Premonition of major engine failure
Burning tile precursors. The speed of the diesel engine suddenly drops, the load increases, the engine emits black smoke, the oil pressure drops, and the crankshaft box emits dry rubs, 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. 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 a low speed or idle to reduce the temperature of the vehicle. If the flame is immediately shut off, a sticky cylinder may occur between the piston and the 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 “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. The precursor to the urn. 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 increases. At this time, the knocking sound of “click†can be heard in the crankcase part, the knocking sound becomes small and the connecting rod bolt completely falls off. Or break, the connecting rod and bearing cap thrown out, breaking the body and related parts. Broken shaft precursor. When the diesel engine crankshaft journal shoulder fatigue cracks occur, the symptoms of the failure is not yet obvious, with the expansion of cracks worse, the engine crankcase issued a boring knocking sound, percussion sound when the speed changes, the engine Smoky, and soon, the percussion sound gradually increased, the engine produced jitter, the crankshaft broke, and then energized. Therefore, when an abnormal sound occurs in the crankcase of the engine, it should be stopped immediately. The precursor to fragmentation of the flywheel. When the flywheel has a hidden crack, a hammer hits it and a husky noise will be heard. When the engine is working, the flywheel will produce a knocking sound. When the 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. 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 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.