I just pulled the oil filter adapter off this afternoon looking for a gasket problem. My question has been answered. What you see down the bore is NOT a seat for the relief valve plunger, it's a stop. And the diagrams in both the Dodge FSM and the Cummins repair manuals about how the valve functions are grossly inaccurate.
Did you check with Cummins to see what they say the oil pressure should be ? I have a 98 but it's a 24V and my oil pressure on the dash gauge is 60 cold and when running down the highway , I haven't put a mechanical to compare it . I found it odd , they must have changed something because the gauge in my 2000 don't think reads as high as the 98 but the needle goes to a similar spot ??? It's been a long time since I've run the 2000.
