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去年秋天,我们在检修一台东方红—75型拖拉机时,发现该机配气凸轮轴齿轮有12个齿偏磨,其中有3个齿磨损较严重(约磨掉了1/3)。当时,正值小麦播种季节,为了保证农时,我们采取了齿轮翻转180°在原记号的对称处(以铅垂线为基准)重打记号并按记号装复的办法来解决。检修完毕后,把减压手柄放到预热位置上,摇转曲轴时却感发沉。当四缸进气门刚一打开并和排气门处于等高位置时,从飞轮监视孔中找不到定位孔,无法调整进排气门间隙。当把曲轴倒转
Last autumn, when we overhaul a Dongfanghong-75 tractor, we found that the camshaft gear of the machine had 12 partial teeth wear, of which 3 had more serious wear and tear (about 1/3 worn away). At that time, during the seeding season of wheat, in order to ensure agriculture, we adopted a method of reversing the gear by 180 ° at the symmetry of the original mark (on a plumb line basis) and placing the mark on the mark. After the overhaul, put the decompression handle to the preheating position, but when the crankshaft is cranky, it feels heavy. When the four-cylinder intake valve is opened and the exhaust valve is in the same position, the positioning hole can not be found from the flywheel monitoring hole and the intake and exhaust valve clearance can not be adjusted. Turn the crankshaft backwards