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nw MN | Happened to one of mine this fall, lost about half of oil pressure. I pulled the relieve valve on bottom of pump. It looked good, dressed a few small nicks off the plunger and slid back into housing making sure it could travel up and down easily. Reassembled and all was good again. No major issue visually but this regulator must be very sensitive to small pieces of debris. Doing research I also saw it was possible for pump gears to slip on the shaft. They are only pressed on. Also piston coolers can cause this but you already looked into that.
Edited by OlsonKrist 1/5/2016 12:15
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855 cummins oil pressure problems
