Re: valve guide failure

Posted by Owen_Dyneto On 2012/10/19 9:52:36

In addition to JD' suggestion, when you installed the guide did you then use a valve seat refacer to regrind the seat using the new guide as a center? That's a must when changing guides to insure the seat and centerline of the guide are concentric with each other. If not, unless they happened to be ooncentric to begin with, the valve can "cant" as it comes down, pushing the stem sideways, and very rapidly wear the guide to an egg-shape and possibly also bend the valve face on the stem.