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Join Date: May 2008
Location: UK
Posts: 128
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Valve guide tolerance
I just installed new valve guides in the heads for my 2.7.
If I want to check the tolerance, whats the reccomended tolerance between valvestem and valveguide?
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/Nimskov |
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06-21-2012, 03:49 AM
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My Haynes manual specifies the clearance as follows: Inlet .0011 to .0059 inches (.030-.15mm). Exhaust .0019 to .0078 inches (.050-.2mm). I don't know if these are new limits or wear limits.
-Andy
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72 Carrera RS replica, Spec 911 racer |
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06-21-2012, 12:35 PM
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That would be the valve adjustment clearances - not the clearance between valvestem and valveguide....
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/Nimskov |
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06-22-2012, 12:00 AM
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Location: So. Ca.
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intake .0016-.0019
exhaust .002-.0022 shoot for the high end if measuring is difficult specialty gauge pins are best used as a go no go |
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06-22-2012, 06:10 AM
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It looks like my Haynes numbers are both new spec and wear limit. They are not valve clearance numbers (that's .004 inches for both intake and exhaust).
-Andy
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06-22-2012, 09:21 PM
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Ok, thank you very much guys!
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06-23-2012, 01:02 AM
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