WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Oil Pump Stop Lugs
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove the four oil pump screws
Remove the oil pump.
Use a groove-cut chisel and carefully
break at the stop lugs