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For a water-cooled engine, radiator performance has a direct impact on automobile engine heat dissipation effect, influence the automobile's power performance, economy and reliability. Based on the 6DL engine high temperature problems are investigated, analyzed the reasons of high temperature of the engine coolant radiator, developed three sets of technical improvement scheme, through testing, comparison, comprehensive consideration of technology, economy and other factors, determines the transformation scheme of aluminum radiator. Introduction As much more compact design and larger unit volume power adopted for modern automobile engine, the enhancement degree become higher and higher, and the density of heat flow occurred by engine is also increased obviously. At present, almost the reinforcement of all engines are faced with how to resolve the cooling and heat balance problem under high power density. The engine cooling system of heavy vehicle needs to meet the supporting requirement of whole vehicle in spite of maintaining the needs of engine itself. Due to the limit of structure arrangement, the design and installation of cooling element often can not reach the ideal status. As the supporting performance is not good, and the cooling capacity can not well adapt to the working condition and climate, high water temperature or even “Boil” phenomenon is usually happened. Therefore, the system element must be matched with the whole vehicle, especially radiator and fan. Moreover, the wind resistance of radiator element shall be small, and the high speed air flow shall be enough with higher heat exchange efficiency. To develop effective and reliable cooling system has become a key technical problem to increase power and improve economy of engine. Investigation of high water temperature of diesel engine Technical parameter of 6DL engine. The model of diesel is CA6DL1-28, which has several types, such as 6 cylinders, straight, direct injection, supercharged and charge air cooling. The main technical features are high power, covers 191-235kW(260-320Ps), which can meet the requirement of current mainstream of heavy vehicle; long lifetime; low discharge (which can meet the requirement of European II and III, with potential of European IV ); Low oil consumption (the minimum oil consumption is 193/kW.h) and low noise (noise of whole vehicle: 96.5dB (A). The requirements of engine working temperature are as follows: Normal working water temperature 80~100°C Optimal working water temperature 90~95°C Highest working water temperature limit 105~107°C 2. Investigation of high water temperature of 6DL engine Area of vehicle Main problems of engine cooling system 2nd International Conference on Advances in Mechanical Engineering and Industrial Informatics (AMEII 2016) © 2016. The authors Published by Atlantis Press 78

Research on high water temperature of diesel engine and improvement of radiator