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-   -   Valve guide tolerance (http://forums.pelicanparts.com/911-engine-rebuilding-forum/684797-valve-guide-tolerance.html)

nimskov 06-21-2012 03:49 AM
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?

Eagledriver 06-21-2012 12:35 PM
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

nimskov 06-22-2012 12:00 AM
That would be the valve adjustment clearances - not the clearance between valvestem and valveguide....

racing97 06-22-2012 06:10 AM
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

Eagledriver 06-22-2012 09:21 PM
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

nimskov 06-23-2012 01:02 AM
Ok, thank you very much guys! SmileWavy


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