一个农机户买了一台旧的东方红-60型推土机,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,缸盖的第二、三缸气门座之间便出现了裂纹。是什么原因引起缸盖裂纹呢? 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1一2—4—3,二、三缸高 An agricultural machine buys bought an old Dongfanghong-60 bulldozer, 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, the cylinder head of the second and third cylinder valve seat Between the cracks there. What is the cause of cylinder head cracks? The original car just bought high-pressure pump camshaft is the first assembly, the order of injection of a 2-4-4, two, three-cylinder high