Symptoms before failure of a diesel generator set

If the diesel generator set encounters a big failure, it will have serious consequences. What are the signs before the failure?
1. Precursors for burning tiles The speed of the diesel engine suddenly decreases, the load increases, the engine emits black smoke, the oil pressure drops, and the crankshaft rubs with a dry rub, which is a precursor to burning tiles. In this case, the machine should be shut down immediately. Otherwise, the wear of the bearing bush will be further aggravated. The surface of the journal will stick quickly and expand quickly. The bearing bush and the journal will quickly stick and lock, and the engine will stall.

2. The precursor to valve drop
The valve falls into the cylinder, which is generally caused by the valve rod breaking, the valve spring breaking, the valve spring seat cracking, and the valve lock clip falling off. When the head of the cylinder emits a “Dang Dang” percussion sound (piston hits the valve), “嚓嚓” friction sound (piston hits the valve) or accompanied by other abnormal sounds, when the engine is not stable, it is often a precursor to valve drop. At this time, the engine should be stopped and extinguished immediately. Otherwise, the piston, cylinder head and cylinder liner, and even the top-bending connecting rod will be broken to break the body and break the crankshaft.

3. The precursor of the broken shaft When the diesel engine crankshaft journal shoulders produce recessive cracks due to fatigue, the symptoms of failure are not obvious. As the cracks enlarge and aggravate, a boring knocking sound is generated in the crankcase of the engine, and knocking occurs when the rotation speed changes. The sound of aggravation increased, and the engine smoked black smoke. Soon, the percussion sound gradually increased, the engine generated jitter, the crankshaft fractured, and the ensign fired. Therefore, when an abnormal sound occurs in the crankcase of the engine, it should be stopped immediately.

4. The precursor of the sticky cylinder
Viscous cylinders generally occur in the case of severe water shortage in the diesel engine. The viscous cylinder is incapable of running the engine. The water temperature indicator indicates that the temperature exceeds 100°C. A few drops of cold water are poured onto the airframe. There is a buzzing noise and white smoke. Evaporate quickly. At this time, the engine should be allowed to run at a low speed or idle to reduce the temperature of the unit. If the flame is immediately shut off, a sticky cylinder may occur between the piston and the cylinder liner.

5. The precursor to the cylinder
Cylinder is a destructive mechanical failure, in addition to the cylinder caused by the valve drop cylinder, mostly due to loose bolts caused by connecting rods. After the connecting rod bolt is loosened or stretched, the connecting clearance of the connecting rod bearing is increased. At this time, the knocking sound of “click” can be heard in the crankcase part, and the knocking noise is changed from small to large. Completely detached or broken, the connecting rod and bearing cap thrown out, breaking the body and related parts.

6. Precursors of "Speeding" Before the "Speeding", diesel generators generally appear to emit blue smoke, burning oil, or unstable speed. At the beginning, the speed of the diesel engine was not controlled by the throttle, and it quickly rose until it exceeded the rated speed, and the engine emitted a lot of black smoke or blue smoke. At this point, if the measures of oil cut, gas cut, and decompression are not quickly taken to stop, the engine speed will continue to increase, and the squeaky sound will be generated. The exhaust pipe will be filled with smoke and the rotation speed will be lost. This will cause major accidents such as blow-by-cylinder occur.

7. Precursors of flywheel fragmentation When the flywheel has a hidden crack, hammering with the hand hammer will produce a hoarse noise. When the engine is working, the flywheel will produce a knocking sound. When the rotation speed changes, the sound will increase and the engine will shake. . If you do not stop the inspection at this time, it is easy to cause the flywheel to suddenly break, and the debris fly out of wounds and other vicious accidents.

For more information about diesel generators, please call the Shengfeng team. Fifteen years of professional experience in the production and sales of power generation equipment, more professional team of engineers to serve you, choose Shengfeng choose to rest assured, the plant covers an area of ​​10,000 square meters, with 800,000 units / year machine production capacity, welcomed the field factory.
Company Name: Yangzhou Shengfeng Power Equipment Factory Address: No. 88 Hongyuan Road, Shaobo Town, Jiangdu District, Yangzhou City (Navigation Search: Hongyuan Road, Jiangdu District, Yangzhou, Jiangsu Province)