Some mixer drivers reported that the engine of the same mixer purchased at the same time with a friend would have problems after using the vehicle for a period of time, but the engine of the friend's vehicle was OK. What is the matter? Let's get to know.

1. 攪拌車的維修數據應用不當

1. improper application of maintenance data of mixer truck

在攪拌車維修中不能科學的選擇維修數據是造成機件早期損壞的重要原因。比如氣門與氣門座接觸面的寬度，規定進氣門為1-2.2mm，排氣門為1.5-2.5mm，但在實際維修當中，很多人認為寬一點比窄一點要好，習慣選用上限或接近上限值，因為剛修好的車氣門工作面寬度就已經接近使用極限了。再比如氣門腳間隙，一般車輛規定為0.2-0.25mm，但在維護調整中也會認為間隙大一點比小一點好，因此，超上限使用，實際上間隙過大，不但降低發動機功率，還會出現敲擊聲而早期損壞。

The failure to scientifically select maintenance data in the maintenance of mixer truck is an important reason for the early damage of mechanical parts. For example, the width of the contact surface between the valve and the valve seat is specified as 1-2.2mm for the inlet valve and 1.5-2.5mm for the exhaust valve. However, in the actual maintenance, many people think that it is better to be a little wider than a little narrower. They are used to selecting the upper limit or close to the upper limit, because the width of the valve working surface just repaired is close to the service limit. Another example is the valve foot clearance, which is generally 0.2-0.25mm for vehicles, but it is also considered that a larger clearance is better than a smaller clearance in maintenance and adjustment. Therefore, when the upper limit is exceeded, in fact, the clearance is too large, which not only reduces the engine power, but also causes knocking and early damage.

2. 氣門的光磨

2. smooth grinding of valve

在攪拌車的維修中，如果氣門出現燒蝕、麻點及凹陷時，均應進行光磨，一般是在光磨機上進行，作業時需要注意四個問題：一是保證氣門頭與桿部同心，否則應先校直；二是光磨輛在能磨出完整的錐面的前提下是越小越好；三是盡量提高表面光潔度；四是氣門桿端部凹陷應予以磨平。

During the maintenance of the mixer truck, if the valve is ablated, pitted or sunken, it should be polished, usually on the grinder. Four problems should be paid attention to during the operation: first, ensure that the valve head is concentric with the rod, 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 shall be ground flat.

3. 氣門導管的鉸銷

3. hinge pin of valve guide

氣門桿與氣門導管配合間隙是決定氣門導管使用壽命的關鍵，因此當更換新的氣門導管時，鉸銷時應嚴格掌握好配合間隙，使用各攪拌車車型規定間隙的下限，可有效延長使用壽命。

The fit 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 fit clearance shall be strictly controlled during hinge pin. The lower limit of the clearance shall be specified for each mixer model to effectively extend the service life.

4. 氣門的研磨

4. grinding of valve

氣門的研磨分為兩種情況：一是氣門與氣門座只有輕微麻點，不需要光磨和鉸銷時的研磨；二是氣門與氣門座均經過光磨和鉸銷后的研磨。前者先用足金鋼砂研磨，將麻點研磨掉后，再用細金剛砂研磨，后涂上機油研磨，直至密封符合要求，寬度符合規定為止。后者只有密封性達不到要求時才進行研磨，但操作時一定要注意，不要過分用力，嚴禁將氣門上下敲打，否則將出現凹形砂痕，影響維修質量。

The grinding of valve can be divided into two cases: one is that the valve and valve seat have only slight pitting, and there is no need for smooth grinding and grinding when hinge pin is used; Second, the valve and valve seat are polished and polished after hinge pin. The former shall be ground with full gold steel sand first, and then with fine emery after the pitting is removed, and then coated with engine oil for grinding until the sealing meets the requirements and the width meets the requirements. The latter shall be grinded only when the sealing performance fails to meet the requirements, but 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, affecting the maintenance quality.

混凝土攪拌車發動機出故障不可怕，可怕的是維修不正確，那發動機的性能只會越來越差。攪拌車價格實惠，現在購買正合適。

The engine failure of concrete mixer truck 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. The mixer truck is affordable. Now it's right to buy it.

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The wonderful contents of this article are provided by the knowledge of the automatic feeding mixer. There are many wonderful contents on this website. You can click to enter more contents http://www.skippers-products.com/ We have special customer service to answer your questions