To identify the old and new levels of old diesel engines, one can take one, two, and three tests, and try to be the main method.
One question: It is to ask about the purchase time, use and reason of the diesel engine, the repair situation and the replacement of the main parts, and some problems in the use, so that the machine has a more comprehensive understanding.
Second look: First of all, whether the model is a eliminated model, and then look at the new and old degree of the diesel engine from the outside, and finally check whether the parts are complete, with or without damage.
Three trials: the test machine, the specific steps are:
1. Shake the crankshaft to make the fuel injection pump supply oil. For example, the injector emits a crisp sounding sound, indicating that the plunger pair and the injector have good performance; if there is no abnormal sound in the gear chamber, the gear wear is not serious.
2. If the flywheel is shaken up and down, if there is no sound, no obvious shaking, it means that the gap between the main shaft of the crankshaft and the bearing bush is not large; if the flywheel is turned, if there is no click, it means that the wear between the crankshaft connecting rod journal and the connecting rod is not serious.
3. The cylinder is decompressed and the crankshaft is cranked. When the decompression is removed, if the rebound force of the piston is large, the flywheel rotates rapidly, indicating that the degree of wear of the cylinder liner, the piston and the piston ring is small. At this time, the oil pressure gauge reading should be no less than 1 or the oil pressure indicates that the red buoy can rise quickly, and the hand pressure buoy should be laborious.
4. It is easier to start the diesel engine, the exhaust color is light or light gray, the speed is stable, and there is no noise, which indicates that the diesel engine is in good technical condition.
Through the above methods, it is generally possible to distinguish the advantages and disadvantages of the old diesel engine. In this way, it is more accurate to price the old diesel engine.
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