例1 一台T-28拖拉机在工作中功率渐渐下降。由于刚大修出厂,更换了缸套和活塞,研磨过气门等,大修后功率发挥也正常。但工作不久就发现功率下降,并有一怪异现象:原来功率足时,拖5吨煤上坡要冒黑烟,但仍可爬上坡。可现在拖5吨煤上坡不冒烟,但也爬不上坡。检查压缩压力很大, Example 1 A T-28 tractor is gradually declining in power during operation. As just overhaul the factory, the replacement of the cylinder liner and piston, grinding valve, overhaul after the power play is also normal. However, shortly after work, we found that the power dropped and there was a weird phenomenon: when the power was enough, dragging 5 tons of coal up the slope for black smoke would still climb the slope. Can now drag 5 tons of coal on the hill does not smoke, but also climb uphill. Check the compression pressure is great,