Yuchai YC6A Series, Operation & Maintenance Manual

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3.6 冷却系统
Cooling System
冷却系统采用强制闭式循环水冷却系统，主要由散热器（水箱）、水泵、风扇、调温器、
机油冷却器、进出水管等零件组成（图 2—27 ）。
Cooling system uses a forced closed cycle cooling system. It includes radiator (water
tank), water pump, ventilating fan,thermostator, oil cooler and intake and exhaust water pipe.
(Fig 2-27)
散热器下部出水口通过水管接机油冷却器的进水口，机油冷却器出水口通过水管接水泵，
水泵将冷却液泵入气缸体水道，冷却液先经过气缸体内部的水套冷却气缸，然后向上流动冷却
气缸盖，再经出水总管汇集到达调温器处。当冷却液温度低于
70
℃ 时，调温器关闭，全部冷却
液旁通至水泵进口处，这时冷却液只在气缸体和气缸盖之间循环，可迅速暖车。当冷却液温度
达到
70
℃ 时，调温器开始打开，部分冷却液流向散热器上部进水口进入散热器，经散热风扇进
行冷却，当冷却液温度为
78
℃ 以上时，调温器全开，旁通孔关闭，全部冷却液经散热器冷却。
The lower water outlet of the radiator is connected to the water inlet of the oil cooler
through water pipe, and the oil cooler water outlet is connected to the water pump through
pipe. The water pump will send the coolant to cylinder block water path. The coolant will flow
through the water sleeve in the cylinder block to cool the cylinder, then the coolant will flow
upwards to cool cylinder cover and flow to the thermostator through water outlet. When the
coolant temperature is lower than 70
℃ , the thermostator shuts off, and all the coolant will
flow to water pump inlet, meanwhile, the coolant only circulates between cylinder block and
cover to warm up the engine rapidly. When the coolant temperature reaches 70
℃ , the
thermostator opens and partial coolant flows to the radiator through upper water inlet to cool
the radiator fan. When the coolant temperature is higher than 78
℃
, the thermostator fully
opens and the bypass hole close; all the coolant will be cooled down through radiator.