CAP 3806948 - Caterpillar

Illustration 1 g00281792
Main oil pump and lubrication system schematic (typical example)
(1) Main oil gallery
(2) Camshaft oil gallery
(3) Piston cooling jet gallery
(4) Piston cooling jet gallery
(5) Camshaft oil gallery
(6) Turbocharger oil supply
(7) Sequence valve or priority valve
(8) Sequence valve or priority valve
(9) Adapter
(10) Engine oil filter base
(11) Engine oil cooler
(12) Turbocharger drain line
(13) Engine oil cooler bypass valve
(14) Relief valve
(15) Engine oil pump
(16) Elbow
(17) Suction bell This system uses an engine oil pump (15) with three pump gears. The pump gears are driven by the front gear train. Oil is pulled from the engine oil pan through suction bell (17) and elbow (16) by the engine oil pump. The suction bell has a screen in order to clean the oil.Relief valve (14) is in the engine oil pump. The relief valve (14) controls the pressure of the oil from the engine oil pump. The engine oil pump can put too much oil into the system. When there is too much oil, the engine oil pressure goes up and the relief valve opens. This allows the oil that is not needed to go back to the inlet oil passage of the engine oil pump.The engine oil pump pushes oil through engine oil cooler (11) and through the oil filters to main oil gallery (1) and to camshaft oil gallery (2) in the block. The engine oil cooler lowers the temperature of the oil before the oil is sent to the filters.Engine oil cooler bypass valve (13) allows oil to flow directly to the engine oil filters if the engine oil cooler becomes plugged or if the oil becomes thick enough to increase the oil pressure differential by 180 20 kPa (26 3 psi).
Illustration 2 g00281793
Left side of the engine (typical example)
(10) Engine oil filter base
(19) Engine oil filter bypass valves
(20) Engine oil line
(21) Oil supply
(22) Engine oil filters Engine oil filters (22) are located on the left, front side of the cylinder block. Engine oil filter base (10) also has one engine oil filter bypass valve (19) for each filter.Clean oil from the filters goes through engine oil line (20) and into the block through adapter (9). Part of the oil goes to left camshaft oil gallery (2). The remainder of the oil goes to main oil gallery (1).Camshaft oil gallery (2) and camshaft oil gallery (5) are connected to each camshaft bearing by a drilled hole. The oil goes around each camshaft journal. The oil then travels through the cylinder head and the rocker arm housing to the rocker arm shaft. A drilled hole connects the bores for the valve lifters to the oil hole for the rocker arm shaft. The valve lifters are lubricated at the top of each stroke.Main oil gallery (1) is connected to the main bearings by drilled holes. Drilled holes in the crankshaft connect the main bearing oil supply to the rod bearings. Oil from the rear of the main oil gallery goes to the rear of camshaft oil gallery (5).Sequence valve (7) and