LUBRICATION SYSTEMTM 5-3805-263-34&P-2OIL FLOW THROUGH THE OIL FILTERAND OIL COOLERWith the engine warm (normal operation), oilcomes from the oil pan (6) through the suction bell(9) to the oil pump (7). The oil pump sends warm oilto the oil cooler (10) and then to the oil filter (4).From the oil filter. oil is sent to the oil manifold (1) inthe cylinder block and to the oil supply line (2) for theturbocharger. Oil from the turbocharger goes backthrough the oil return line (3) to the oil pan,With the engine cold (starting conditions), oilcomes from the oil pan (6) through the suction bell(9) to the oil pump (7). When the oil is cold, an oilpressure difference in the bypass valve (installed inthe oil filter housing) causes the valves to open. Thesebypass valves give immediate lubrication to all com-ponents when cold oil with high viscosity causes arestriction to the oil flow through the oil cooler (10)and oil filter (4). The oil pump then sends the cold oilthrough the bypass valve for the oil cooler (8) andthrough the bypass valve for the oil filter (5) to the oilmanifold (1) in the cylinder block and to the supplyline (2) for the turbocharger. Oil from the turbo-charger goes back through the oil return line (3) tothe oil pan.When the oil gets warm, the pressure difference inthe bypass valves decreases and the bypass valvesclose. Now there is a normal oil flow through the oilcooler and oil filter.The bypass valves will also open when there is arestriction in the oil cooler or oil filter. This actiondoes not let an oil cooler or oil filter with a restrictionprevent the lubrication of the engine.1-16SYSTEMS OPERATIONOIL FLOW IN THE ENGINEThere is a bypass valve in the oil pump. Thisbypass valve controls the pressure of the oil comingfrom the oil pump. The oil pump can put more oil intothe-system than is needed. When there is more oilthan needed, the oil pressure goes up and the bypassvalve opens. This lets the oil that is not needed goback to the oil pan.The output of the oil pump goes to the oil manifoldin the cylinder block. The oil manifold is the source ofoil under pressure for the engine and its attachments.From the oil manifold in the cylinder block, oilis sent through drilled passages in the cylinder blockthat connect the main bearing!, and the camshaftbearings. Oil goes through drilled holes in thecrankshaft to give lubrication to the connectingrod bearings.Oil goes out through piston cooling orifices in theblock. These orifices are between cylinders 1 and 2and between cylinders 3 and 4, near the main bear-ings. The oil cools the pistons and helps lubricatethe pistons, piston pins, cylinder walls and pistonrings.Oil is sent through passages to the rocker armshaft. Holes in the rocker arm shafts let the oil givelubrication to the valve system components in thecylinder head.The oil supply passage for the rocker arms has anoil passage from the rear of the cylinder block thatgoes below the head bolt hole and connects with adrilled 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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