KIT-SEAL 2788641 - Caterpillar

Illustration 1 g01666216
(1) Piston cooling jets
(2) Camshaft journals
(3) Main bearings
(4) Oil passage
(5) Turbocharger oil supply line
(6) Oil filter bypass valve
(7) Oil filter
(8) Oil cooler bypass valve
(9) High pressure bypass valve
(10) Oil Cooler
(11) Engine oil pump
(12) Oil pump bypass valve
(13) Secondary engine oil filter (if equipped)
(14) Engine oil pan The lubrication system supplies filtered oil at approximately 275 kPa (40 psi) at rated engine operating conditions. Oil pump bypass valve (12) is controlled by the engine oil manifold pressure.Oil cooler bypass valve (8) maintains the engine oil temperature to 110 °C (230 °F). High pressure bypass valve (9), which is located in the filter base, protects the filters and other components during cold starts. The opening pressure of the high pressure bypass valve is 695 kPa (100 psi). Secondary oil filter (13) is a five micron filter which filters five percent of the oil flow before returning the oil to the sump. The pressure differential of the oil filter bypass valve is 170 kPa (25 psi). The engine oil pressure sensor is part of the engine protection system.The turbocharger cartridge bearings are lubricated by oil supply line (5) from the main oil gallery, and the oil drain line returns the oil flow to the sump. Oil Flow Through The Lubrication System
Illustration 2 g01091517
Flow through oil filter base
(6) Oil filter bypass valve
(8) Oil cooler bypass valve
(15) Flow from oil pan
(16) Flow up to oil cooler
(17) Flow from oil cooler
(18) Flow into oil filters
(19) Flow out of oil filters
(20) Flow to engine The engine oil pump is mounted to the back of the front gear train. The engine oil pump is driven by an idler gear from the crankshaft gear. Oil is pulled from the sump through the oil pump on the way to the engine oil cooler. The bypass valve controls the engine oil pressure. The engine oil pump is capable of supplying excess oil for the lubricating system. When this situation is present, the oil pressure increases and the bypass valve opens. The open bypass valve allows the excess oil to return to the sump.The oil then flows through the engine oil cooler. The engine oil cooler uses engine coolant in order to cool the oil. The oil cooler bypass valve (8) directs the oil flow through the engine oil cooler according to the temperature of the oil and the pressure of the oil.Oil cooler bypass valve (8) will close when the oil temperature exceeds the following temperatures 100 °C to 103 °C (212 °F to 217 °F). Closing of the bypass valve will direct the oil through the engine oil cooler.The oil cooler bypass valve (8) is normally closed if the pressure differential across the engine oil cooler is less than 155 17 kPa (22 3 psi). This will direct the oil through the engine oil cooler.When the oil returns from the engine oil cooler, the oil flows to the two engine oil filters. When the oil pressure differential across oil filter bypass valve (6) reaches 170 kPa