So I am having a loud tapping noise coming from my valve train I'm 85% sure. I can only think it is a bad lifter. I pulled them and cleaned them according to Mitsubishi repair manual cleaning them in diesel and leaving them pressurized then reinstalling them. They all would stay solid when cleaning them if i removed the pin releasing the check valve in them. So I figured that was how you knew if they were good or not. Is there any way these can stay solid but still collapse while in the car?

 

Bump as soon as the video finishes uploading I will tag it in this thread.