8 major factors of abnormal noise in diesel engine generator set

1. cylinder pad knock cylinder pad edge presents a small bubble, will be issued "Chow, Chow Chow," channeling gas sound, the beginning is very small, very sharp, there are more and more big trend. The reasons are: cylinder head nut tightening force does not mean, the cylinder or cylinder pad deformation, high temperature gas along the slot leakage, cause cylinder gasket burning; launched a long time of work overload, through the high temperature burning cylinder gasket. When the cylinder head leaks, it should be checked under cold condition. Can the cylinder pad be deformed or burned out?. New parts should be replaced in case of damage.

2. valve abnormal sound, valve clearance is too large, the rocker arm of the valve end of the hammer increases, so loud noise sounded. The valve clearance of the engine will be smaller, so the knock is smaller. The valve clearance is too small, will be issued, "Ca, CA, CA \" sound, and with the engine speed increased noise is increased, and the engine is more obvious, serious when can make the exhaust valve burning.

3. piston abnormal sound, piston fixed noise, the general is divided into loud metal percussion sound. There are three reasons: one is the foreign bodies such as small screw gasket, etc.) through hole fall into the cylinder inlet pipe or the injector device, when the movement of the piston top dead point near the impact piston top; two is the timing is not correct, such as the early intake valve open angle or late exhaust valve closing angle is too large, or the gas distribution timing gear installed wrong, can make the piston and connecting rod valve collide; three is badly worn or damaged, the connecting rod bearing clearance is too large, when the piston reaches TDC near and valve collide, serious to hit the head.

4., bearing ring (1) small watt ring, small watts (connecting rod bearing) ring characteristics, and load, speed changes are closely related. When the speed and load increase, the noise also increases, and when suddenly accelerates, the continuous "[Dangdang \" sound is particularly obvious. The reasons are: small tile sound engine for too long or the bearing temperature is too high to make small tile comprehensive ablation; bearing and shaft neck wear; bearing and shaft neck with the gap is too large or bearing cap bolts are loose, the diesel engine in the work by strong pressure and abnormal sound. Connecting rod bearings and shaft neck clearance gap, if too small, the oil is difficult to enter the friction surface, not easy to form oil film, forming a smooth bad, will cause the journal and bearing dry friction or half dry friction and burn bearings. (2) the abnormal sound of crankshaft bearing is more powerful than that of connecting rod bearing. When the acceleration is accelerated, the dull and rhythmic "boring / boring" sound is produced, the serious opportunity body has stronger vibration, and the sound part occurs at the lower part of the cylinder body, and increases with the increase of the speed and load. This kind of abnormal sound is mainly caused by the serious abrasion of the crankshaft bearing and the journal, the excessive radial clearance or the lack of the tightening torque of the bearing cap. If the oil quality is poor or low oil pressure, it is difficult to form a smooth oil film, bearings and shaft neck will be given a half dry and dry friction state; or crankshaft bearing clearance is too small, friction produced by the high temperature will burn bearing alloy. When the condition is serious, the axle shaft is formed. (3) Bush noise diesel engine at the same speed, piston pin bushing sound than the piston knocking voice loud sharp, is a rhythmic "dadada" is similar to the collision of steel ball percussion sound. When the piston pin and the connecting rod bushing are worn out, the clearance between the piston pin and the pin seat hole is too loose, the oil pressure is too low, or the piston pin is badly damaged because of the poor smoothness, and the bushing can cause the abnormal sound of the bushing. Fuzhou Botai Machinery Equipment Co., ltd..

5. cylinder diesel engine abnormal sound generator at idle or slightly higher than the idle running, a similar small hammer beats "Dangdang \" sound, the so-called knock, and with the diesel engine oil consumption cost too much, a large quantity of phenomenon. Cause of knocking: piston and cylinder wear, the piston and the cylinder wall clearance is too large; deformation of piston, piston pin and connecting rod bushing with the tight connecting rod deformation, deflection piston in the cylinder operation; bad injector, fuel supply advance angle of the cylinder oil or improper adjustment of volume average. The location of knocking cylinder can be stopped by cylinder by breaking oil. If a high pressure oil cylinder off of sound weakened or disappeared, oil recovery after hearing sound, then the cylinder with the gap is too large, so that the piston knocking. For example, when the diesel engine is low temperature, the knock is not clear, and when the temperature increases, the idle running has "rattle" sound, the body vibration vibration, and the higher the temperature, the louder the sound, then the piston or connecting rod deformation, should be timely maintenance.

6., the bottom of the oil tank abnormal sound, connecting rod big impact on the oil pan, will make the oil tank fibrillation, issued a more depressed "knock vibration" sound.

7. flywheel housing abnormal sound, because the diesel generator set of effective torque from the flywheel output, so once the flywheel screws loose, will produce a strong vibration, in the flywheel housing issued a big abnormal sound.

The noise in the gear room of the 8. gear chamber is directly related to the backlash of the gear. When the backlash exceeds the regular value, it produces a sharp noise, i.e., abnormal sound. Excessive clearance of gear produces abnormal sound, dense and clear "rustle \" sound, and the loudness is intense.