SECTION 2.30 LUBRICATION SYSTEM DESCRIPTION LUBRICATION SYSTEM DESCRIPTION

Transcription

1 SECTION 2.30 LUBRICATION SYSTEM DESCRIPTION LUBRICATION SYSTEM DESCRIPTION The engine lubrication system consists of the following component parts: Oil sump and suction line Oil pump Oil filters and housing Oil cooler Piston cooling valve External and internal oil piping Optional oil level regulator Optional oil preheat/prelube OIL FLOW DESCRIPTION F18/H24 Oil is drawn from the crankcase sump through the oil pump (see Figure ). The high pressure oil from the pump flows past a pump mounted relief valve. The cold start relief valve bleeds excessive oil pressure to the sump. The valve starts to open at 552 kpa (80 psi) and is full open at 797 kpa (142 psi). The oil is pumped to the oil pressure regulating valve and oil cooler. The main oil pressure regulating valve is set to maintain normal operating pressure of kpa (67 83 psi), depending on engine speed and temperature. Normal engine idle speed pressure is 241 kpa (35 psi) minimum. The oil flows through three full-flow oil filter cartridges. Each cartridge is equipped with a bypass valve which opens if filter restriction exceeds 207 kpa (30 psi). Filtered oil is then directed to the main internal oil gallery. This gallery feeds oil to the main bearings, camshaft journals, valve train and turbocharger. The oil filter housing contains the piston cooling valve. The valve blocks the flow of oil to the piston cooling jets during startup to ensure an adequate flow of oil to the engine bearings. At approximately 207 kpa (30 psi) this valve will open and supply oil to the piston cooling jets which spray oil to cool the underside of the piston crown. L36/P48 The lubricating oil is drawn from the crankcase sump to the oil pump (see Figure ). The high pressure oil from the pump flows past a pump mounted relief valve. The cold start relief valve bleeds excessive oil pressure to the sump. The valve starts to open at 629 kpa (90 psi) and is full open at 838 kpa (120 psi). The oil is pumped to the oil pressure regulating valve, oil thermostat and oil cooler. The main oil pressure regulating valve is set to maintain kpa (47 63 psi) oil gallery pressure. Depending on oil temperature, the oil flow either bypasses the oil cooler or is directed through it. To adjust for pressure drop through the oil cooler, oil thermostat and oil filters, a gallery sensing line is used to adjust the main oil pressure regulating valve to maintain the proper oil pressure. The oil flows through two full flow oil filters. The filter housing is equipped with a bypass valve which opens if filter restriction exceeds 210 kpa (30 psi). Filtered oil is then directed to the rear of the engine and enters the main internal oil gallery above the main bearings. This gallery feeds oil to the main bearings, camshaft journals, valve train and turbochargers. The front of this gallery contains the piston cooling valve. The valve blocks the flow of oil to the piston cooling jets during startup to ensure an adequate flow of oil to the engine bearings. At approximately 244 kpa (35 psi) this valve will open and supply oil to the piston cooling jets which spray oil to cool the underside of the piston crown. FORM 6284 Third Edition

2 ROCKER ARMS AUXILIARY ROCKER ARM ASSEMBLY CAMSHAFT TO TURBOCHARGER PRESSURE REGULATOR MAIN OIL GALLERY OIL FILTER BASE JET CONTROL CRANKSHAFT JET UNFILTERED OIL FILTERED OIL SUCTION TUBE SUCTION SCREEN OIL PUMP PRESSURE TUBE Figure F18/H24 Engine Oil Schematic FORM 6284 Third Edition

3 LUBRICATION SYSTEM DESCRIPTION UNFILTERED OIL TO GOVERNOR DRIVE FILTERED OIL GEAR SPRAY LUBE MAIN OIL GALLERY TO AUXILIARY WATER PUMP TO SUMP ROCKER ARMS CAM FOLLOWER TO CRANKSHAFT TO MAGNETO DRIVE PISTON COOLING JET CONTROL TO JACKET WATER PUMP FRONT GEAR HOUSING OIL PRESSURE REGULATOR AND THERMOSTAT HOUSING BYPASS TO SUMP OIL PUMP OIL FILTER HOUSING BYPASS TO SUMP Figure L36/P48 Engine Oil Schematic FORM 6284 Third Edition

