Burning tile precursor. The diesel engine operation speed reduces suddenly, load, engine black smoke, oil pressure is reduced, the crank case declared "chirp" dry friction sound, which is a precursor to the tile burning. Encounter this kind of situation should stop, otherwise it will further aggravate the wear of bearing and shaft neck surface scratch stick sensitive expansion, bearing and shaft neck will soon bond locking, engine flameout.
  The precursor visco cylinder. Stick cylinder in diesel engine general serious water shortages occur before the engine cylinder sticking operation temperature indicates the weakness, exceed 100 degrees, to the body a few drops of cold water, a hissing sound, and white smoke, water evaporates quickly. Then let the engine low-speed operation or idle operation to reduce the car temperature, if immediately flameout, will cause the piston and cylinder sleeve sticky cylinder.
  Falling cylinder valve precursor. Valve fall into the cylinder, generally because the valve rod break, valve spring break, valve spring seat cracking, valve lock clip falling causes. When the head part declared "Dangdang" (percussion piston valve, touch) "Tsatsa" friction sound (piston valve touch) or with other abnormal sound engine operation instability, is often a precursor to drop valve cylinder, then it should be that the parking stall, otherwise it will break the piston and cylinder head and cylinder, and even the top bending break body, connecting rod, crankshaft breaking.
  Pound cylinder precursor. Ramming cylinder is a destructive mechanical disadvantage, in addition to the valve drop cylinder caused by ramming cylinder, mostly because the connecting rod bolt loose caused by. The connecting rod bolts loosening or stretching, connecting rod bearing collaboration space increases, this time in the crankcase parts can hear "blah" percussion sound, percussion sound from small to large, at the end of the connecting rod bolts completely falling or broken, connecting rod and bearing cap thrown broken body and related parts.
  The broken shaft precursor. When the diesel engine crankshaft shoulder due to fatigue crack hidden, defect symptom is not obvious, with the increase in the expansion of the crack, the engine crankcase declared dull percussion sound, speed change heavier percussion engine black smoke, soon, knocking increases, engine crankshaft cracking, shaking, then by the fire. Therefore, when the engine crankcase abnormal dynamic, should stop inspection.
The fragmentation of the precursor flywheel. When the flywheel appeared latent crack, with hammer percussion, declares hoarse sound, when the engine is working, the flywheel will knock, speed change, the noise will be increased, the engine shaking. At this point, if not stop check, it is easy to cause the flywheel, but fragmentation, debris flying wounding and other malignant accidents.
  The precursor "speed". Speed before the diesel engine will generally appear blue smoke from burning oil, or speed instability phenomenon. Control, machine speed without throttle start diesel sensitive rise until exceed the rated speed, the engine off a lot of smoke or smoke. If not sensitive with a broken oil, gas, vacuum and other means to hinder, the engine speed will continue to rise, and declare the crazy roar, full of smoke exhaust pipe, the speed out of control, it will form a vibrating cylinder and other major accidents.