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(1)保证气门下陷量气门下陷量一定要控制在1.6～1.9毫米范围内,最大不超过2.5毫米。一台小拖拉机改造中忽视了这一要求,在气门下陷量小于1.6毫米的情况下进行了安装,机手又未能及时辨明气门撞活塞顶的响声,结果排气门将活塞顶部撞凹0.7毫
(1) to ensure that the amount of valve sag Valve sag must be controlled in the range of 1.6 ~ 1.9 mm, the maximum does not exceed 2.5 mm. A small tractor transformation ignored this requirement, the valve sag less than 1.6 mm under the installation was installed, the driver failed to identify the valve hit the top of the piston ring sound, the results of the exhaust valve will hit the top of the piston 0.7 concave concave