For multi cylinder engine, the deviation between roundness and cylindricity is based on the cylinder with the highest wear.

2.机油量显着增加，机油压力下降，排气管发出深黑色和蓝色的烟雾。

2. The amount of oil increases significantly, the oil pressure decreases, and the exhaust pipe emits dark black and blue smoke.

3.混凝土搅拌车的产量大幅下降。高马力约为额定输出的60％（不包括由于高海拔而导致的功率下降），气缸压力小于标准压力的65％。 ..

3. The output of concrete mixer truck decreased greatly. High horsepower is about 60% of rated output (excluding power reduction due to high altitude), and cylinder pressure is less than 65% of standard pressure

4.曲轴磨损太大，磨损后曲轴轴颈的圆度和圆柱度之间的偏差超过了使用限制，或者圆度和锥度限制为0.10 mm。

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

5.发动机启动或停止时，如果水温为50-60°C，水温将无法平稳启动。

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

6.发动机高温运转时的发动机噪音或异常运转，汽缸噪音（活塞爆震），主轴承或连杆轴承的剧烈振动或爆震噪音。

6. Engine noise or abnormal operation when the engine is running at high temperature, cylinder noise (piston knock), violent vibration or knock noise of main bearing or connecting rod bearing.

以上是大修自上料多功能搅拌车的条件。如果您再次了解这些条件，您将知道需要维修发动机。

The above are the conditions for overhauling the self loading multifunctional mixer. If you understand these conditions again, you will know that the engine needs to be repaired.