8-94396015-2 CAP VLV STEM END For ISUZU ZX200-3 4HK1 6HK1

The main function of the valve guide cover includes guiding function. The valve guide cover guides the movement of the valve to ensure that the valve can move back and forth in a straight line, thus ensuring that the valve and the valve seat ring can fit correctly. Heat dissipation, the valve guide cover can transfer the heat on the valve stem to the cylinder head, which helps to dissipate heat and prevent the valve from overheating. Lubrication: In order to ensure the lubrication performance of the valve, the valve guide cover usually uses materials with self-sliding performance, such as ductile iron or powder metallurgy materials, and is pressed into the valve guide seat hole through a certain amount of interference to prevent it from falling off. Fixation: In order to prevent the valve guide tube from loosening, some engines also use snap rings to fix and position the guide tube to ensure its stable operation. The structure of valve guide cover has two types: integral type and embedded type.