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Ford 9N, 2N & 8N Discussion Board

Re: Valve replacement


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Posted by ASEguy on November 09, 2012 at 20:30:54 from (68.186.162.134):

In Reply to: Re: Valve replacement posted by Bulldozer on November 09, 2012 at 19:58:45:

Stepped valve stems? That is considerable wear. In automotive use .001 isn't uncommon for older engines. Newer Stellite guides usually don't exibit much wear at all from my experience. With stem wear so high pay close attention to the valve guide wear. OHV engines usually show hourglass wear in the guide from rocker action. This translates into valves not seating concentric with the bore and flexing of the head which can lead to failure. There are ways to repair the guide if this will be a hard working tractor. Reaming and knurling will restore original size, but not original condition. Bronzewell guides are a great investment for a long term repair, but are pricey. Valve to guide oil clearance is very important, probably more so in automotive. Gerard


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