The factory manual refers to the act of removing the pump, re aligning the marks on the pump and then re installing the pump so that it is in the center of it's range (Engine positioned at 24BTDC) as "Displacing the pump."


I must have gotten something wrong when I did this last as I was not able to achieve the correct start of injection setting.
The first time I had to do this it worked fine, most recently not. Not sure what the difference was, but I'm going to have to try again.