These factors may lead to premature engine failure

　　1、气门的光磨在自动上料搅拌车的维修中，如果气门出现烧蚀、麻点及凹陷时，均应进行光磨，一般是在光磨机上进行，作业时需要注意四个问题：一是保证气门头与杆部同心，否则应先校直；二是光磨辆在能磨出完整的锥面的前提下是越小越好；三是尽量提高表面光洁度；四是气门杆端部凹陷应予以磨平。

　　1. In the maintenance of the automatic feeding mixer, if the valve is ablated, pitted and sunken, it should be polished. Generally, it is carried out on the smooth mill. Four problems should be paid attention to during the operation: first, ensure that the valve head is concentric with the rod, otherwise straighten it first; second, the smaller the smooth grinding vehicle can grind out the complete conical surface, the smaller the better; third, try to improve the meter The fourth is that the end depression of valve stem should be ground smooth.

　　2、气门导管的铰销气门杆与气门导管配合间隙是决定气门导管使用寿命的关键，因此当更换新的气门导管时，铰销时应严格掌握好配合间隙，使用各搅拌车车型规定间隙的下限，可有效延长使用寿命。

　　2. The fit clearance between the hinge pin and the valve guide of the valve guide is the key to determine the service life of the valve guide. Therefore, when replacing a new valve guide, the fit clearance should be strictly controlled. Using the lower limit of the clearance for each mixer can effectively prolong the service life.

　　3、气门的研磨气门的研磨分为两种情况：一是气门与气门座只有轻微麻点，不需要光磨和铰销时的研磨；二是气门与气门座均经过光磨和铰销后的研磨。前者先用足金钢砂研磨，将麻点研磨掉后，再用细金刚砂研磨，涂上机油研磨，直密封符合要求，宽度符合规定为止。后者只有密封性达不到要求时才进行研磨，但操作时要注意，不要过分用力，严禁将气门上下敲打，否则将出现凹形砂痕，影响维修质量。

　　3. The grinding of valve can be divided into two situations: one is that there are only slight pockmarks between the valve and the valve seat, and there is no need to polish and ream the pin; the other is that both the valve and the valve seat are polished and grinded after hinge pin. The former is first ground with full gold steel sand, after grinding off the pitting, then grind with fine emery and oil until the sealing meets the requirements and the width meets the requirements. The latter can only be grinded when the sealing performance can not meet the requirements. However, attention should be paid 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.

　　以上是关于影响搅拌车发动机过早损坏的因素，希望大家能多加注意，如您想要了解更多内容欢迎点击自动上料搅拌车http://www.jfhntjbc.com官网。

　　The above is about the factors that affect the premature failure of the mixer engine, I hope you can pay more attention, if you want to know more, welcome to click the automatic feeding mixer http://www.jfhntjbc.com Official website.