我段从1976年开始对L207E柴油机活塞裂纹进行了运用调查.经过三年多的探讨,从中发现了一些规律,为今后开展裂纹活塞的使用提供了依据. (一)活塞裂纹的概况 1.活塞裂纹的基本情况据我段多年来的运用实践证明,L207E柴油机在运用中有的不足7万公里,最长也超不过20万公里,活塞就产生裂纹,同时下活塞裂 I paragraph from 1976 on the L207E piston piston cracking investigation conducted. After more than three years of exploration, from which we found some laws for the future use of cracked piston to provide a basis (A) Overview of the piston crack 1. Pistons The basic situation of cracks According to my paragraph over the years, the use of practice has proved that L207E diesel engine in use, some less than 70,000 km, the longest but also exceeded 200,000 km, the piston cracks, while the next piston cracking