自動混凝土攪拌機是一種工作強度大、可靠性要求高的工程機械。為保證其的工作狀態，日常維護尤為重要。但是長期使用后，發動機可能會損壞，那么在什么情況下應該對發動機進行大修呢？下面將為您詳細介紹。

Automatic concrete mixer is a kind of engineering machinery with high working intensity and high reliability requirements. In order to ensure its efficient working state, daily maintenance is particularly important. But after long-term use, the engine may be damaged, so under what circumstances should the engine be overhauled? The following will give you a detailed introduction.

1、筒體內徑磨損過大，圓度偏差0.04-0.06mm，圓柱度偏差0.08-0.12mm（一般測量筒體下半部與上半部之差）。對于多缸發動機，圓度和圓柱度偏差以磨損嚴重的氣缸為準。

1. The inner diameter of the cylinder is excessively worn, with roundness deviation of 0.04-0.06mm and cylindricity deviation of 0.08-0.12mm (generally measure the difference between the lower half and the upper half of the cylinder). For multi cylinder engine, roundness and cylindricity deviation shall be subject to the cylinder with serious wear.

2、油量明顯增加，油壓下降，排氣管冒黑藍煙。

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

3、混凝土運輸攪拌機的功率顯著降低。其大馬力僅為額定功率的60%左右（不包括高海拔造成的功率下降），氣缸壓力低于標準壓力的65%。

3. The power of concrete transportation mixer is significantly reduced. Its high horsepower is only about 60% of the rated power (excluding the power reduction caused by high altitude), and the cylinder pressure is 65% lower than the standard pressure.

4、曲軸磨損過大，曲軸各軸頸磨損后的圓度和圓柱度偏差超過使用極限，或不圓度和錐度限制在0.10mm以內。

4. The crankshaft is excessively worn, and the roundness and cylindricity deviation of each crankshaft journal after wear exceeds the service limit, or the out of roundness and taper are limited within 0.10mm.

5、發動機啟動或停止時，水溫在50^-60℃的條件下不能順利啟動。

5. When the engine starts or stops, the water temperature cannot start smoothly under the condition of 50 ^-60 ℃.

6、自動混凝土攪拌機的發動機有異響或運轉異常。發動機在熱態運轉時，氣缸內有響聲（活塞敲擊聲），主軸承或連桿軸承有嚴重的振動或敲擊聲。

6. The engine of the automatic concrete mixer has abnormal noise or abnormal operation. When the engine is running in hot state, there is a noise (piston knocking) in the cylinder, and the main bearing or connecting rod bearing has serious vibration or knocking.

以上是混凝土運輸攪拌車發動機檢修的條件，此外，在有可能結冰的環境中使用時，必須將供水系統排空并儲存，以防止管道結冰和開裂；經常檢查系統的密封性，對關鍵部位的管道進行密封。更多內容就來我們網站http://www.gdfcx.net獲取信息吧。

The above conditions are for the maintenance of the engine of the concrete transportation mixer. In addition, when it is used in an environment that may be frozen, the water supply system must be emptied and stored to prevent the pipeline from freezing and cracking; Regularly check the tightness of the system and seal the pipes at key parts. Come to our website for more information http://www.gdfcx.net Get information.