我们场一个家庭农场从农村买了一台东方红—75拖拉机,刚买来时技术状态尚好,后来因高压油泵出故障,经修理后,没工作几个班次,缸盖二、三缸气门座之间便出现裂纹。是什么原因引起缸盖裂纹的呢?原来这台车刚买来时高压油泵凸轮轴是调头装配的,喷油顺序为1—2—4—3。二、三缸的高压油管也是调换安装的。这次 We farm a family farm from the countryside bought a Dongfanghong -75 tractor, just bought when the technical status is good, and later because of the high pressure pump failure, after repair, did not work a few shifts, cylinder head two or three cylinder valve seat There will be cracks between. What causes the cylinder head cracks? The original car just bought high-pressure pump camshaft is the first assembly, injection sequence 1-2-4-3. Second, the three-cylinder high-pressure pipe is also replaced by the installation. this time