VALVE AS-DRAIN 4324252 - Caterpillar

Illustration 1 g01113661
Lubrication system schematic
(1) Oil flow to Variable valve actuators
(2) Warm up valve
(3) Piston cooling jets
(4) Main oil gallery in cylinder block
(5) Engine oil pressure sensor
(6) Oil flow to valve mechanism and Cat compression brake (if equipped)
(7) Camshaft journals
(8) Oil filter bypass valve
(9) Main bearings
(10) Signal line
(11) Primary engine oil filter
(12) Engine oil pump
(13) Secondary oil filter
(14) Oil cooler bypass valve
(15) Engine oil cooler
(16) Oil pan sump
(17) High pressure relief valve
(18) Oil pump bypass valve
Illustration 2 g01113698
Typical example
Right side of engine
(11) Primary engine oil filter
(12) Engine oil pump
(13) Secondary oil filter (not shown)
(15) Engine oil cooler The lubrication system supplies 110 °C (230 °F) filtered oil at approximately 275 kPa (40 psi) at rated engine operating conditions. Oil pump bypass valve (18) is controlled by the engine oil manifold pressure, rather than the oil pump pressure. The engine oil manifold pressure is independent of the pressure drop that is caused by the engine oil filter and the engine oil cooler.Oil cooler bypass valve (14) maintains the engine oil temperature to 110 °C (230 °F). High pressure relief valve (17), which is located in the filter base, protects the filters and other components during cold starts. The opening pressure of the high pressure relief valve is 680 kPa (98 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 opening pressure of the oil filter bypass valve is a pressure differential of 170 kPa (25 psi). Engine oil pressure sensor (5) is part of the engine protection system.The turbocharger cartridge bearings are lubricated by the oil supply line from the main oil gallery, and the oil drain line returns the oil flow to the sump.Oil Flow Through The Lubrication System
Illustration 3 g01114104
Oil filter base
(1) Oil from engine oil cooler
(2) Passage to engine oil filter
(3) Filtered oil
(4) Cooler bypass valve
(5) Bypass valve for the engine oil pump
(6) Engine oil filter bypass valve
(7) High pressure relief valve
(8) Oil from engine oil pump
(9) Passages to secondary oil filter
(10) S O S ports The engine oil pump is mounted to the back of the front gear train on the lower right hand side of the engine. The engine oil pump is driven by an idler gear from the crankshaft gear. Oil is pulled from the sump through oil pump bypass valve (5) on the way to the engine oil cooler. The bypass valve controls the oil pressure from the engine oil pump. The engine oil pump can supply 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.High pressure relief valve (7) regulates high pressure in the system. The high pressure relief valve will allow the oil to return to the sump when the oil pressure reaches 680 kPa (98 psi). The fully open pressure for the high pressure relief valve is 695 kPa (100