Methods to Judge Diesel Generator Lubricating Oil Deterioration
Oil flow observation method. Take two measuring cups, one of which is filled with the lubricating oil to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted to let the lubricating oil to slowly flow to the empty cup, observe the flow, good quality lubricating oil flow should be slender, uniform, and continuous. If the oil flow is quick and slow, and sometimes there is a large flow, then the lubricant has deteriorated.
Illumination method. On a sunny day, lift up the the lubricating oil with a screwdriver at a 45-degree angle to the horizontal. Observe the oil droplets under sunlight. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can continue to work. If there is too much wear debris, the lubricant should be replaced.
Oil drop trace method. Take a clean white filter paper, and drop a few drops of oil on the filter paper. After the oil leaks, the good lubricant has no powder, and it is dry and smooth by hand, and it has yellow marks. If there is a black powder on the surface, and there is a feeling of resistance by hand touch, it means that there are many impurities in the lubricating oil, and new lubricating oil should be replaced.
Hand twist method. The lubricating oil is repeatedly ground between the thumb and index finger. The better lubricating oil hand feels lubricated, less wear debris, no friction. If you feel a large friction between fingers, it indicates that there are many impurities in the lubricating oil and can not be reused, should be replaced with the new lubricating oil.
What is the cause of engine oil deterioration? The five main reasons for the rapid deterioration of engine oil are as follows:
1. The oil grade is wrong and the quality is not up to standard. Generally, Cummins diesel generator with supercharged and rated speed greater than 2000r/min should use oil of class CC or above.
2. The technical condition of generator set is not good, gas channelling, oil channelling, the matching clearance is too large or the oil temperature is too high.
3. Generator set often runs at low temperature, low load and low speed, the piston deformation is not enough, and the combustion is not good. The diesel oil enters the oil sump along the cylinder wall to make the oil dilute and deteriorate.
4. The exhaust gas enters the oil sump and condenses into moisture and acidic substance, which deteriorates the oil.
5. The oil filter element is dirty, and the unfiltered dirty oil enters the lubrication part, which also accelerates the wear of the generating set parts.