ELECTRONICS GP-ENGINE RATINGS 4176089 - Caterpillar

Lubrication System Components
Illustration 1 g00562119
Lubrication system components (1) Oil supply line (2) Oil return line (3) Oil cooler (4) Oil filter (5) Oil panThe lubrication system consists of the following components:
Oil pan
Oil pump
Oil cooler
Oil filter
Turbocharger oil lines
Oil passages in 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) Oil pickup tube (10) Oil cooler (11) Bypass valve for the oil pumpWhen the engine is warm, oil is drawn from oil pan (6) through oil pickup tube (9) to oil pump (7). The oil pump pushes the hot oil through 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 returns 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) Oil pickup tube (10) Oil cooler (11) Bypass valve for the oil pumpWhen the engine is cold, oil is drawn from oil pan (6) through oil pickup tube (9) to oil pump (7). When the oil is cold, an oil pressure differential in the bypass valves 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 oil flow through oil cooler (10) and oil filter (4). The oil pump then pushes the cold oil through bypass valve (8) for the oil cooler and through the bypass valve (5) for the oil filter. The pressurized oil then flows to oil manifold (1) in the cylinder block and to supply line (2) for the turbocharger. Oil from the turbocharger returns through oil return line (3) to the oil pan.As the oil warms, the oil pressure differential in the bypass valves allows the bypass valves to close. Normal oil flow through the oil cooler and the oil filter is then established.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. Pressure in the lubrication system is limited by the oil pump bypass valve (11) .Oil Flow In The Engine
Illustration 4 g00613557
Engine oil flow schematic (1) Rocker arm shaft (2) Oil passage to adjustable idler gear (3) Camshaft bearing journals (4) Oil passage to air compressor (if equipped) (5) Oil passage to the fixed idler stub shaft (6) Piston