Check out this video, Dieselmeken explains how it works...there are 2 ways to time the pump, either matching a notch on the main shaft to a mark on the front end, or removing the timing plug and looking for the tab.
When you use the front mark it is 24 deg before TDC, when you use the tab, it is 15 deg after TDC.

https://youtu.be/WpAxhJDrYC4

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech