Posted by jdemaris on January 08, 2010 at 11:52:32 from (67.142.130.29):
In Reply to: setting valves posted by rocko on January 08, 2010 at 11:20:10:
Works different on different engines. Valve lash is what determines valve timing - that is the reason for proper adjustment going by the generalized factory setting that works "good enough" for all. It's also the reason why some engines run better when custom adjusted with a degree wheel and NOT to factory specs with a feeler gauge. Not very important on a farm tractor, but sometimes critical on race engines.
More to you point, like already said, if in doubt, do it over. I find that with most engines, when one valve is fully open, the other (closed valve) can be adjusted. I've double-checked that procedure against the factory procedure,and so far - it has always worked. That is, excpept for engines with cam-operated compression releases.
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