1 故障及检查我场有3台东方红-802型拖拉机严重下排气,从通气孔排机油,每个班次耗机油3～4千克。检查情况如下: 首先拆下缸盖,抽出活塞。进气门下陷量3.2毫米;缸筒最大磨损量为0.71毫米,最小磨损量为0.32毫米,普遍为三、四缸严重,一、二缸较轻;活塞环开口间隙为2.5～3.0毫米;吸气支管内表面附有一层机油。其次检查空气滤清器,发现油盘里的机油少了1/3, 1 failure and inspection I have 3 red-802 tractor serious exhaust, from the vent row of oil, oil consumption per shift of 3 to 4 kg. Check the situation is as follows: First remove the cylinder head, remove the piston. Intake valve sag 3.2 mm; cylinder maximum wear 0.71 mm, the minimum wear of 0.32 mm, generally three, four serious cylinder, a lighter two-cylinder; piston ring opening gap of 2.5 to 3.0 mm; suction Gas pipe with a layer of surface inside the oil. Second check the air filter and found less oil in the oil pan 1/3,