Have Detroit just did inframe oil pressure lowe change relief valve pressure down to 7psi hot at idle pressure go up at high rpm have manual gauge in block to compair to dash engine has jakes on it
changed releaf valve & oil pump change oil filters
Hello and welcome to just answer.i can help you with this..
Improper Lubricating Oil Viscosiy, Lubricating Oil Diluted With Fuel Oil or Engine Coolant 2.4 Faulty Oil Pressure Gauge Sensor 2.5 Oil Pressure Gauge Line Obstructed 2.6 Rocker Arm Shaft Plugs Missing (New or Rebuilt Engines Only) 2.7 Restricted Oil Cooler 2.8 Nonfunctional or Sticking Oil Pressure Regulator Valve 2.9 Defective Bypass Valve 2.10 Defective Pressure Relief Valve 2.11 Defective Pickup Screen Tube and Screen Assembly 2.12 Defective Crankshaft Main Bearing Shells 2.13 Defective Oil Pump Assembly 2.14 Detecting Internal Fuel Leaks here are your possibilities,let me know if you have anymore questions.
replaced mains &replaced bypass & relief valve replaced oil pump no fuel in oil can you ck oil cooler on truck