COVER GP-FRONT HOUSING 2119120 - Caterpillar

Illustration 1 g00322483
Main oil pump and lubrication system schematic (typical example)
(1) Main oil gallery
(2) Left camshaft oil gallery
(3) Piston cooling jet oil gallery
(4) Piston cooling jet oil gallery
(5) Right camshaft oil gallery
(6) Oil supply lines
(7) Sequence valve
(8) Sequence valve
(9) Adapter
(10) Engine oil filter bypass valve
(11) Engine oil cooler
(12) Engine oil cooler bypass valve
(13) Oil pump relief valve
(14) Engine oil pump
(15) Elbow
(16) Suction bell
(17) Engine oil filter housingThis system uses an engine oil pump (14) with three pump gears. The pump gears are driven by the front gear train. Engine oil is pulled from the pan through suction bell (16) and elbow (15) by engine oil pump (14). Suction bell (16) has a screen to protect the engine oil pump from debris.There is an oil pump relief valve (13) in the engine oil pump. The oil pump relief valve controls the pressure of the engine oil from the engine oil pump. This allows the engine 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 the engine oil filters to main oil gallery (1) and left camshaft oil gallery (2) in the cylinder block. Engine oil cooler (11) lowers the temperature of the engine oil before the engine oil is sent to the filters.Engine oil cooler bypass valve (12) allows engine oil to flow directly to the filters if engine oil cooler (11) becomes plugged or if the engine oil becomes thick enough to increase the oil pressure differential by 180 20 kPa (26 3 psi).Engine oil filters are located in engine oil filter housing (17) at the front of the engine. A single bypass valve is located in the engine oil filter housing.Clean engine oil from the filters goes through adapter (9) into the cylinder block. Part of the engine oil goes to left camshaft oil gallery (2). The remainder of the engine oil goes to main oil gallery (1).Left camshaft oil gallery (2) and right camshaft oil gallery (5) are connected to each camshaft bearing by a drilled hole. The engine oil goes around each camshaft journal. The engine oil then travels through the cylinder head and the rocker arm base 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.The main oil gallery is connected to the main bearings by drilled holes. Drilled holes in the crankshaft connect the main bearing oil supply to the rod bearings. Engine oil from the rear of the main oil gallery goes to the rear of the right camshaft oil gallery.Sequence valve (7) and sequence valve (8) allow engine oil from the main oil gallery to go to both piston cooling jet galleries (3) and (4). The sequence valves begin to open at approximately 130 kPa (19 psi). The sequence valves will not allow engine