Posted 1/4/2016 19:38 (#5011026 - in reply to #5010394) Subject: RE: 855 cummins oil pressure problems
Like ndred said, it could be one of the little plastic piston coolers(not sure if I named that correctly). It happened on my 86. Was real easy to check and change them. One broken caused a reduction of about 8psi if memory serves. Was easy to notice on gauge, and warm idle was scary low.
Apologies. I missed that you went through them already. Good luck.
855 cummins oil pressure problems
