Some mixer truck drivers reported that the same mixer truck they bought with their friends would have problems with the engine of their own vehicle after a period of use, but the engine of their friends' vehicle was OK. What is the matter? Let's learn about it.
1. Smooth grinding of valve
In the maintenance of small concrete mixer truck, if the valve is ablated, pitted and dented, it should be polished, generally on the polishing mill. Four problems should be paid attention to during the operation: first, ensure that the valve head and the rod are concentric, otherwise it should be straightened first; Second, on the premise that the smooth grinding vehicle can grind a complete cone, the smaller the better; Third, try to improve the surface finish; Fourth, the depression at the end of the valve stem should be polished.
2. Hinge pin of valve guide
The fitting clearance between the valve stem and the valve guide is the key to determine the service life of the valve guide. Therefore, when replacing the new valve guide, the fitting clearance shall be strictly controlled during the hinge pin. The lower limit of the clearance specified by each mixer truck model can effectively extend the service life.
3. Grinding of valves
The grinding of valves can be divided into two situations: first, the valve and valve seat have only slight pockmarks, which do not require polishing and grinding when hinge pins are used; Second, the valve and valve seat are polished after polishing and hinge pin grinding.
The former shall be grinded with full gold steel sand first, and then the pockmarks shall be grinded with fine carborundum, and then coated with engine oil until the sealing meets the requirements and the width meets the requirements. The latter can only be grinded when the sealing property fails to meet the requirements. However, attention must be paid during operation to avoid excessive force. It is strictly prohibited to knock the valve up and down, otherwise concave sand marks will appear, which will affect the maintenance quality.
The failure of the concrete mixer engine is not terrible, but the terrible thing is that the maintenance is not correct, and the performance of the engine will only get worse and worse. Follow our website http://www.zkzdsljbc.com Yes, for more information!