Small concrete mixer will inevitably be damaged for a long time after use. Under what conditions should the engine be overhauled? Let's have a look.

1、气缸内径过度磨损。圆度偏差为0.04-0.06mm，圆柱度偏差为0.08-0.12mm（通常，测量圆柱体的下半部分和上半部分之间的差值）。对于多缸发动机，圆度和圆柱度偏差基于具有磨损的一个汽缸。

1. Excessive wear of cylinder bore. The roundness deviation is 0.04-0.06mm, and the cylindricity deviation is 0.08-0.12mm (generally, the difference between the lower half and the upper half of the cylinder is measured). For multi cylinder engines, roundness and cylindricity deviations are based on the cylinder with the largest wear.

2、油量显着增加，油压下降，排气管发出黑色和蓝色烟雾。

2. The oil volume increased significantly, the oil pressure decreased, and the exhaust pipe emitted black and blue smoke.

3、混凝土运输搅拌机的功率大幅下降。其高马力仅为额定功率的60％左右（不包括高海拔引起的功率下降），其气缸压力低于标准压力的65％。

3. The power of concrete transport mixer is greatly reduced. Its high horsepower is only about 60% of the rated power (excluding the power drop caused by high altitude), and its cylinder pressure is less than 65% of the standard pressure.

4、曲轴磨损过多，曲轴磨损后曲轴的圆度和圆柱度偏差超过使用极限，或圆度和锥度限制在0.10mm。

4. If the crankshaft is worn too much, the deviation of roundness and cylindricity exceeds the maximum limit, or the roundness and taper are limited to 0.10 mm.

5.当发动机启动或停止时，如果温度为50 ^ -60°C，水温将无法平稳启动。

5. When the engine starts or stops, if the temperature is 50 ^ - 60 ° C, the water temperature will not start smoothly.

6、发动机异常或操作不正常。当发动机在高温状态下运转时，气缸内有噪音（活塞爆震），主轴承或连杆轴承发出严重的振动或敲击声。

6. Engine abnormal or abnormal operation. When the engine is running at high temperature, there is noise in the cylinder (piston knock), and the main bearing or connecting rod bearing makes serious vibration or knocking sound.

以上是小型混凝土搅拌机发动机大修的条件。如果你知道这一点，你会知道它会修理引擎。

These are the conditions for overhaul of small concrete mixer engine. If you know that, you will know that it will fix the engine.