Has anyone any information on the oil pressure relief valve on a 1992 4.0 litre. I took the oil pump apart and there wasn't any plunger or spring from what i could see, just a threaded bushing where i thought the relief valve is, behind the oil pump pick up tube mounting flange.

Thanks, Hoppy

 

 

Did you ever find any info on this? I have same year vehicle with low oil pressure issues too
I did find this info, not sure about it
https://www.explorerforum.com/forums...eep-jpg.87631/