Cummins diesel generator set abnormal 8 factors

1. The cylinder pad has a small bubble on the edge of the cylinder pad, which will issue a channelling sound of \" snap, snap, snap ". The beginning is very small, very sharp, and has a tendency to be more and more large. The reasons are: the cylinder head nut torsion force is not average, cylinder head or cylinder pad deformation, high temperature gas leakage along the gap, resulting in cylinder pad burn; Initiate long hours of overload work, heat through high burn cylinder pad. When the cylinder head is found to leak, it should be removed and checked under cold condition to see whether the cylinder pad can be deformed or burned out. If damaged, replace it with a new one.

2. Abnormal valve sound when the valve clearance is too large, the rocker arm on the valve rod end of the percussion aggravated, so it sends out a loud percussion abnormal sound. The valve clearance after the heat engine will be smaller, so the knock noise is smaller. When the valve gap is too small, the sound of "snap, snap, snap" will be issued, and the sound will increase with the increase of the engine speed, and the heat engine is more obvious, and the exhaust valve can be burned when serious.

3. Abnormal sound of piston top Abnormal sound of piston is generally divided into loud metal knocking sound. There are three reasons: one is a foreign body such as a small gasket, screws, etc.) through the inlet pipe or device injector hole fell into the cylinder, when the piston movement to the left of the top of the piston; Second, the valve phase is not correct, such as the inlet valve early opening Angle or the exhaust valve late closing Angle is too large, or the valve timing gear is wrong, can make the piston and valve collision; Three is the serious wear or damage of the connecting rod tile, so that the connecting rod bearing clearance is too large, when the piston movement to the left and right of the top dead center and the valve collision, serious even can impact the cylinder head.

4. Bearing ring

(1) small tile ring small tile (connecting rod bearing) ring characteristics and load, speed changes are closely related. When the speed and load increase, the sound also increases, when the sudden acceleration, the continuous issue of \" Dangdang \" sound is particularly obvious. The reasons for the small tile sound are: the diesel engine overload working time is too long or the bearing temperature is too high to make the small tile full ablation; Bearing and journal wear is serious; If the clearance between bearing and journal is too large or the bearing cap bolt is loose, the diesel engine will encounter strong pressure and produce abnormal sound when doing work. If the matching gap between the connecting rod bearing and the journal is too small, the oil is difficult to enter the friction surface, not easy to form an oil film, the formation of poor smoothness, will make the journal and bearing dry friction or semi-dry friction and burn out the bearing.

(2) the abnormal sound of crankshaft bearings is heavier and stronger than that of connecting rod bearings. Rapid acceleration issued a dull beat \" boring boring \" sound, serious opportunity body has strong vibration, sound parts attack in the lower part of the cylinder block, and with the increase of speed, load and increase. This abnormal sound is mainly caused by the serious wear of the crankshaft bearing and journal, too large radial clearance or the lack of tightening torque of the bearing cover screw, and the bumping sound produced by the crankshaft jumping up and down after being stressed. If the oil quality is too poor or the oil pressure is low, it is not easy to form a smooth oil film, the bearing and the journal will be in a semi-dry and dry friction state; Or crankshaft bearing fit clearance is too small, the high temperature generated by friction will burn the bearing alloy. When the above condition is serious, the holding shaft will be formed.

(3) bushing abnormal noise diesel engine at the same speed, the sound of piston pin bushing is sharp than the sound of piston knocking cylinder, which is a kind of beat "da da da" similar to the knocking sound of steel ball collision. After the piston pin and connecting rod bushing wear, the matching gap is too large, the piston pin and pin seat hole wear loose, the oil pressure is too low, or the piston pin is seriously ablated due to poor smoothness, etc., the bushing abnormal sound can be formed. Yatong Electromechanical Equipment Co. LTD.

5. Cylinder abnormal sound diesel generator set at idle speed or slightly higher than idle speed, issued a similar small hammer percussion beat beat \" Dangdang\ "sound, that is, the so-called knock cylinder, and along with excessive diesel consumption, large fuel consumption and other phenomena. The reasons for the formation of knock cylinder are: serious wear of piston and cylinder, piston and cylinder wall clearance is too large; Piston deformation, piston pin and connecting rod bushing with too tight, connecting rod deformation, piston in the cylinder deflection operation; The injector is not working well, the oil advance Angle is not adjusted properly or the amount of oil supplied to each cylinder is not equal. Discriminating the parts of the percussion cylinder can be stopped by the cylinder oil cutting method. If the sound OF the high-pressure oil circuit of a cylinder is obviously weakened or disappeared when it is disconnected, and the knocking sound is heard again after oil supply is resumed, it is clarified that the clearance of the cylinder is too large, so that the piston knocks the cylinder. Such as the low temperature of the diesel engine knocking sound is not clear, the temperature rises after idling when \" gaga \" sound, body shaking, and the higher the temperature, the greater the sound, it is concluded that the piston or connecting rod deformation, should be timely maintenance.

6. The abnormal sound of the oil pan connecting rod impact the oil pan, will make the oil pan tremble, issued a depressed "percussion vibration" sound.

7. Abnormal noise of flywheel housing because the effective torque of diesel generator set is output by the flywheel, so once the flywheel screw loosens, it will inevitably produce intense vibration, and emit a great abnormal noise at the flywheel housing.

8. Abnormal noise of gear chamber The noise of gear chamber is directly related to the gear tooth clearance. When the clearance exceeds the regular value, intense noise is abnormal noise. The abnormal sound produced by excessive gear clearance is dense and clear \" rustle \" sound, and the loudness is fierce.

Summary: In the use of diesel generators, we will always encounter such and such problems, in fact, we pay attention to observe some abnormal sound of diesel generators in ordinary use, can timely find and solve the generator will or has occurred problems.

Jiangsu Meiao Power Technology Co., Ltd. is an important manufacturer of diesel generators. The company mainly manufactures and sells diesel generator sets with power of 3-3000kW, mobile power station of 24-600kW, Marine emergency diesel generator set of 24-800kW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, static speaker, mobile lighthouse, container, etc.) diesel generator At the same time, we are engaged in generator set maintenance and after-sale service of generator set accessories.