DETROIT DIESEL Engine Systems .I---.. .- OLEW CORE , 12305 Fig. 16 - Schematic Diagram of Typical 12V Lubricating Systems the vertical oil galleries. When the oil pressure at the regulator valve(s) exceeds 50 psi (345 kPa), the valve(s) open and discharge the excess oil to the sump. Oil Filters Engines are equipped with a full-flow type lubricating oil filter. Hf additional filtering is required, a by-pass Page 2%