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一、禁止在拆下惰齿轮后转动曲轴或凸轮轴,以免顶坏气门、摇臂和活塞等零件。二、装配要求:气门杆靠两个半圆卡紧密地固定在气门弹簧座的锥形表面上,两个半圆卡的沉入差应不大于0.3毫米,气门弹簧座与气门杆间不允许有相对摆动。气门座研磨带为1.5～2毫米宽度。气门大头沉入气缸盖底面应不小于1毫米。气门研磨后,在安装气缸盖及气门机构后,必须检查当减压器处在关闭位置时,减压器轴和摇臂间是否有间隙,应有一定的间隙以保证在不减压时气门处于严密的封闭状态。三、调整凸轮轴的轴向间隙;
First, prohibit the removal of the idler gear crankshaft or camshaft rotation, in order to avoid the top bad valve, rocker and piston parts. Second, the assembly requirements: Valve stem by two semi-circular card tightly fixed on the conical surface of the valve spring seat, the two semi-circular card sinking should not exceed 0.3 mm difference between the valve spring seat and the valve stem is not allowed to have relative swing. Valve seat grinding tape width of 1.5 to 2 mm. Head sinking into the cylinder head bottom should be not less than 1 mm. After the valve grinding, after installing the cylinder head and the valve train, it is necessary to check whether there is a gap between the pressure reducer shaft and the rocker arm when the pressure reducer is in the closed position, and there should be a certain clearance to ensure that the valve In a tight closed state. Third, adjust the camshaft axial clearance;