Cold running in; Cold running in can be divided into two steps: non compression running in and compression running in. When non compression cold running in, remove the fuel injector; During compression cold running in, the fuel injector or pressure reducing structure shall be installed.

冷磨合时，要以外力带动自上料搅拌车发动机运转，整个过程不能有柴油供给，而且要随时观察机油压力，检查气门室内有没有润滑油流动，同时水温要控制在40℃，注意各部位有没有异常响声，如果有的话，要立即停机检查，排除故障。冷磨合后要放出磨合油，清洗整个的润滑油管路系统。

During cold running in, the engine of the self feeding mixer truck shall be driven by external force. There shall be no diesel supply in the whole process. In addition, the oil pressure shall be observed at any time to check whether there is lubricating oil flow in the valve chamber. At the same time, the water temperature shall be controlled at 40 ℃, and pay attention to whether there is abnormal noise in all parts. If there is any, stop the machine immediately for inspection and troubleshooting. After cold running in, drain the running in oil and clean the whole lubricating oil pipeline system.

无负荷热磨合；向自上料搅拌车发动机油底壳加入足量的清洁磨合油，检查调整气门间隙和供油提前角，排出燃油系统中的空气，然后启动发动机，在冷却系统水温达到40℃以上时，提高发动机转速，并随时注意发动机各缸的运转情况。

No load thermal running in; Add enough clean running in oil to the engine oil pan of the self loading mixer truck, check and adjust the valve clearance and oil supply advance angle, discharge the air in the fuel system, and then start the engine. When the water temperature of the cooling system reaches above 40 ℃, increase the engine speed and pay attention to the operation of each cylinder of the engine at any time.

负荷热磨合；稳定发动机转速，慢慢增加负荷，持续运转一个半小时，检查各部位是否有漏油、漏水、漏气等现象，水温、油压是否正常，自上料搅拌车发动机是否有异响或者异常。如果有及时熄火进行排查。自上料搅拌车发动机热磨合完毕后，应再次检查调整气门间隙，待发动机温度降低后，按规定力矩紧固气缸盖螺母。

Load thermal running in; Stabilize the engine speed, slowly increase the load, continue to operate for one and a half hours, check whether there is oil leakage, water leakage, air leakage and other phenomena at all parts, whether the water temperature and oil pressure are normal, and whether the engine of the self loading mixer truck has abnormal noise or abnormality. If there is, shut down the engine in time for troubleshooting. After the hot running in of the engine of the charging mixer truck is completed, the valve clearance shall be checked and adjusted again. After the engine temperature is reduced, tighten the cylinder head nut according to the specified torque.

优化调整；保证柴油机正确的配气相位，定期检查气门间隙，测量时要注意顺着摇臂方向插入厚薄规，只有正确调整气门间隙才能使气缸内限度的充满新鲜空气、排出废气，并且减少气门积碳。

Optimization and adjustment; Ensure the correct valve timing of the diesel engine, regularly check the valve clearance, and pay attention to inserting a thickness gauge along the rocker arm during measurement. Only by correctly adjusting the valve clearance can the cylinder be filled with fresh air, exhaust gas and reduce valve carbon deposition.

磨合期对于确保车辆运转状态，延长车辆使用寿命，排除故障隐患是非常重要的一个时期，尤其是负荷很大的自上料搅拌车，如果在磨合期内直接进行正常作业，很容易导致车辆各组件因为磨合不到位而出现各种故障，影响车辆的运转，所以在磨合期内一定不要满负荷运作，避免车辆受损。

The running in period is a very important period for ensuring the running state of the vehicle, prolonging the service life of the vehicle and eliminating hidden troubles, especially for the self loading mixer with large load. If the normal operation is carried out directly during the running in period, it is easy to cause various faults of various components of the vehicle due to poor running in, which will affect the operation of the vehicle. Therefore, do not operate at full load during the running in period to avoid damage to the vehicle.

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