OIL FLOW CONTROL AND FILTRATION 20 Figure 20 — Lubrication System Flow Diagram There are three filters, one by-pass and two full-flow, attached to a housing mounted at the lower right side of the engine. Oil flow through the filters and the lubrication system is controlled by six valves, including: The reducing valve maintains constant system oil pressure. The safety valve prevents excessive pressure during periods of high viscosity. The oil cooler thermostat valve prevents oil from entering the cooler until it warms to the set point. The overflow valve allows oil to by-pass the filter if it becomes clogged.
The opening valve prevents oil from moving to the piston cooling outlets until the system reaches the set pressure. The control valve regulates the oil flow to the piston cooling channels. Reducing Valve Safety Valve Oil Cooler Thermostat Valve Overflow Valve, Full-Flow Filter Opening Valve, Piston Cooling Control Valve, Piston Cooling Page 26 DESCRIPTION AND OPERATION 1. Strainer 2. Pickup Tube 3. Oil Pump 4. Pressure Pipe 5. Oil Cooler 6. Filter Housing 7. Full-Flow Filters 8. Main Lubrication Gallery 9. CCV Separator 10. Exhaust Brake Oil Control Valve 11. Air Compressor 12. Turbocharger 13. By-Pass Filter 14. Piston Cooling Nozzles 15. EGR Valve A. Reducing Valve B. Safety Valve C.
Oil Cooler Thermostat Valve D. Overflow Valve, Full-Flow Filter E. Opening Valve, Piston Cooling F. Control Valve, Piston Cooling