase the wear of the bearing bush, the scratches on the journal surface will expand rapidly, the bearing bush and the journal will soon bond and lock, and the engine will stall.

3. The valve is dropped from the cylinder. The valve entering the cylinder is usually caused by a broken valve stem, broken valve spring, cracked valve spring seat, falling valve lock clip, etc. When the cylinder head makes a "dang-dang" knocking sound (the piston hits the valve), a "chuck" friction sound (the piston hits the valve), or is accompanied by other abnormal sounds, and the engine operates unstable, it is often a precursor to valve drop. At this time, you should stop the car immediately, otherwise the piston, cylinder head and cylinder liner will be damaged, or even the connecting rod will be bent, the engine body will be broken, and the crankshaft will be broken.

4. Broken shaft. When a hidden crack occurs at the journal shoulder of the diesel engine crankshaft due to fatigue, as the crack expands and intensifies, a dull knocking sound is emitted in the engine crankcase. When the speed changes, the knocking sound increases, the engine emits black smoke, and then knocks. The sound gradually increased, the engine crankshaft cracked, and then stalled.

5. Pound the vat. In addition to cylinder damage caused by the valve falling into the cylinder, it is mostly caused by loosening of the connecting rod bolts. A "click-click" knocking sound can be heard in the crankcase, and the knocking sound changes from small to louder. In the end, the Fujian engine's connecting rod bolt completely fell or broke, and the connecting rod and bearing cap were thrown out, breaking the body and related parts.

6. "Speed ​​car". Before "speeding", diesel generators usually emit blue smoke, burn oil or rotate at an unstable speed. At the beginning, the speed of the diesel engine is not controlled by the throttle and rises rapidly until it exceeds the rated speed and the engine emits a lot of black smoke or blue smoke. At this time, if measures such as cutting off the oil, cutting off the air, and reducing pressure are not promptly adopted, the engine speed will continue to rise and roar, the exhaust pipe will be filled with thick smoke, and the speed will be out of control, which will cause serious accidents such as cylinder damage. attack.

7. Flywheel. When there are hidden cracks in the flywheel, it will make a hoarse sound when struck with a hammer. When the engine is running, the flywheel will make a knocking sound, and the sound will increase when the speed changes. If the machine is not stopped for inspection at this time, it may easily lead to vicious accidents such as the flywheel suddenly breaking and fragments flying out and injuring people.

Various faults will occur during the use of the diesel generator set. During the operation, the user can refer to the above content and make a rough judgment on the fault problem of the diesel generator set based on the above situation, so as to make timely corrections and prevent the problem from expanding and affecting the performance of the diesel generator set. Operation of diesel generator set.