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Old 09-14-2010, 03:49 PM   #9
Art Bjornestad
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Join Date: May 2010
Location: Westlake Village, CA
Posts: 477
Default Re: Adjusting Model "A" Valves

There is a way to know just how many thousands to turn the tappet by figuring how many thousands a complete turn of the adjusting screw makes and then working out how much an 1/8th of a turn adds to the measurement. A quarter/20 nut does 20 revolutions in one inch of travel so 1 turn of the nut travels 50 thousands, an 1/8 turn just over 6 thousands. figure out what adjustment you need, make the adjustment at the bottom of the tappet travel and it should be spot on. You can do a 16th rev if you take a little time and get a 3 thou adjustment.
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