Quote:
Alan,
I know many people use this method for checking ptvc, but when you open the valve using the rocker arm to find the clearance you basically take all of the load off of the pushrod and lifter which doesn't account for any pushrod flex. Seems to defeat the purpose of checking the clearance in an as run situation. I do realize that the larger diameter and thicker wall pushrods would have minimal flex. Just a thought.
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Well, by ignoring the pushrod flex, you actually end up being conservative on your clearance. If the pushrod flex reduces lift,then you actually have more clearance.
Also, you zero the dial indicator BEFORE taking each measurement, so the measurement is taken from the point of the pushrod being loaded.