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1.故障现象1台柳工856型高原装载机配置的潍柴WD615型柴油机,大修后试车运转正常,但噪声略大。磨合5h后排气管烧红,并排出大量黑烟,接着Ⅱ缸气门室罩被打穿。将该柴油机立即熄火,拆开Ⅱ缸气门室罩,发现气门推杆已经弯曲,且从气门摇臂端头调整螺栓的凹槽内窜出,将气门室罩打坏。更换气门推杆及气门室罩,调整Ⅱ缸气门间隙后,转动柴油机曲轴。当曲轴转到某位置时被卡住,不能继续转动。打开排气管发现Ⅱ缸排气口有许多银白色粉末。打开Ⅱ缸汽缸盖,发现进气门烧断,活塞头部严重烧熔,如附图所示。
1. Symptom 1 Liugong 856 plateau loader Weichai WD615 diesel engine configuration, test run after overhauling normal, but the noise slightly larger. Running 5h after the exhaust pipe to burn red, and emit a large number of black smoke, followed by Ⅱ cylinder valve chamber hood was punctured. Immediately turn off the diesel engine, open the cylinder valve chamber cover II and found that the valve stem has been bent, and from the end of the valve rocker arm adjustment bolt sprang the channel, the valve room cover broken. Replace valve push rod and valve cover, adjust the cylinder valve clearance, rotate the diesel engine crankshaft. When the crankshaft to a position is stuck, can not continue to rotate. Open the exhaust pipe found that there are many silver cylinder exhaust port silver powder. Open the cylinder head cylinder Ⅱ, found that the intake valve is blown, the piston head serious burning, as shown in the figure.