OIL FLOW THROUGH THE OIL FILTER AND OIL COOLER

LUBRICATION SYSTEM - TM-5-3805-263-14P-2_25

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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LUBRICATION SYSTEM TM 5-3805-263-34&P-2 OIL FLOW THROUGH THE OIL FILTER AND OIL COOLER With the engine warm (normal operation), oil comes from the oil pan (6) through the suction bell (9) to the oil pump (7). The oil pump sends warm oil to the oil cooler (10) and then to the oil filter (4). From the oil filter. oil is sent to the oil manifold (1) in the cylinder block and to the oil supply line (2) for the turbocharger. Oil from the turbocharger goes back through the oil return line (3) to the oil pan, With the engine cold (starting conditions), oil comes from the oil pan (6) through the suction bell (9) to the oil pump (7). When the oil is cold, an oil pressure difference in the bypass valve (installed in the oil filter housing) causes the valves to open. These bypass valves give immediate lubrication to all com- ponents when cold oil with high viscosity causes a restriction to the oil flow through the oil cooler (10) and oil filter (4). The oil pump then sends the cold oil through the bypass valve for the oil cooler (8) and through the bypass valve for the oil filter (5) to the oil manifold (1) in the cylinder block and to the supply line (2) for the turbocharger. Oil from the turbo- charger goes back through the oil return line (3) to the oil pan. When the oil gets warm, the pressure difference in the bypass valves decreases and the bypass valves close. Now there is a normal oil flow through the oil cooler and oil filter. The bypass valves will also open when there is a restriction in the oil cooler or oil filter. This action does not let an oil cooler or oil filter with a restriction prevent the lubrication of the engine. 1-16 SYSTEMS OPERATION OIL FLOW IN THE ENGINE There is a bypass valve in the oil pump. This bypass valve controls the pressure of the oil coming from the oil pump. The oil pump can put more oil into the-system than is needed. When there is more oil than needed, the oil pressure goes up and the bypass valve opens. This lets the oil that is not needed go back to the oil pan. The output of the oil pump goes to the oil manifold in the cylinder block. The oil manifold is the source of oil under pressure for the engine and its attachments. From the oil manifold in the cylinder block, oil is sent through drilled passages in the cylinder block that connect the main bearing!, and the camshaft bearings. Oil goes through drilled holes in the crankshaft to give lubrication to the connecting rod bearings. Oil goes out through piston cooling orifices in the block. These orifices are between cylinders 1 and 2 and between cylinders 3 and 4, near the main bear- ings. The oil cools the pistons and helps lubricate the pistons, piston pins, cylinder walls and piston rings. Oil is sent through passages to the rocker arm shaft. Holes in the rocker arm shafts let the oil give lubrication to the valve system components in the cylinder head. The oil supply passage for the rocker arms has an oil passage from the rear of the cylinder block that goes below the head bolt hole and connects with a drilled passage in the cylinder block to the oil pas- sage in the head. The spacer plate has a hole with a

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