1.小型搅拌车的维护数据使用不当：在小型搅拌车的维护中未能科学地选择维护数据是造成零件过早损坏的重要原因。例如，对于进气门，气门与气门座之间的接触表面的宽度被规定为1-2.2mm，对于排气门，规定为1.5-2.5mm。但是，在实际维护中，许多人认为宽而不是窄更好，通常选择上限或接近上限。上限，因为新修理的汽车的阀门工作表面的宽度已经接近使用极限。另一个示例是气门座间隙，通常将其指定为车辆的0.2-0.25mm。然而，在维护调整中，还应考虑到间隙大于小于间隙。因此，如果间隙超过上限，则间隙实际上过大，这不仅会降低发动机功率，而且还会由于撞击而导致早期损坏。
1. Improper use of maintenance data of small mixer: failure to select maintenance data scientifically in the maintenance of small mixer is an important reason for premature damage of parts. For example, the width of the contact surface between the valve and the valve seat is specified as 1-2.2mm for the intake valve and 1.5-2.5mm for the exhaust valve. However, in the actual maintenance, many people think that it is better to be wide than narrow, and usually choose the upper limit or close to the upper limit. Because the width of the valve working surface of the newly repaired car is close to the service limit. Another example is the valve seat clearance, which is usually specified as 0.2-0.25mm of the vehicle. However, in the maintenance adjustment, the clearance greater than or less than the clearance should also be considered. Therefore, if the clearance exceeds the upper limit, the clearance is actually too large, which will not only reduce the engine power, but also cause early damage due to impact.
2.阀门的平滑打磨：在小型搅拌车的维护中，如果阀门被烧蚀，凹坑或凹陷，则应将其打磨，通常是在光滑的研磨机上进行。在操作过程中需要注意四个问题：确保阀头与阀杆同心，否则应先将其拉直；第二点是，如果可以磨出完整的圆锥体，则平滑的轿厢应尽可能小。第三是尽可能提高表面光洁度。第四是阀杆的末端是凹进的，应接地。

2. Smooth grinding of valve: in the maintenance of small mixer, if the valve is ablated, dented or sunken, it should be polished, usually on a smooth grinder. In the process of operation, we need to pay attention to four problems: ensure that the valve head is concentric with the valve stem, otherwise it should be straightened first; the second point is that if the complete cone can be ground out, the smooth car should be as small as possible. The third is to improve the surface finish as much as possible. Fourth, the end of the stem is concave and should be grounded.
3.气门导管的铰链销：气门杆和气门导管之间的间隙是确定气门导管使用寿命的关键。因此，在更换新的气门导管时，应严格控制铰链销的间隙，并应使用每种小型搅拌车型号规定的间隙。可以有效地延长使用寿命。
3. Hinge pin of valve guide: the clearance between valve stem and valve guide is the key to determine the service life of valve guide. Therefore, when replacing the new valve guide, the clearance of hinge pin should be strictly controlled, and the clearance specified by each small mixer model number should be used. It can effectively prolong the service life.
4.阀的磨削：阀的磨削分为两种情况：一种是阀和阀座仅有轻微的点蚀，而无需磨削和铰链销磨削。另一个是阀和阀座都经过抛光和铰链销钉。研磨后，前者先用纯金钢砂磨碎，然后将凹坑磨掉，再用细金刚砂研磨，涂上机油进行研磨，直到密封达到要求，宽度达到要求。后者仅在密封不符合要求时才接地，但在操作过程中必须小心，不要用力过大，严禁上下敲打阀门，否则会出现凹形的砂痕，这会影响维护质量。
4. Grinding of valve: grinding of valve can be divided into two cases: one is that there is only slight pitting corrosion on valve and valve seat, and there is no need for grinding and hinge pin grinding. The other is that the valve and seat are polished and hinged. After grinding, the former is first ground with pure steel sand, then the pits are ground off, then ground with fine emery, and finally coated with engine oil for grinding until the seal meets the requirements and the width meets the requirements. The latter is only grounded when the seal does not meet the requirements, but in the process of operation, care must be taken not to use too much force. It is strictly forbidden to knock the valve up and down, otherwise concave sand marks will appear, which will affect the maintenance quality.
混凝土搅拌车发动机发生故障并不可怕。可怕的是，维修不正确，发动机的性能只会变差。小型搅拌车适中，现在就购买。
Concrete mixer engine failure is not terrible. The terrible thing is that if the maintenance is not correct, the performance of the engine will only deteriorate. The price of small mixer is moderate. Buy it now.