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北京型机车长期强化使用，导致12V2402型柴油机机体裂损和变形急剧增加，危及安全运行。为了延长柴油机使用寿命，缓解机体紧缺的燃眉之急，北京铁路局对机体重要部位的裂损变形进行了修复。主要采用电弧气刨和高速电磨铣刀相结合加工主机·油道裂损部位和焊接坡口；用挖补改造焊接法及加强型主油道改造老结构；用自动准直仪和测微准直望远镜等装备和技术检测机体的变形量；用PC－1500A形位误差数据处理系统评定测量数据；用经削加工、涂镀及扩孔镶套法等加工主轴承孔及凸轮轴孔的形位公差。自1990年1月至1994年2月共修复12V2402型柴油机裂损变形机体35台。修复后的机体经验收符合和高于段修标准，装车后均配属在主干线上进行运行考核，早期修复的机体安全运行已超过一个架修期。在架修拆检中。机体原裂损经焊修的部位，探伤检查未发现新的裂纹，变形亦在段修范围内，达到了预期研究目标。
Beijing-locomotive long-term intensive use, resulting in 12V2402-type diesel engine body crack and deformation sharply increased, endangering the safe operation. In order to extend the service life of diesel engines and alleviate the pressing needs of the body, the Beijing Railway Administration has carried out repair and repair of cracks and deformations in important parts of the aircraft. The main use of arc gouging and high-speed electric milling cutter combination of processing host · oil crack site and weld groove; with welding and reinforcement of the main oil gallery to enhance the transformation of the old structure; with automatic collimator and micrometer Straight telescope and other equipment and technology to detect the deformation of the body; with PC-1500A form error data processing system to assess the measurement data; by cutting, coating and reaming set method such as the main bearing hole and camshaft hole shape Bit tolerance. From January 1990 to February 1994 a total of repair 12V2402 diesel engine damage deformation of the body 35. After the repair of the body of the experience received and higher than the paragraph repair standards, are loaded on the main line after the operation of the assessment, the early repair of the safe operation of the body has more than one shelf repair period. In the frame removal inspection. The body cracked original site by welding repair, testing did not find new cracks, deformation is also within the scope of repair, to achieve the expected research goals.