PTV clearence issues
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#49
So if I was using a lifter that was fully pumped with checker springs to find PTV clearence my first test that's like adding length to the pushrod since the lifter didn't take any preload. That would make the valve open way more ?
#50
You could probably successfully check the valve clearance with checker springs if you used an adjustable pushrod set at 0 lash. That is about the only way but, using a hydraulic lifter still adds a variable and some uncertainty.
#51
checker springs with a full length pushrod would add whatever preload you have build into the pushrod measurement (assuming the lifter does not plunge). I measure using checker springs, a solid lifter, an adjustable pushrod set at zero lash and a dial caliper sitting on top of the retainer. this pic was playing around watching the base circle. it's really not necessary to use the gauge for base circle. stick your thumb into the pushrod and rotate motor and stop when the pushrod reaches the lowest point. use a junk gasket, snug down the head bolts, snug down a rocker at zero lash and mount the caliper onto the retainer like I have it on the pushrod. make sure to try and match the angle of the valve. rotat motor 2* at a time and push the rocker down and watch the caliper. it will eventually give you exact PTV measurements without playdough sticking to your valve, or falling off of the piston.
Last edited by TXsilverado; 03-30-2015 at 08:20 PM.