I did a search and am still confused of the location of the Oil Pressure Relief Valve. One part accessed immediately adjacent to the oil presure sending unit (vertically) seems not to be able to clear the power steering bracket when trying to remove it. The other part is mounted on the oil cooler (horizontally) into the engine block. I have been unable to get it to break loose. Which is the correct one for a 85.5 944na. Item 36 of the attached site listing
http://www.guidos-welt.net/motor.htm