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Burning tile precursors. The speed of the diesel engine suddenly decreases, the load increases, the engine emits black smoke, and the oil pressure drops. This is a precursor to burning the tile. 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.
Viscous cylinder precursor. 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 low speed or idle to reduce the temperature of the vehicle. If you turn off the flame immediately, it will cause a sticky cylinder between the piston and cylinder liner.
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 "squeaky" sound of friction (piston hits the valve) or other abnormal sounds, the engine is not stable, it is often a precursor to valve outage, and should immediately stop and extinguish, otherwise it will hit. Bad pistons, cylinder heads and cylinder liners, even top bending linkages, breaking the body, breaking the crankshaft.
The precursor to the urn. The ramming cylinder is a destructive mechanical failure, which is mostly caused by the loosening of the connecting rod bolts in addition to the ram cylinder caused by the valve cylinder. After the connecting rod bolt is loosened or extended, the connecting clearance of the connecting rod bearing will increase. At this time, the knocking sound of “嗒嗒†will be emitted from the coaxial box, the knocking sound will increase from small to large, and finally the connecting rod bolt will completely fall off or Break, throw off the connecting rod and bearing cap to break the body and related parts.
Broken shaft precursor. When the diesel engine crankshaft journals and shoulders produce recessive cracks due to fatigue, the symptoms of the fault are not obvious. As the cracks increase, the boring knocking sound in the crankcase of the engine occurs, and the percussion sound increases when the engine speed changes. Black smoke, and soon, the percussion sound gradually increased, the engine was shaken, the crankshaft was broken, and then it turned off. Therefore, when an abnormal sound occurs in the crankcase of the engine, it should be stopped immediately.
The precursor of the flywheel rupture. When the flywheel has a hidden crack, a hammer will strike it with a hammer. When the engine is working, the flywheel will produce a knocking sound. When the wheel speed changes, the sound will increase and the engine will shake. If you do not stop the inspection at this time, it is very easy to cause the sudden rupture of the flywheel and the flying of debris out of wounds and other vicious accidents.
The precursor to "speed". Before the "speed car", the diesel engine will generally appear blue smoke, burning oil or unstable speed. At the beginning, the speed of the diesel engine is rapidly increased without being controlled by the throttle. Until the rated speed is exceeded, the engine emits a lot of black smoke or blue smoke. At this time, the engine speed will continue unless measures such as oil cut, air break, and decompression are taken quickly. Accelerated and squeaked, the smoke from the exhaust pipe diffused, and the speed was out of control, causing serious accidents such as blow-by-cylinder.
The diesel engine has a warning
Diesel engines generally have precursors before the onset. Grasp the precursor of diesel engine, can effectively prevent or reduce the occurrence of major mechanical accidents.