2013 Escalade with a collapsed lifter. Rocker cover removed and #4 intake rocker arm clearance is excessive (similar to your videos). Used the release tool with as many hits as I dared and even an air tool for rapid hits, but NO push rod flying out.
I was about to give up when I noticed the push rod was now obviously sitting 1/2" or so higher than before. So I reinstall the rocker arm and sure enough the tappet clearance is now zero. It appears the lifter released, just not spectacularly.
Rotated the engine manually through several cycles and the push rod/rocker valve are moving through the normal cycle. It appears the problem is fixed, but I am really hesitant to reassemble everything out of fear this is fool's gold.
Of course, I worry that as soon as power is applied, (even with the VLOM delete) the lifter will collapse under its own "push".
Is there a way, to manually check that push rod to confirm the lifter is actually released and has locked itself in place?
Many thanks for the help!
Got it, thanks. I will report back so others can know.
Yes, you can use the starter relay to verify if it worked. Make sure you have the VLOM on and the oil sensor installed. At bare minimum bolt the bolts down on the VLOM just by the oil sensor. Then jump the starter relay making sure NOT to hook the wires up wrong. You could damage the ECM if you don't hook it up correctly. Feel free to unplug the ECM if it's not unplugged already to be sure. Then while the engine is cranking watch the rocker arm for the lifter that was collapsed. If the rocker arm is able to move six or seven times without stopping while you're cranking you should be good to go. At that point it's time to reassemble.