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Reasonable Time for Diesel Generator Oil Replacement

Dec. 07, 2021

When we use diesel generators, we will find that sometimes the engine oil turns black after the new engine oil of the diesel generator has not been working for a long time. So what are the reasons for the blackening of diesel generator oil? Below, the Starlight Power Generation Equipment will answer your questions.


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1. Reasons for the blackening of diesel generator oil


(1) When changing the oil, whether the lubricating oil tank and oil passage of the diesel generator have been cleaned. If it is not cleaned, its residue will contaminate the new oil.


(2) It can be observed whether the fuel is fully burned when the diesel generator is working, whether the piston, piston ring and cylinder block are worn too much, and the seal is not tight. If the fuel is fully burned, the exhaust gas entering the lubricating oil tank will quickly turn the lubricating oil into black and thick.


(3) The oxidation of engine oil is a measure of whether it can be stable at high temperatures, and it is determined by the temperature of the engine oil, the oxidation induction period of the base oil and antioxidant additives.


(4) Whether the lubricating oil meets the requirements for use. High-temperature, high-speed, high-load diesel generators should use lubricating oil with good oxidation stability and good additive quality. The use of poor quality oil will quickly deepen the oil color and turn black.


2. The effect of engine oil blackening


The engine oil turns black, indicating that the engine oil contains excessive impurities, such as extremely small metal cutting particles, carbon deposits, etc. These impurities are transported to the friction surfaces that need to be lubricated during the operation of the diesel engine, which will cause serious secondary wear on the parts. The consequence is to destroy the normal size, structure and fit clearance of the mechanical parts, and affect the service life of the diesel engine; in severe cases, it will cause the metal to melt between the crankshaft/connecting rod and the piston/cylinder liner of the diesel engine due to the rapid wear and tear. It causes adhesion of the metal surface, and malfunctions such as axle holding and pull-out.


3. How to determine the replacement time of diesel generator oil


(1) Use two glass test tubes with a diameter of 0.5 cm and a length of 20 cm, respectively, into 19 cm of new engine oil and used engine oil. After sealing, the two tubes are turned upside down at the same time, and the time when the bubble rises is recorded. If there is a difference between the two When it exceeds 20%, it means that the viscosity of the used oil has dropped too much and should be replaced.


(2) Compare the new engine oil and the used engine oil with one drop each on the white filter paper. If there are more black spots in the used oil drop, it indicates that the engine oil has not deteriorated and should not be replaced; if the engine oil is dark brown, then In order to deteriorate, it should be replaced.


(3) Different manufacturers and different power diesel generators use different oils, so when you buy a diesel generator, you must ask the manufacturer what kind of oil the unit uses.


In summary, the reasons for the blackening of the diesel generator oil are: when changing the oil, the diesel generator lubricating oil tank and oil passages are not cleaned, the fuel combustion is not sufficient when the diesel generator is working, the oil is oxidized, and the lubricating oil is not in compliance. Use requirements, etc. The blackening of the engine oil will destroy the normal size, structure and fit clearance of the machine parts, and affect the service life of the diesel generator. Therefore, we must choose qualified oil products, clean and maintain them regularly, so as to reduce the occurrence of similar failures.


As a professional diesel generator manufacturer, we always insist on using first-class talents to build a first-class enterprise, create first-class products, create first-class services, and strive to build a first-class domestic enterprise. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.

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