论文部分内容阅读
发动机定时齿轮室的各齿轮应按记号装配,但有时齿轮记号错乱或模糊不清,甚至新齿轮记号打错,则应按该机型的配气相和供油提前角来装配,以东方红-75拖拉机为例: 1.转动曲轴,使一缸活塞位于压缩行程上止点位置(发动机一般都有上止点定位销孔或刻线,如没有应看活塞)。 2.按凸轮轴工作时的转动方向转动凸轮轴,使一缸进气门刚打开,然后再慢慢转动,当四缸排气门刚关闭时立即停止转动。 3.装上定时齿轮室的惰轮,转动曲轴,复查气门的进气提前角和延迟角是否正确。检查方法有以下两种:
Engine timing gear chamber gear should be marked according to the assembly, but sometimes the gear mark is confused or ambiguous, or even a new gear mark wrong, it should be the model with the gas phase and fuel advance angle assembly, the East Red - 75 tractor as an example: 1. Turn the crankshaft so that a cylinder piston is at the top dead center of the compression stroke (the engine usually has a top dead center pin hole or notch, if no piston should be seen). 2. Turn the camshaft according to the direction of rotation when the camshaft is working, so that the one-cylinder intake valve just opens and then slowly rotates. When the four-cylinder exhaust valve just closes, it stops rotating immediately. 3. Install the idler gear in the timing gear room and turn the crankshaft to check if the intake air advance angle and retard angle of the valve are correct. There are two ways to check: