柴油机冷却水变黑的原因当柴油机冷却水变黑时，须仔细检查，认真分析原因，才能准确判断故障所在，以避免不必要的大拆卸。达到事半功倍的效果。当冷却水变黑，水中有明显的机油油膜，而且油底壳的机油面又会升高时，是由于阻水圈或缸垫水道孔与油道孔（挺杆孔）之间损坏... Diesel engine cooling black reasons Diesel engine cooling water black, it is necessary to carefully examine and carefully analyze the reasons in order to accurately determine the fault where to avoid unnecessary disassembly. Achieve a multiplier effect. When the cooling water is black and there is a distinct oil film in the water and the oil level of the oil pan rises again, it is due to damage between the water blocking ring or the cylinder head water channel hole and the oil channel hole (tappet hole). .