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日产Ｄ８０Ａ－１２型推土机配置的是ＮＨ－２２０型发动机，该发动机机构紧凑，动力性能好，零件的耐磨性能好，使用寿命长，活塞、缸套等主要零件每年的磨损量小于０．０５ｍｍ，而影响发动机使用寿命原因是穴蚀。具体表现是：湿式缸套与冷却水的接触面，特别是活塞主推力面?
Nissan D80A-12 bulldozers are equipped with NH-220 engine. The engine is compact with good dynamic performance, good wear resistance and long service life. The annual wear of main parts such as piston and cylinder liner is less than 0.05mm , While the impact of engine life is due to cavitation. The specific performance is: Wet cylinder liner and cooling water contact surface, especially the piston main thrust surface?