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一台铁牛-55型拖拉机,起动机带不着主机。起动时,必须在主机空气滤清器内加注汽油,才能使主机强行起动。起动后,带负荷作业有异响。更换活塞、缸套、活塞环,故障仍未排除,同时发现该机下窜气严重。卸下气缸盖,摇转曲轴,当上止点定位螺钉插入飞轮轮缘上定位孔时,1、4缸活塞处于下止点,说明配气相位基准点错了,同时发现,缸套上端内孔壁上光亮无积炭。拆下正时齿轮室盖,慢转曲轴,当曲轴前端轴颈上的键槽处于垂直下
An iron cattle -55 tractor, starter with no host. At start-up, the main engine air cleaner must be filled with petrol to force the main machine to start. After starting, with a load of abnormal sound. Replace the piston, cylinder liner, piston ring, the fault has not been ruled out, at the same time found that the machine blow-by gas serious. Remove the cylinder head, rocking crankshaft, when the top dead center locating screw is inserted into the positioning hole on the flange of the flywheel, 1,4 cylinder piston at the bottom dead center, indicating the reference phase valve with the wrong point, and found that the upper end of the cylinder liner Hole wall bright without carbon. Remove the timing gear chamber cover and slowly turn the crankshaft. When the keyway on the front journal of the crankshaft is vertical