How to solve the problem of noise produced by piston cylinder of automatic feeding mixer?
In the process of driving, the automatic feeding mixer will produce the abnormal sound of life plug ring. The method of judging and handling the automatic feeding mixer will be described below.
The main reasons for the piston bursting are as follows: the gap between the piston and the cylinder wall is too large. The standard clearance between piston skirt and cylinder of WD615 Series engine is 0.143-0.182, and the maximum wear limit is 0.35-0.40. After the engine has been running for some time, the cylinder piston is worn and poorly lubricated. The matching clearance between the piston and the cylinder increases due to wear, and serious steps occur in the first gas ring, resulting in the piston hitting the cylinder. Abnormal sound. After a period of operation, the piston skirt and cylinder block are severely worn, resulting in serious rounding and impact on the cylinder block. Each chain link is deformed due to various reasons, resulting in eccentric piston, larger clearance and cylinder being hit. Piston knock cylinder will lead to excessive engine fuel consumption, engine fuel consumption, fuel consumption and economy. When the piston hits the cylinder severely, it will pull the piston and break the cylinder, which will cause the connecting rod to break and damage the cylinder block.
To judge the bursting of piston:
（1） Cylinder to cylinder cutting: the position of the blasting cylinder is determined by cylinder by cylinder method. If the oil is cut into the cylinder, the sound will be greatly reduced or disappear, and can be heard clearly when the oil supply is restored. The "click" sound indicates that the cylinder piston strikes the cylinder.
（2） In order to further confirm that the cylinder piston has been knocked, the fuel injector of the cylinder can be removed, a small amount of Cd level booster oil （seal） can be added to the cylinder, the fuel injector can be installed, and then the engine starts. The knocking sound disappears or weakens. After the operation, there will be a knock on the door again, which will undoubtedly knock on the cylinder of the cylinder.
For piston cylinders, the following methods can be used:
（1） When the engine is started and running at low temperature, the engine will knock. After the temperature returns to normal, the sound disappears and can be temporarily processed without further processing.
（2） When the engine temperature is normal, there will be a clear knocking sound. Try to avoid high-speed operation, disassembly and maintenance.
（3） After the cylinder head is removed and the piston is pulled out, it is found that the cylinder is seriously separated or deformed, or the clearance between the piston and the cylinder is too large, the cylinder sleeve, piston and piston ring should be replaced.
（4） If the connecting rod （concrete mixer） is found to be deformed, it should be replaced as much as possible.
This is how to solve the problem of piston cylinder noise of automatic feeding mixer. I hope it can help you