One question: It is to inquire about the purchase time, purpose, and reason for sale of the diesel engine, the repair status, which main components have been replaced, and any problems encountered during use, in order to have a comprehensive understanding of the engine.

二看：就是看该机型是否属淘汰机型，再从外表看柴油机的新旧程度，后检查零部件是否齐全，有无损坏。

Secondly, it is to first check whether the model is an outdated model, then to see the degree of novelty of the diesel engine from its appearance, and finally to check whether the components are complete and undamaged.

三试：就是试机，柴油发电机组的具体方法是

Three tests: test the engine. The specific method of diesel generator set is

摇转曲轴，使喷油泵供油，如喷油嘴发出清脆的喷油声，说明柱塞副和喷油嘴性能尚好；如齿轮室内无异常声响，说明齿轮的磨损不严重。

Shake the crankshaft to supply oil to the fuel injection pump. If the fuel injection nozzle emits a crisp sound, it indicates that the performance of the plunger pair and fuel injection nozzle is still good; If there is no abnormal sound inside the gear compartment, it indicates that the wear of the gear is not severe.

上下晃动飞轮，如无响声、无明显晃动，说明曲轴主轴颈与轴瓦的间隙不大；转动飞轮，如无嗒嗒声，说明曲轴连杆轴颈与连杆瓦之间的磨损不严重。

Shake the flywheel up and down, if there is no sound or obvious shaking, it indicates that the clearance between the crankshaft main journal and the bearing shell is not large; If there is no clicking sound when rotating the flywheel, it indicates that the wear between the crankshaft connecting rod journal and connecting rod bearing is not severe.

使气缸减压，摇转曲轴，当拆除减压时，如活塞的反弹力大，飞轮迅速回转，说明气缸套、活塞、活塞环的磨损水平小。这时机油压力表读数应不低于1或机油压力指示红色浮标能很快升起，手压浮标应费力。

Depressurize the cylinder and rotate the crankshaft. When decompressing, if the rebound force of the piston is large, the flywheel rotates rapidly, indicating that the wear level of the cylinder liner, piston and piston ring is small. At this point, the reading of the oil pressure gauge should not be less than 1 or the red float indicating oil pressure can quickly rise, and manual pressure on the float should be laborious.

起动柴油机比较容易，排气无色或浅灰色，转速稳定，无杂音，则说明柴油机技术状态良好。

Starting a diesel engine is relatively easy, with colorless or light gray exhaust, stable speed, and no noise, indicating that the diesel engine is in good technical condition.

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