[AT] Misc - including a tractor question at the end!

[Richard Strobel]

I'll throw my two bits in Spence.  Clean, polish exposed valve stems as good 
as possible.  If you can see the valve stem housing's thru the exh/intake 
ports, get some heat in there and put it thru several heat/cool cycles.  If 
the valve has the two little holes on the back side (used for lapping), 
build a tool that will grip and try to turn it.  Your favorite penetrant 
will evaporate quickly with the heat.  I use a birthday candle and try to 
get the wax to flow between the stem and guide. It lasts longer.
  Heat/cool cycles have worked the best for me...second to that is complete 
submersion and use electrolysis.

Good Luck
RickinMt.