Re: What is Knurling valve guides?

Posted by Little Ed on September 26, 2005 at 19:21:12 from (64.136.164.35):

In Reply to: What is Knurling valve guides? posted by biggerred on September 26, 2005 at 15:16:50:

With the head off of the engine and the valve out, a tool that looks like a deep hole tap, but without the interruptions that would cut a chip, is lubricated and then run down the valve guide hole. The tool is spiraled like a bolt, but does not cut threads, instead it displaces the metal and thereby makes the diameter of the hole smaller. It is then reamed to the proper size according to the diameter of the valve stem + a clearance. The grooves that are left in the guide will actually hold more lubrication than a plain guide. I have pressed in new guides that already had been knurled from the factory, I assume (yes, I know the rule of assume) to provide an extra degree of lubrication.

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