前言 拖拉机使用中,发动机燃料燃烧后的废气,在气缸压力与曲轴箱压力差的作用下,通过活塞—缸套组的间隙窜入曲轴箱,使曲轴箱压力升高,迫使润滑油沿各密封结合面渗漏和窜烧。降低曲轴箱内的气体压力是降低发动机 Preface Tractor use, the engine fuel combustion after the exhaust gas, the pressure difference between the cylinder pressure and the crankcase pressure through the piston-cylinder group fleeing into the crankcase clearance, the crankcase pressure increases, forcing the lubricant along the seal Leakage combined with leakage channeling. Lowering the gas pressure in the crankcase reduces the engine