[TR] Sticking valves?

Randall tr3driver at ca.rr.com
Sat Sep 19 13:59:40 MDT 2009


> Can anyone check confirm the original TR2/3/4/4A?repair 
> manual specs for valve guides, especially on the exhaust side 
> (if it differs from the intake)?

TR2-3 factory workshop manual gives .001-.003" for intake, .003-.005" for
exhaust.  But that is for the 3/8" exhaust stems.

Note that the clearance is supposed to be built into the valve stem; the
target diameter for the guide is the 'nominal' diameter.  Thus intake guides
are 5/16" while intake stems are 5/16 minus .002" (the nominal clearance).
Exhaust guides are 3/8", while exhaust stems are 3/8" minus .004".  

Then all measurements are +/- .0005", giving the range of clearances.

My 4-4A Bentley gives the same numbers (and fails to mention the 5/16"
exhaust stems).

Randall


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