4 OIL PUMP AND SUCTION LINE The bottom of the engine housing is enclosed by a fabricated steel oil sump. A screened suction pipe draws the oil from the lowest point in the sump. The oil drain plug is located at the front of the oil sump. OIL PUMP The oil pump is a gear-type pump that is driven off the front end of the crankshaft by an idler gear. The oil pump is internally mounted in the front of the oil sump. There is a pressure relief valve for cold oil starting. OIL FILTERS AND HOUSING The F18/H24 oil filter housing is mounted on the crankcase, above the oil cooler. The filtering system consists of three replaceable filter cartridges (see Figure ). The oil filters are full-flow type. This means that all lubricating oil is normally filtered. The filter cartridge contains a bypass valve that prevents the loss of oil circulation due to a dirty oil filter. OIL FILTER HOUSING Figure L36/P48 Oil Filter Housing Oil filters are the full flow type. This means that all the lubricating oil is normally filtered. The filtering system consists of two replaceable filter cartridges. The filter housing contains a bypass valve that prevents the loss of oil circulation due to a dirty oil filter. The F18/H24 oil cooler is a plate type arrangement. The oil flows through the plates while the cooling water passes around the plates (see Figure ). The jacket water pump supplies the cooling water on the G engines. GSID, GL and GLD engines have a separate auxiliary water pump cooling circuit. OIL FILTERS Figure F18/H24 Oil Filters The L36/P48 oil filter housing is contained in the base type oil pan of the engine (see Figure ). Figure F18/H24 Oil Cooler Housing FORM 6284 Third Edition

5 The F18/H24GLD/2 oil cooler is a tube and bundle arrangement. The oil flows around the tubes while the auxiliary water passes through the tubes (see Figure ). The end bonnet contains the auxiliary water thermostat (see Figure ). THERMOSTAT Figure F18/H24 Oil Cooler Housing The L36/P48 oil cooler is a tube and bundle arrangement. The oil flows around the tubes while the auxiliary water passes through the tubes (see Figure ). Figure F18/H24 Oil Pressure Regulating Valve PRESSURE REGULATING AND OIL THERMOSTAT The pressure regulating valve maintains the engine oil pressure within the proper operating range. This pressure range is preset at the factory. The F18/H24 valve is located in oil filter base (see Figure ). Figure L36/P48 Oil Cooler REGULATING Figure Oil Regulating Valve FORM 6284 Third Edition

6 The L36/P48 pressure regulating valve maintains the engine oil pressure within a range of 380 ± 5.5 kpa (55 ± 8 psi). This is preset at the factory. This same housing contains the oil thermostat and is located on the right front side of the engine base (see Figure ). The L36/P48 piston cooling valve is located under the front cover (see Figure ). The valve blocks the flow of oil to the piston cooling jets during startup to ensure an adequate flow of oil to the engine bearings. THERMOSTAT REGULATING Figure L36/P48 Oil Thermostat And Regulating Valve CONTROL The F18/H24 piston cooling control valve is located in the oil filter housing (see Figure ). The valve blocks the flow of oil to the piston cooling jets during startup to ensure an adequate flow of oil to the engine bearings. Figure L36/P48 Piston Cooling Control Valve At approximately 244 kpa (35 psi) this valve will open and supply oil to the piston cooling jets which spray oil to cool the underside of the piston crown. To ensure piston cooling during full load CAUTION operation, the low oil pressure shutdown is to be set at 173 kpa (25 psi). Disregarding this information could result in product damage and/or personal injury. CONTROL Figure F18/H24 Piston Cooling Control Valve FORM 6284 Third Edition

7 MAGNETIC PLUG Remove and inspect the magnetic plug in the turbocharger lubrication circuit at every oil change (see Figure and Figure ). OIL LEVEL INDICATOR Figure Oil Level Regulator MAGNETIC PLUG Figure F18/H24 Turbocharger Oil Supply Magnetic Plug MAGNETIC PLUG Figure L36/P48 Turbocharger Oil Supply OIL LEVEL REGULATOR OPTIONAL The regulator, if equipped, is mounted on the left lower side of the engine (see Figure ). The regulator will maintain the engine crankcase oil to the correct level. Make-up oil at atmospheric pressure from a raised tank is supplied to the regulator inlet. If the oil level should drop for any reason, the float will also drop, opening the float valve and allowing makeup oil to be added to the crankcase. A contact is available for customer connection of a low oil warning or shutdown system. NOTE: The regulator should be adjusted so that when the engine oil is at the proper level, the regulator sight glass is full to the midpoint. To prevent the regulator from malfunction- CAUTION ing, the inlet screen to the regulator should be cleaned regularly. OIL PRESSURE Under normal load operating conditions, the lubrication system will maintain the oil pressure within the specified range. A cold engine, or the addition of cold oil to the crankcase of a warm engine, will cause higher oil pressure until the oil temperature stabilizes in the proper range. The oil pressure gauge CAUTION of an engine started under cold conditions may fail to register pressure immediately. If pressure fails to register after the engine has run for 10 seconds, the engine should be shut down and the cause of the lack of pressure determined and corrected. Disregarding this information could result in product damage. FORM 6284 Third Edition