STUD 9K7807 - Caterpillar

Lubrication System Components
Illustration 1 g00562119
Lubrication system components (typical example) (1) Oil supply line (2) Oil return line (3) Oil cooler (4) Oil filter (5) Oil panThe lubrication system has the following components:
oil pan
oil pump
oil cooler
oil filter
turbocharger oil lines
oil passages for the cylinder blockOil Flow Through The Oil Filter And Oil Cooler
Illustration 2 g00562123
Oil flow when the engine is warm. (1) Oil manifold (2) Oil supply line (3) Oil return line (4) Oil filter (5) Bypass valve for the oil filter (6) Oil pan (7) Oil pump (8) Bypass valve for the oil cooler (9) Suction lines (10) Oil cooler (11) Bypass valve for the oil pumpWhen the engine is warm, oil comes from the oil pan (6) through the suction lines (9) to the oil pump (7). The oil pump sends hot oil to the oil cooler (10). The oil is then sent to the oil filter (4). Oil from the oil filter 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.
Illustration 3 g00562383
Oil flow when the engine Is cold. (1) Oil manifold (2) Oil supply line (3) Oil return line (4) Oil filter (5) Bypass valve for the oil filter (6) Oil pan (7) Oil pump (8) Bypass valve for the oil cooler (9) Suction lines (10) Oil cooler (11) Bypass valve for the oil pumpWhen the engine is cold, oil comes from the oil pan (6) through the suction lines (9) to the oil pump (7). When the oil is cold, an oil pressure difference in the bypass valves also causes the bypass valves to open. These bypass valves then provide immediate lubrication to all of the engine components when cold oil with high viscosity causes a restriction to the oil flow through the oil cooler (10) and the oil filter (4). The oil pump then sends the cold oil through the bypass valve (8) for the oil cooler and through the bypass valve (5) for the oil filter. The oil then goes to the oil manifold (1) in the cylinder block and to the supply line (2) for the turbocharger. Oil from the turbocharger goes back through the oil return line (3) to the oil pan.When the oil is warm, an oil pressure difference in the bypass valves also causes the bypass valves to close. There is normal oil flow through the oil cooler and the oil filter.The bypass valves will also open when there is a restriction in the oil cooler or the oil filter. This prevents a restricted oil filter or a restricted oil cooler from stopping the lubrication of the engine. The system pressure is limited by the oil pump bypass valve (11) .Oil Flow In The Engine
Illustration 4 g00431790
Engine oil flow schematic (1) Rocker arm shaft (2) Oil passage to air compressor (3) Camshaft bearing journals (4) Oil passage to adjustable idler gear (5) Oil passage to