例1：一台东方红一802拖拉机发动机因烧机油进行修理后，很难起动。检修人员总认为是更换了新配件造成的。几个月来起动机因超负荷工作，损坏严重，连续大修了三次，缸体、活塞拜部进行了更换；同时高压柴油泵也进行了多次修理，提前角也进行了多次调整，仍无济于事。通过检查 Example 1: A Dongfanghong-802 tractor engine is difficult to start after the engine oil is repaired. Maintenance personnel always think it is caused by the replacement of new accessories. In the past few months, the starter was overloaded, causing serious damage and overhauling for three times in a row. The cylinder and piston were replaced. Meanwhile, the high-pressure diesel pump also repaired several times and the advance angle was adjusted several times. No use at all. Passed inspection