| 摘要 |
A valve guide insert for placement in a valve guide of an internal combustion engine to guide a valve stem of the typical valve assembly while minimizing the valve insert wear. The valve guide insert may be a cast iron or other metal sleeve assembly having a port end and a spring end with a ring made of carbide, stellite, bonded metal or other wear-resistant material positioned inside the sleeve in the vicinity of the port end for engaging the valve stem during reciprocation. The ring can be a separate element retained within a recess of the sleeve, or a metal bonded onto a roughened portion of the sleeve and refinished to form a one-piece insert.
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