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Selection of lubricating oil
The lubricating oil should be selected strictly in accordance with the grades specified in the engine manual provided with the unit. The correct selection of lubricating oil is very important for the normal operation of the engine and the prolonged service life.
Lubricant selection is mainly based on API (American Petroleum Institute) quality classification and SAE (American Society of Automotive Engineers) viscosity classification. The quality grade of lubricating oil used in the engine should reach CD, CE grade (API). The lubricating oil viscosity adopts the internationally accepted SAE grade standard. Such as the brand of SAE15W/30 oil. Suitable for working environment temperature of -20℃～+25℃. The use of multi-grade oil can also extend the oil change interval.
When the ambient temperature is lower than the selected limit working temperature, it will affect the cold start of the engine, and when the ambient temperature is higher than the selected limit working temperature for a long time, it will cause early damage to the engine.
2. Use of coolant
The cooling system uses water as the cooling medium, and it should be prepared by using treated soft water and adding a certain proportion of antifreeze and preservatives. The use of soft water is to prevent the formation of scale in the cooling system and affect the cooling effect of the engine (PH6-8). Purified drinking water can generally be used in barrels.
Adding antifreeze to the cooling system can prevent the engine from being damaged at low temperatures. At the same time, under normal circumstances, the antifreeze also has an anti-corrosion function.
In areas where antifreeze is not required, anti-corrosion additives should be added to the coolant, which can greatly reduce the cavitation of the cylinder liner. But do not add anti-corrosion agent to the coolant that has been equipped with antifreeze to avoid a large amount of foam and reduce the effect of the coolant.
Both of these additives are harmful to the human body, so attention should be paid to safety.
3. Selection of fuel
The unit should use first-class and first-class light diesel oil that meets the national standard (GB252-87).
The main indicator of diesel quality is sulfur content. Sulfur content higher than 0.5% has a great impact on the service life of the engine and shortens the oil change cycle. Inferior oil products will have insufficient unit power, unstable speed, black smoke, serious carbon deposits, and knocks.
Diesel is usually selected based on the ambient temperature. Improper selection in cold areas may cause fuel to condense and cause difficulty in starting and running the engine.