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在修理4125型发动机中,发现烧机油和窜机油现象比较普遍。原因有以下几个方面: 1.有些配厂生产的缸套精度、硬度、光浩度都达不到设计要求。装车运转时间不长就烧窜机油,有的在冷磨时就窜机油。凡缸套内壁产生轻重不同,宽窄不一、深浅不等的摩擦痕迹时,而其磨痕有的象花西瓜皮样的条状纹,有的呈螺旋纹形,间隔距离相等,很有规律;还有每隔三、四十毫米就有一条宽五、六毫米的亮痕,如这些条痕从缸口直通底部,机油就从擦痕之间窜上来了。另外,缸套的椭圆度超过0.06毫米、锥度超过0.03毫米也会窜机油。
In the repair of 4125 engine, found that burning oil and channeling oil phenomenon is more common. The reasons for the following aspects: 1. Some of the factory production of cylinder liner accuracy, hardness, Guanghao did not meet the design requirements. Loading running time is not long burning channeling oil, and some channeling oil in the cold mill. Where the cylinder wall with different weights, different widths, ranging from the depth of friction marks, and some wear marks like watermelon-like stripes, and some were spiral pattern, the separation distance is equal, a very regular There are also every three or forty millimeters there is a width of five or six millimeter bright marks, such as these streaks straight from the cylinder port through the bottom, the oil channeling between scratches up. In addition, the cylinder liner ovality more than 0.06 mm, taper more than 0.03 mm will channeling oil.