In the process of diesel generator, diesel engine oil will deteriorate due to water infiltration into the oil, diesel engine overheating, crankcase ventilation or poor gas resistance, diesel engine maintenance errors, etc. The oil has gone bad. You need to change the oil. How to replace? The following Xiaobian detailed introduction! Causes of deterioration of diesel generator oil
1. Oil seeps into moisture. Diesel will cause wet gas cylinder liner perforation, cylinder liner waterproof ring damage, oil radiator damage, cylinder gasket damage, cylinder head damage, etc. There is coolant in the oil, engine oil emulsification will deteriorate. Can be determined by whether the coolant is excessive consumption of water milk or whether the oil is replaced.
Poor crankcase ventilation and air resistance.
When a diesel engine starts, a portion of the combustible gas and exhaust gas always enters the gap between the crankcase piston ring and the cylinder wall. The piston ring is badly damaged, and this will be made worse. Fuel vapors that condense on the crankcase dilute the engine oil. Acid and water vapor in the exhaust corrode components at the same time that the engine gradually dilutes, heats or combines, reducing engine oil performance. The gas entering the crankcase also increases the temperature and pressure in the crankcase. The reciprocating motion of the piston of the oil seal and gasket oozing oil leads to the periodic change of air pressure in the crankcase, which affects the normal operation of the engine. In severe cases, the crankcase oil flows into the combustion chamber and cylinder head. Therefore, the diesel engine is especially equipped with ventilation holes, crankcase internal and external pressure balance, prolong the service life of oil. Crankcase vent failure or air resistance, oil oxidation and deterioration will accelerate.
3. The main causes of overheating of diesel engine are insufficient cooling water, excessive scaling of cooling system, interruption of cooling water circulation caused by pump failure, garbage blocking of radiator, radiator hood and thermostat, loose and damaged fan belt, long overload operation in high temperature season, influence of carbon accumulation in combustion chamber and insufficient oil in lubricating oil system. Diesel engine overheating, oil temperature rise, oil deterioration and deterioration accelerated. When the oil of diesel generator works under high temperature and high pressure, the anti-oxidation stability becomes worse, and the process of pyrolysis, oxidation and polymerization is carried out. At high temperatures, oil mixes with incomplete combustion products, condensed water vapor, and dust in the inhaled air, leading to accelerated deterioration of oil.
Diesel engines are improperly maintained
When the oil is changed, the diesel engine will be updated if the lubrication system is not cleaned, the crankcase is poorly cleaned, the oil filter or radiator is not completely cleaned, and the seal on the oil filter is missing
Diesel engines use gasoline.
The compression ratio of an oil engine is more than twice that of a gasoline engine. High temperature and pressure affect major components much more than gasoline engines, so some parts are made of other materials. For example, the main shaft and connecting rod metals for gasoline engines should be made of soft materials and corrosive Brinell alloys, and the metals for diesel engines should be made of high performance materials such as lead bronze and lead alloys, but these materials have low corrosion resistance.
Therefore, in the refining process of diesel oil, more preservatives must be added to form a protective film on the metal surface, reduce the corrosion of metal and improve the wear resistance. Gasoline does not have this preservative, so when added to diesel engines, the use of metal is prone to spot and sag, resulting in poor stripping consequences. Otherwise, the oil will immediately deteriorate and the lining and lock shaft may burn.
6. Different brands of oil mixed with different brands of diesel oil have other chemical components in addition to viscosity levels. This is mainly due to the different types and amounts of additives that make up the oil. In general, oil varieties and quality grades are classified by additive type and quantity component. Different kinds of additives have different chemical properties, can not be mixed with different additive types of oil. The additives in the oil react chemically, and the performance of the engine oil decreases sharply, which may deteriorate rapidly.
7. Improper use of oil brands
Because the type of diesel engine in operation, technical conditions and performance requirements are different, the required brand of oil is also different. The oil used in diesel engines
1. Comparison of the new oil and the old oil of the white filter paper. Do not change the oil when there are many black spots in the oil droplets used. If the oil is dark brown, it will spoil. Please change it.
2. Use a glass tube with a diameter of 0.5 cm and a length of 20 cm to inject 19 cm of new oil and used oil. After sealing, turn both tubes at the same time and record how long the bubbles rise. A difference of more than 20 percent means the viscosity of the oil used is too low and needs to be replaced.
Post time: Apr-26-2023