0332947 JOHNSON SHELL

Illustration 1 g06471531Reference: For more information, refer to supplemental video "3512E Petroleum Engines Lubrication System" on Caterpillar Channel 1.Note: Click or copy the following link into a web browser (A CWS login is required to access Caterpillar Channel 1), or scan the following QR code using a QR enabled device.
Illustration 2 g06482864System Operation
Illustration 3 g06477522
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) Adapter (rear/right oil distribution block)
(9) Engine oil filter housing
(10) Engine oil cooler
(11) Engine oil pump
(12) ElbowThis system uses an engine oil pump (11) with three pump gears. The pump gears are driven by the front gear train. Engine oil is pulled from the pan through suction bell and elbow (12) by engine oil pump (11). The suction bell has a screen to prevent debris larger than 1 mm (0.039 inch) from entering the lube system and damage the oil pump or other lubrication system components prior to the engine oil filters.There is an oil pump relief valve 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 (10) and the engine oil filters to main oil gallery (1) and left camshaft oil gallery (2) in the cylinder block. Engine oil cooler (10) lowers the temperature of the engine oil before the engine oil is sent to the filters.Engine oil cooler bypass valve allows engine oil to flow directly to the filters if engine oil cooler (10) 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 filter base (9) holds four spin-on oil filter elements. The base has an internal bypass valve for each filter element. The filter bypass valve will open if there is a restriction in the engine oil filter, and it will open and close briefly to protect the oil filter during engine startup at high speed in freezing ambient temperature. The filter bypass allows the engine to be lubricated if the engine oil filter is dirty (plugged). Extended run time with an open oil filter bypass will damage the engine.Clean engine oil from the filters goes through adapter (8) 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 and sequence valve 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 oil into the piston cooling jet galleries until there is pressure in the main oil gallery. This decreases the amount of time that is necessary for pressure buildup when the engine is started. This also helps hold pressure at idle speed.
Illustration 4 g06484363
(13) Piston cooling jet
Illustration 5 g06165422There is a piston cooling jet (13) below each piston. Each cooling jet has two openings. One opening is in the direction of a passage in the bottom of the piston. This passage takes engine oil to a manifold behind the ring band of the piston. A slot (groove) is in the side of both piston pin bores. This slot connects with the manifold behind the ring band. The other opening is in the direction of the center of the piston. This helps cool the piston and this supplies lubrication to the piston pin.
Illustration 6 g06484456
(6) Oil supply linesOil supply lines (6) provide engine oil for lubrication of the turbocharger bearings. The engine oil flows through the turbocharger support into the rear housing.Engine oil is sent to the front and rear gear groups through drilled passages. The drilled passages are in the front housing, the rear housing, and the faces of the cylinder block. These passages are connected to left camshaft oil gallery (2) and right camshaft oil gallery (5).After the engine oil flows through the lubrication system, the engine oil returns back to the engine oil pan.