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一台小四轮拖拉机的柴油机,气门摇臂折断。经仔细检查,发现机油压力指示器下部的泄油孔堵塞。由于该机型的气门及气门导
A small four-wheel tractor diesel engine, valve rocker broken. After careful examination, it was found that the lower part of the oil pressure indicator drain hole blocked. Due to the type of valve and valve guide