Spider, as you can see from the picture looks like a piece of metal debris basically dug a deep groove in the shuttle (I hope that picture came through) which I suspect caused it to get stuck, hence the high oil pressure build- thoughts and here’s another picture
https://imgur.com/a/7FDzkst
I did see that before, thanks.
First things first ! Get a known gauge on there !!!
While it's clear there has been something in there on the OPRV it may or may not have been jamming presently. Given the high pressures the pump can make, it will have still moved it off it's seat and in doing so, dropping the pressure in the Main Gallery, though, at lower speeds and when stationary, with the valve then moved out and if jammed, it would have remained un-seated and so you's see the issue the other way around to what you are seeing now.
Also, if it was that jammed up to make that kind of pressure, you would not have been able to remove the Valve, you would have needed at least an internal expanding tool or more likely, machine it out. At 120 PSI, there's around 36 pounds force on the Shuttle Valve, or put another way here, there would have been in excess of 36 pounds force jamming the Shuttle in place. I doubt you'd pull that out with your pinky and you'd struggle with most hand tools.
