This is cylinder head where the valve guide has become loose in the head and the guide hole no longer provides enough of an interference fit to securely hold the guide. Using our new State of the Art Rottler Seat and Guide machine we repair this by machining up a centering sleeve and using this to allow us to ream a larger concentric hole. We then custom machined a new guide from Ampco 45 that gives us a .04mm interference fit. The guide is cooled and the head warmed up to install the the new guide. After sizing the id to fit the valve we will recut the valve seat.
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AuthorI have been involved in mechanics and motorcycling from a young age. I formed Cycle Improvements in 1981 and still have the same passion to learn today as when I started. Hope you find this blog interesting and educational. Archives
March 2021
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