(1) Valve leakage sound

气门漏气响在气门室外，在高负荷、低转速时较为明显，响声随负荷增加而增强，主要原因是在铰削气门座时，由于操作不当或气门导管内孔磨损过甚，使气门座歪斜或气门间隙小，致使气门烧蚀引起气门关闭不严而漏气响。

The sound of valve leakage occurs outside the valve chamber, and is more pronounced at high loads and low speeds. The sound increases with the increase of load, mainly due to improper operation or excessive wear of the valve guide hole when reaming the valve seat, which causes the valve seat to tilt or the valve clearance to be small, resulting in valve burning and causing the valve to close loosely, resulting in leakage sound.

处理方法：拆下气缸盖，研磨气门，检查气门弹簧弹力，重新调整气门间隙。

Solution: Remove the cylinder head, grind the valve, check the spring force of the valve, and readjust the valve clearance.

(2)气门敲击响

(2) Valve knocking sound

在发动机怠速运转时发生气门杆尾端与其驱动件之间发生连续不断的敲击声，随转速增大而增强，发动机温度改变或断火时声响无变化。

When the engine is idling, there is a continuous knocking sound between the end of the valve stem and its driving component, which increases with the increase of engine speed. The sound does not change when the engine temperature changes or the engine is cut off.

主要原因：

main cause:

1调整好的气门间隙有变动(锁止不牢、气门杆与驱动件之间磨损)，气门未调整好。

There is a change in the adjusted valve clearance (poor locking, wear between the valve stem and the driving component), and the valve is not adjusted properly.

2气门调整螺钉磨损，锁紧螺母松动，气门间隙过大或不一致。

2. The valve adjustment screw is worn, the locking nut is loose, and the valve clearance is too large or inconsistent.

3气门弹簧座磨损起槽，气门杆与导管磨损过甚。

3. The valve spring seat is worn and grooved, and the valve stem and guide tube are severely worn.

处理方法：重新调整好气门间隙，若调整螺钉上的锁紧螺母松动应予以锁牢，更换磨损严重的部件。

Treatment method: Readjust the valve clearance. If the lock nut on the adjustment screw is loose, it should be locked tightly and replaced with severely worn components.

(3)气门弹簧折断，应更换。

(3) The valve spring is broken and should be replaced.

(4)气门座响，座圈脱落

(4) Valve seat noise, seat ring detachment

气门座圈表面粗糙，加工精度不合格，座圈的过盈量选配不当造成松旷，选材不当遇热后变形过大，或气门座的镶配工艺不合要求。

The surface of the valve seat ring is rough, the machining accuracy is not qualified, the interference amount of the seat ring is improperly selected, resulting in looseness, improper material selection, excessive deformation when exposed to heat, or the installation process of the valve seat does not meet the requirements.

处理方法：按照装配工艺要求重新镶配气门座，上端面与体平面齐平，高出部分要修平。

Processing method: Reassemble the valve seat according to the assembly process requirements, with the upper end face flush with the body plane, and the higher part to be trimmed flat.