A. Selection of fuel
Selecting proper fuel is very important and should be according to the environmental temperature the engine runs in. In the southern hot weather area, light diesel fuel with high cloud point is OK. In the cold northern area, light diesel fuel with low cloud point is necessary. For example, under ordinary ambient temperature, light diesel fuel of grade 0 or -10 is OK. In the south with high temperature, light diesel fuel of grade 10 is all right. And in the north with very low temperature, the light diesel fuel of grade -35 or lower is needed.
Water content and mechanical impurities in the diesel fuel must be as little as possible, or it possibly causes premature blockage of the fuel filter and rusting of the engine parts etc. Poor quality diesel fuel mixing water, kerosene, gasoline up is forbidden to be used.
Note: The fuel must be clean, it’s necessary to settle the fuel at least 7days or filter it through silk cloth in order to remove the mechanical impurities contained. The fuel without being settled or filtered is forbidden, otherwise, it may easily cause fuel supplying problems.
B. Selection for cooling water
As for cooling water for the engine, city supply water and clean river water is recommended. Well water and other underground water containing too much minerals should not be used, because scale will formed in the water jacket, affecting the cooling efficiency and thus causing engine fault.
When the engine is operated under the environmental temperature of lower than 0℃, special care must be taken to prevent some concerning parts from being damaged by frozen water. Therefore, please exhaust all the cooling water as soon as the engine stops.However, proper antifreeze can be added into the cooling system.
Note: 100% antifreeze can’t be used as cooling water.
Seawater can’t be used as cooling water directly.
If there is too much scale and dirt accumulated in the cooling system, it should be cleaned with cleaning solution, which can be made up in the proportion of 1L water, 40g soda and 10g sodium silicate.
When cleaning the cooling system, first fill the cleaning solution into the cooling water jacket, start the engine and let it run until the out let eater temperature exceeds 60℃,keep it running for about 2 hours, then stop the engine and drain off the cleaning solution. After the engine has cooled down, clean it with fresh water twice, then drain off the water, fill it with cooling water, start the engine again and let it run until the outlet water temperature exceeds 75℃, then stop the engine and drain off the dirty water. Finally, refill it with fresh cooling water for operation.