从美国进口的ND5型机车 7FDL - 16型柴油机在我国已运用 15年之久 ,柴油机主要零部件破损事故有逐渐增多趋势。文中提供了该机车柴油机几年来连杆断裂统计表 ,指出连杆断裂的原因是由于制造过程中工艺缺陷造成某些部位应力集中 ,介绍了预防破损的措施。另外 ,对主轴瓦、排气总管、燃油预热器以及重要紧固件的破损及预防措施也作了介绍 The imported ND5 locomotive 7FDL - 16 from the United States has been used in our country for 15 years, and the main components of diesel engine have been gradually increasing. This article provides a statistics table of the connecting rod fracture of the locomotive diesel engine over the past several years. It points out that the reason of the connecting rod fracture is the stress concentration in some parts caused by the process defects in the manufacturing process, and the measures to prevent the damage are introduced. In addition, the main bearings, exhaust manifolds, fuel preheaters, and important fasteners, damage and preventive measures are also introduced