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

2.機油量顯著增加，機油壓力下降，排氣管發出深黑色和藍色的煙霧。

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

3.混凝土攪拌車的產量大幅下降。高馬力約為額定輸出的60％（不包括由于高海拔而導致的功率下降），氣缸壓力小于標準壓力的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.曲軸磨損太大，磨損后曲軸軸頸的圓度和圓柱度之間的偏差超過了最大使用限制，或者圓度和錐度限制為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.發動機啟動或停止時，如果水溫為50-60°C，水溫將無法平穩啟動。

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

6.發動機高溫運轉時的發動機噪音或異常運轉，汽缸噪音（活塞爆震），主軸承或連桿軸承的劇烈振動或爆震噪音。

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攪拌車的條件。如果您再次了解這些條件，您將知道需要維修發動機。

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.