混凝土运输搅拌车发动机大修的条件！
混凝土搅拌运输车是一种工作强度大，可靠性要求高的工程机械，要保证其高能的工作状态，日常保养尤为重要。但是在长时间使用过后，发动机可能会损坏，那什么条件下就应该对发动机大修呢？下面就为您详细介绍一下。
Concrete mixer truck is a kind of construction machinery with high working strength and high reliability requirements. In order to ensure its high-energy working state, daily maintenance is particularly important. But after a long time of use, the engine may be damaged. Under what conditions should the engine be overhauled? Here is a detailed introduction for you.
一、气缸内径磨损过甚，其圆度偏差为0.04-0.06毫米，圆柱度偏差为0.08-0.12毫米(一般以缸简下半部与上半部测量比差)。对于多缸的发动机，圆度和圆柱度偏差以其中磨损较大的一个气缸为依据。
1、 The inner diameter of the cylinder is worn too much, the roundness deviation is 0.04-0.06mm, and the cylindricity deviation is 0.08-0.12mm (generally, the ratio difference between the lower half and the upper half of the cylinder is measured). For the multi cylinder engine, the roundness and cylindricity deviation is based on the cylinder with larger wear.
二、机油量显著增加，机油压力下降，排气管冒黑蓝色浓烟。
2、 The amount of engine oil increases significantly, the pressure of engine oil decreases, and the exhaust pipe emits black and blue smoke.
三、混凝土运输搅拌车功率显著下降，其髦大马力只有额定功率的60%左右(不包括海拔高而导致的功率下降)，其气缸压力低于标准压力的65%以下。
3、 The power of concrete mixer truck decreases significantly, its high power is only about 60% of the rated power (excluding the power decrease caused by high altitude), and its cylinder pressure is less than 65% of the standard pressure.
四、曲轴磨损过多，曲轴各轴颈磨损后的圆度和圆柱度偏差超过使用限度，或失圆、锥度均按0.10毫米为限。五、发动机起动时或停车后，水温在50^-60℃的情况下不能顺利起动。
4、 If the crankshaft is worn too much, the roundness and cylindricity deviation of each journal of the crankshaft after wear exceeds the use limit, or the out of roundness and taper are limited to 0.10 mm. 5、 The engine can not start smoothly when the water temperature is between 50 ^ - 60 ℃ when it is started or stopped.
六、发动机异响或运转不正常，发动机运转在热状态时气缸内出现杂声(活塞敲缸)，主轴承或连杆轴承出现严重的振响或敲击响声。
6、 The engine makes abnormal noise or runs abnormally. When the engine is running in hot state, there is noise in the cylinder (piston knocking), and the main bearing or connecting rod bearing has serious vibration or knocking noise.
以上就是混凝土运输搅拌车发动机大修的条件，另外在有结冰可能的环境中使用，供水系统必 须排空存水，防止管路冻裂；经常检查系统的密封性，关键部位涂抹管路用密封胶。
The above are the conditions for the overhaul of the engine of the concrete mixer. In addition, when it is used in the environment with the possibility of freezing, the water supply system must be emptied to prevent the pipeline from frost cracking; the sealing of the system should be checked frequently, and the sealant should be applied to the key parts of the pipeline.
