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1984年至1985年引进了26台意大利佩尔利尼DP655B型矿用自卸汽车,该车载重量为50t,采用美国通用汽车公司GM12V—92TA柴油机。从投产运行到第一次大修普遍行驶了8000h以上,有6台车达到12000h。但是经过近三年的使用,发动机开始出现炸缸盖现象,据不完全统计,从1986年至今已炸裂百余块,直接经济损失25万余元。DP655B型汽车是V型12缸,有4个合金铸铁的气缸盖,每个缸盖有3个燃烧室,12个气门。理论上说,压缩比愈大,压缩行程终了时混合气体的压力和温度愈高,混合气体的燃烧速度也愈快,柴油机混合气体形成和燃烧是在燃烧室内进行。所以柴油机缸盖
From 1985 to 1985, 26 Peilini DP655B dump trucks were imported from Italy. The vehicle weight was 50 tons and GM GM12V-92TA diesel engine was used. From the operation to the first overhaul of the general over 8000h, 6 car reached 12000h. However, after nearly three years of use, the engine started to appear a cylinder head cover phenomenon. According to incomplete statistics, it has blown more than 100 blocks since 1986 and has a direct economic loss of 250,000 yuan. Model DP655B is a V-12 cylinder with 4 cast iron cylinder heads, each with 3 combustion chambers and 12 valves. In theory, the larger the compression ratio, the higher the pressure and temperature of the mixed gas at the end of the compression stroke, and the faster the combustion speed of the mixed gas. The formation and combustion of the diesel mixed gas are performed in the combustion chamber. So diesel engine cylinder head