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1 问题的提出 2 0 0 3年以来,我们段中修的DF4B型机车多台发生柴油机排温高故障,特别是DF4 型92 2 7号机车,柴油机总管排温达到6 30℃,各支管排温均在5 5 0℃左右。为查找故障原因,我们对柴油机进行了全面检查,发现气门间隙、配气相位及供油提前角均在正常范围之内,只有压
1 Proposed Problems Since 2003, the DF4B locomotives repaired in our paragraph have suffered from high temperature exhaust of diesel engines. In particular, the DF4 type 92 2 7 locomotive and the diesel engine exhaust heat have reached a temperature of 630 ℃. The exhaust temperature of each branch Around 5 5 0 ℃. To find the cause of the malfunction, we conducted a comprehensive inspection of the diesel engine and found that the valve clearance, gas phase and fuel supply advance angle are within the normal range, only the pressure