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一辆农用运输车上的290型发动机水温升高很快,经常发生“开锅”现象,功率明显下降,同时水箱内有大量气泡和机油漂浮。拆检发现第1缸气缸套上部有一轻微的纵向裂纹,已经裂至气缸套台肩顶部。这样,当发动机温度升高时,随活塞上窜的少量机油在高温高压气体的作用下,经裂
An agricultural transport on the 290 engine water temperature rise quickly, often “boil” phenomenon, power decreased significantly, while a large number of bubbles in the tank and oil floating. Inspection revealed that there was a slight longitudinal crack in the upper cylinder liner of cylinder 1 and had cracked to the top of the cylinder liner shoulder. In this way, when the engine temperature increases, with the piston channeling a small amount of oil in the role of high temperature and pressure gas, the crack