In general, abnormal noise rarely occurs when driving a small mixer. Once abnormal noise occurs, it may be that your small mixer has a problem. Some experienced drivers can determine the source of the problem from the sound.
When the load of the diesel engine is suddenly changed, a sharp "empty, empty, empty" dull knocking sound can be obviously heard near the left side of the crankcase, and it changes sharply with the increase of the load or speed of the small mixer. The noise increases. It can be heard more clearly when the fuel filler cover is opened, but it is not obvious when there is no load. This is due to the excessive wear of the connecting rod bush and the excessive fit clearance between the connecting rod bush and the crankshaft connecting rod journal. If a cylinder of the diesel engine is cut off and the abnormal noise disappears immediately, it is proved that the connecting rod bush of the cylinder is making noise.
If the engine of the small mixer runs at a high speed, it makes a clunking sound of "clunking, clunking", and suddenly reduces the accelerator, which is especially serious, because the axial clearance of the main bearing pad is too large.
When the diesel engine of the small mixer has heavy and continuous knocking sound at the lower part of the crankcase, the sound is clear and recognizable at low speed, and more obvious at heavy load. At the same time, the oil pressure decreases with the increase of the clearance between the main bearing pads of the crankshaft. When the engine suddenly changes the speed at low speed, the sound of "clang, clang" is emitted at the upper part of the cylinder, which is generally caused by the excessive fit clearance between the piston pin and the connecting rod bushing, or between the piston pin seat.
If the engine of a small mixer runs at high speed, it makes a clunking sound of "clunking, clunking" and suddenly reduces the accelerator, which is especially serious. This is because the axial clearance of the main bearing pad is too large. A loud, dull "hollow, hollow" knock is heard at the full length of the cylinder, and bubbles are found when opening the filler cap, which is caused by the excessive fitting clearance between the piston and the cylinder liner.
If the impact sound of "quack, quack, quack" is heard at the same part of the small mixer slightly in the direction of the crankshaft, it is the knock sound caused by the twisting of the connecting rod during operation. The last two sounds can be heard more clearly when the speed is changed, and they are easier to distinguish. There are similar sounds of small hammers hitting iron blocks at the top and bottom of the cylinder, and the exhaust pipe of the diesel engine emits blue smoke (accompanied by oil burning), It is easier to hear when the long handle screwdriver is pressed against the cylinder block, which is caused by excessive side clearance of the piston ring or broken ring.
The above is what you have explained. If you still have problems with the use of small mixers or have a purchase demand, please feel free to come to our website https://www.zishangliaojiaobanji.cn consulting service