柴油发电机组启动前要加注冷却液。加注时，应翻开发动机上部冷却体系的放气阀门，缓慢地将冷却液从散热水箱的加水口加入到发动机中，直至没有气泡再从放气阀门中排出停止。冷却液应加注至散热水箱加水口颈部下方，不宜过满。加注结束后，将放气阀门封闭，并将水滤器装置座上的截门翻开，以便DCA4添加剂能够混合进入冷却体系中。冷却体系所用冷却液主要应由纯净水、防冻液及DCA4添加剂3种成分构成，每升冷却液含50％的纯净水、50％的防冻液和0．5单位的DCA4添加剂。配好的冷却液一年四季均可运用，而且能够接连运用两年。
纯净水因为经过净化，因而可避免形成水垢发电机组防冻液系指工业用的乙烯乙二醇或丙烯乙二醇，能够下降水的冰点及进步水的沸点。防冻液的浓度应为40％。68％，浓度过高或过低均会影响冷却液的防冻能力。在大多数气候条件下，引荐运用的防冻液浓度为50％，此刻冷却液的冰点可达—33cC。DCA4添加剂可在水体系内外表形成一层保护膜，以避免缸套和机体发生穴蚀及阻挠沉淀物堆积。康明斯C系列以上的发动机都安有水滤器，水滤器除了有过滤介质外，内部还含有DCA4添加剂。DCA4添加剂的浓度通常要求坚持为每升水中含有0.32～0.79单位，能够经过DCA4检测包来检测。
Before starting the diesel generator set, it is necessary to add coolant. When adding fuel, the vent valve of the upper cooling system of the engine should be opened, and the coolant should be slowly added from the water inlet of the radiator to the engine until there are no bubbles before being discharged from the vent valve. The coolant should be added to the neck of the radiator water inlet and should not be overfilled. After filling, close the vent valve and open the shut-off valve on the water filter device seat so that DCA4 additive can mix into the cooling system. The coolant used in the cooling system should mainly consist of three components: pure water, antifreeze, and DCA4 additive. Each liter of coolant contains 50% pure water, 50% antifreeze, and 0.5 units of DCA4 additive. The prepared coolant can be used all year round and can be used continuously for two years.
Purified water can avoid the formation of scale due to purification. Antifreeze for power generation units refers to industrial ethylene glycol or propylene glycol, which can lower the freezing point of water and increase the boiling point of water. The concentration of antifreeze should be 40%. 68%, high or low concentration will affect the antifreeze ability of the coolant. In most climatic conditions, the recommended concentration of antifreeze is 50%, and the freezing point of the coolant can reach -33cC at this moment. DCA4 additive can form a protective film on the inner and outer surfaces of the water system to prevent cavitation and hinder sediment accumulation in the cylinder liner and body. Cummins C-series and above engines are equipped with water filters, which not only contain filtering media but also DCA4 additives inside. The concentration of DCA4 additive is usually required to be 0.32-0.79 units per liter of water, which can be detected by the DCA4 detection kit.
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