How to identify the old and new diesel generator sets?
2022-07-22
In the procurement of generator sets, many customers are most afraid of identifying the old and new equipment, which is also where everyone is easy to be cheated. So here, Raines has sorted out some recognition skills. You may as well have a look.
According to the experience of some technicians and old engine operators, the method of "one ask, two look, three try" can be adopted to identify the old and new degree of the old diesel engine.
First question: it is to ask about the purchase time, purpose and sale reason of the diesel engine, the repair situation, which main parts have been replaced, and what problems exist in use, so as to have a more comprehensive understanding of the engine.
Second, we should first check whether the model is obsolete, then look at the old and new degree of the diesel engine from the appearance, and finally check whether the parts are complete and damaged.
Three tests: the specific methods of commissioning the diesel generator set are as follows:
1. Rotate the crankshaft to make the fuel injection pump supply oil. If the fuel injection nozzle emits a crisp fuel injection sound, it indicates that the plunger pair and fuel injection nozzle have good performance; If there is no abnormal sound in the gear chamber, it indicates that the wear of the gear is not serious.
2. Shake the flywheel up and down. If there is no sound or obvious shaking, it indicates that the gap between the crankshaft main journal and the bearing bush is not large; Rotate the flywheel, if there is no click, it means that the wear between the crankshaft connecting rod journal and connecting rod bush is not serious.
3. Reduce the pressure of the cylinder and rotate the crankshaft. When removing the pressure reduction, 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 time, the reading of the oil pressure gauge should not be lower than 1 or the red buoy indicating the oil pressure can rise quickly, and the manual pressure buoy should be laborious.
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 indicates that the diesel engine is in good technical condition.
Through the above methods, we can generally distinguish the old and new levels of old diesel generator sets. In this way, it is more accurate to make a purchase judgment. In addition, we must be wary of equipment that is too low-cost, choose carefully and identify carefully.
According to the experience of some technicians and old engine operators, the method of "one ask, two look, three try" can be adopted to identify the old and new degree of the old diesel engine.
First question: it is to ask about the purchase time, purpose and sale reason of the diesel engine, the repair situation, which main parts have been replaced, and what problems exist in use, so as to have a more comprehensive understanding of the engine.
Second, we should first check whether the model is obsolete, then look at the old and new degree of the diesel engine from the appearance, and finally check whether the parts are complete and damaged.
Three tests: the specific methods of commissioning the diesel generator set are as follows:
1. Rotate the crankshaft to make the fuel injection pump supply oil. If the fuel injection nozzle emits a crisp fuel injection sound, it indicates that the plunger pair and fuel injection nozzle have good performance; If there is no abnormal sound in the gear chamber, it indicates that the wear of the gear is not serious.
2. Shake the flywheel up and down. If there is no sound or obvious shaking, it indicates that the gap between the crankshaft main journal and the bearing bush is not large; Rotate the flywheel, if there is no click, it means that the wear between the crankshaft connecting rod journal and connecting rod bush is not serious.
3. Reduce the pressure of the cylinder and rotate the crankshaft. When removing the pressure reduction, 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 time, the reading of the oil pressure gauge should not be lower than 1 or the red buoy indicating the oil pressure can rise quickly, and the manual pressure buoy should be laborious.
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 indicates that the diesel engine is in good technical condition.
Through the above methods, we can generally distinguish the old and new levels of old diesel generator sets. In this way, it is more accurate to make a purchase judgment. In addition, we must be wary of equipment that is too low-cost, choose carefully and identify carefully.