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12VESDZ30/55(简称12V300)柴油机是目前长江汉——申客轮主机(机型特点:二冲程、单作用、气阀——气口扫气,扫气活塞又起承受侧向力的十字头作用、废气涡轮定压型增压并带中冷),自1975年第一条东方红11号轮出厂至今已相继建造了16条。该种船舶船体线好,兴波阻力小,航速快,再加上载客多,设备好,深受旅客赞扬。但是,近年来陆续发现此种船舶主机的一些问题,其重大问题之一是缸盖和动力活塞的
12VESDZ30 / 55 (referred to as 12V300) diesel engine is currently the host of the Yangtze River Han - Shen passenger wheel (model features: two-stroke, single-acting, air valve-port scavenging, scavenging pistons and bear the crosshead role of lateral force, Exhaust gas turbocharger with constant pressure and with cold), since the first Dongfanghong 11 round of the factory in 1975 so far have been built 16. This kind of ship hull line is good, the wave resistance is small, fast speed, plus more passengers, good equipment, praised by travelers. However, in recent years, some problems of such ship’s main engines have been successively discovered. One of the major problems is that the cylinder head and the power piston