一问：就是询问柴油机的购置时间、用途及出售原因，修理情况和更换过哪些主要零部件，使用中有些什么问题等，以对该机有个比较全面的解。
The first question is to ask about the purchase time, purpose and sales reason of the diesel engine, the repair situation, the main parts replaced, and the problems in use, so as to have a comprehensive understanding of the engine.
二看：就是先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。
Second, it is to check whether the model is obsolete, and then to see the old and new degree of the diesel engine from the appearance, and finally to check whether the parts are complete and damaged.
三试：就是试机，柴油发电机组的具体方法是
Third test: test engine. The specific method of diesel generator set is
1.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。
1. Crank the crankshaft to make the fuel injection pump supply oil. If the fuel injection nozzle makes a crisp sound, it indicates that the performance of the plunger pair and fuel injection nozzle is good; If there is no abnormal sound in the gear room, it means that the gear is not seriously worn.
2.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。
2. Shake the flywheel up and down. If there is no noise or obvious shaking, the clearance between the crankshaft main journal and the bearing bush is not large; Turn the flywheel, if there is no click, it means that the wear between the crankshaft connecting rod journal and connecting rod bearing is not serious.

3.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。
3. Depressurize the cylinder and rotate the crankshaft. When removing the pressure relief, if the piston has a large rebound force and the flywheel rotates rapidly, it means that the wear level of the cylinder sleeve, piston and piston ring is low. At this time, the reading of the oil pressure gauge should not be less than 1 or the oil pressure indicator red buoy can rise quickly, and it should be laborious to press the buoy manually.
4.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。
4. It is easy to start the diesel engine, the exhaust is colorless or light gray, the speed is stable, and there is no noise, which means the diesel engine is in good technical condition.
通过以上方法，一般都能分辨出旧柴油机的优劣水平。一方面可以判断对方是否是翻新机在出售，另一方面如果是采购二手设备，也可以通过以上的辨别对旧柴油发电机组作价格的预估了
Generally, the advantages and disadvantages of old diesel engines can be distinguished by the above methods. On the one hand, we can judge whether the other party is selling the refurbished machine. On the other hand, if it is purchasing second-hand equipment, we can also estimate the price of the old diesel generator set through the above identification
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