Differentiation of several abnormalities of diesel engine

1.Diesel generators组Valve room
There is a rhythmic \"当 \ \" metal knocking sound in the cylinder, and the downtime can see the traces of the valve and the top of the piston. The main reason is that the valve gap is off, the valve seat ablation or loose, the pressure reducing mechanism is not adjusted. If the cylinder cover is emitted,\", \ 嚓 \" is accompanied by \",, \" airflow, the sound is more obvious, this is the pneumatic seat, the seat, the valve The impact between the cylinder head; close to the injector on the upper part of the diesel engine, hear the crisp heavier \"铛, 铛\" hits the sound, and changes with the speed change, and the start and combustion is not normal. This may be the vortex chamber insert; the diesel air door housing has issued a similar to breaking the squeezing sound, or the hitting sound of the two springs, while the exhaust pipe is broken, the diesel engine is unstable. Black smoke, this is caused by the air springs; in the cylinder head and the cylinder head, if there is a rude and sharp \",, \", accompanied by 气, smoking, this is The cylinder pad is rinsed; if you hear \",, \" ring at the air filter, and the diesel engine is difficult to start, or after starting, it is time to touch the air pipe, which is hot, mostly the valve Burning (eclipage), carbon deposit, closed without strictness.
2.Diesel generators组Gear chamber
Using a metal rod to the timing gear cover, when he heard the rhythmic \", \" sound, the sound is even greater, this is the timing gear shaft and the bushing and the bushing gap are too large. The whistlement is caused; if the rose sound of the diesel speed is increased with the rapid speed of the diesel engine speed, it means that the timing gear shaft and the bushing gap are too small; when the diesel engine is running, at the timing gear chamber and the camshaft On the side, the rhythmic \"嘎 \ \" sound, the medium and low speeds are highlighted, the high speed becomes messy and has broken snoring, if the noise is increased during large load, this is the timing gear meshing gap excessive, teeth The surface of the two gears occur after mourning, or the bushing was worn, and the exhaust voices occurred in the diesel engine operation, and it was difficult to operate, which is timing gear load error, equilibrium quality is wrong, or balance axis The bearing is seriously worn.
When the flywheel is loose, \"哐 哐, 哐 哐 \" or \"嘎 嘎 \" sound, this kind of sound is relatively large, especially when the diesel speed is suddenly changed, and the sound is more likely, and it is usually understood in the back of the diesel engine, and some When the sound is very small, this sound is not necessarily regular. If there is no oil after the stop, the cylinder pressure reducing valve is turned on, quickly shake the crankshaft, and suddenly remove the decompression, and he can hear \"哐 哐, 哐 哐 \" sound. If the flywheel is loose, the flywheel is switched with a hand in the downtime. The main reasons for the flywheel are: the flying nut is loose during the work, and the nut is not tightened when the flywheel is installed. It is found that the flywheel is loose, and the nut should be fastened in time, otherwise it will cause serious consequences.
3.Diesel generators组Crankcase is unbearable
When the diesel engine suddenly changed the load, the short-proof type of \"empty, empty, empty \" blunt hoism sound is clearly heard in the vicinity of the crankcase (in the middle to the lower portion of the cylinder block), and increase the load or speed increase The rapid change, the sound increases, and it is not obvious when there is no load. This is an overwearing of the connecting rod, which causes the gap between the connecting rod and the connecting rod journal. If the diesel engine is broken, if the abnormal sound disappears, it will be explained that it is the link of the cylinder. When there is a heavy and continuous knocking sound under the crankcase, the sound is clearly distinguished when the low speed is clear, and the heavy load is more obvious, and the pressure of the oil oil is reduced, which is too large; when the engine low speed suddenly change the speed At the time of the upper part of the cylinder, \"铛, 铛 \" sound, which is too large if the piston pin is too large to the connecting gap of the piston pin. If the diesel engine is running at high speed, it is particularly obvious when it is\"\" 噔, 噔 \", suddenly reduces the throttle, which is the main shaft watt-directional clearance; in the full length of the cylinder, I heard the dull \" Empty, empty \"knocking, and opened the filling of the oil mouth, it was found that there was a bubble (explained that there was a leakage phenomenon), which is too large if the piston is too large; if the same part is slightly reached by the same part After listening to \"嘎, 嘎, 嘎 \" hit the sound, the link distortion caused its knocking sound generated in the work, the latter sound is more obvious when changing the diesel engine speed, and it is more likely to distinguish; along the cylinder There are sounds similar to small hammers in the upper and lower, exhaust pipes are blue (accompanied by burning oil phenomena), which is easier to hear with long-handle screwdrivers to the cylinder block, that is, it can be concluded is a piston ring. The side gap is too large or the ring break is caused.