一台武林牌农用车,工作不到200小时,该车发动机就突然冒黑烟,机油油面升高。经检查,发现机油里有柴油,使油面升高。在排除了高压油泵及输油泵有内漏的可能性后,又经仔细检查,发现该车发动机为395Q型柴油机,吸气管上安装有电流式火焰预热器,预热器油管接在回油管上,在工作中,油管内的柴油始终存在一定的压力。拆下预热器检查, A Wulin brand agricultural vehicles, less than 200 hours of work, the car suddenly black smoke engine, oil surface increased. After inspection, found in the diesel oil, so that the oil surface. After excluding the possibility of internal leakage of high-pressure oil pump and oil pump, after careful examination, it was found that the engine of the vehicle was a 395Q diesel engine, and the current-collecting flame preheater was installed on the suction pipe. The preheater oil pipe was connected back Tubing, at work, there is always pressure on the diesel within the tubing. Remove the preheater inspection,