一問：就是詢問柴油機(jī)的購置時(shí)間、用途及出售原因，修理情況和更換過哪些主要零部件，使用中有些什么問題等，以對該機(jī)有個(gè)比較全面的解。
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：就是先看該機(jī)型是否屬淘汰機(jī)型，再從外表看柴油機(jī)的新舊程度，后檢查零部件是否齊全，有無損壞。
Second, it is to check whether the model is obsolete, and then to see the old and new degree of the diesel engine from the appearance, and finally to check whether the parts are complete and damaged.
三試：就是試機(jī)，柴油發(fā)電機(jī)組的具體方法是
Third test: test engine. The specific method of diesel generator set is
1.搖轉(zhuǎn)曲軸，使噴油泵供油，如噴油嘴發(fā)出清脆的噴油聲，說明柱塞副和噴油嘴性能尚好；如齒輪室內(nèi)無異常聲響，說明齒輪的磨損不嚴(yán)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.上下晃動(dòng)飛輪，如無響聲、無明顯晃動(dòng)，說明曲軸主軸頸與軸瓦的間隙不大；轉(zhuǎn)動(dòng)飛輪，如無嗒嗒聲，說明曲軸連桿軸頸與連桿瓦之間的磨損不嚴(yán)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.使氣缸減壓，搖轉(zhuǎn)曲軸，當(dāng)拆除減壓時(shí)，如活塞的反彈力大，飛輪迅速回轉(zhuǎn)，說明氣缸套、活塞、活塞環(huán)的磨損水平小。這時(shí)機(jī)油壓力表讀數(shù)應(yīng)不低于1或機(jī)油壓力指示紅色浮標(biāo)能很快升起，手壓浮標(biāo)應(yīng)費(fèi)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.起動(dòng)柴油機(jī)比較容易，排氣無色或淺灰色，轉(zhuǎn)速穩(wěn)定，無雜音，則說明柴油機(jī)技術(shù)狀態(tài)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.
通過以上方法，一般都能分辨出舊柴油機(jī)的優(yōu)劣水平。一方面可以判斷對方是否是翻新機(jī)在出售，另一方面如果是采購二手設(shè)備，也可以通過以上的辨別對舊柴油發(fā)電機(jī)組作價(jià)格的預(yù)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
以上的精彩內(nèi)容由沼氣發(fā)電機(jī)組進(jìn)行推薦閱讀，想要知道更多有用的知識(shí)，歡迎點(diǎn)擊：http://m.dgtmcnc.com。
The above wonderful contents are recommended for reading by biogas generator units. If you want to know more useful knowledge, please click: http://m.dgtmcnc.com 。