本文介绍了12V240ZJ型柴油机活塞与气缸套配合间隙由0.70～0.795mm改为0.50～0.595mm后,经四台柴油机台架试验,曲轴箱背压平均下降49Pa,均未发生气缸套窜机油现象;经过一个架修期运用后,缸套磨损量比缩小间隙前明显减小,缸套穴蚀轻微,从而防止了台架试验时缸套窜机油,也降低了运用中的机油耗量和噪声,延长了缸套的使用寿命。 This article describes the 12V240ZJ diesel engine piston and cylinder liner with 0.70 ~ 0.795mm clearance to 0.50 ~ 0.595mm after four diesel engine bench test, the average crankcase pressure drop 49Pa, did not occur channeling oil cylinder phenomenon; After a shelf repair period, the cylinder liner wear is significantly reduced than before the gap was reduced, cylinder liner cavitation slightly to prevent the test cylinder liner channeling oil, but also reduces the use of oil consumption and noise, Extended liner life.