BEARING-SLEEVE 4W3996 - Caterpillar

Illustration 1 g01432304
Lubrication system schematic (1) Turbocharger (2) Valve mechanism (3) Oil supply line (4) Camshaft (5) Fuel injection pump (6) Oil cooler (7) Main oil gallery (8) Piston cooling jet (9) Oil pressure relief valve (10) Timing gear (11) Oil filter (12) Crankshaft (13) Oil bypass valve (14) Suction bell (15) Oil pumpUnder normal operation, the oil travels from the oil pan through the suction bell (14) to oil pump (15) . Oil pump (15) sends warm oil through oil filter (11) to oil cooler (6) . Oil cooler (6) is mounted in the path of the coolant on the right side of the engine block. Engine oil is cooled or engine oil is warmed by the element of the oil cooler with the water in the cylinder block. When the pressure of the oil system reaches 343 kPa (50 psi) oil pressure relief valve (9) opens. Excess oil flows to the oil pan when oil pressure relief valve (9) opens. The oil pressure relief valve provides the main relief for the lubrication system. The oil pressure relief valve is adjustable by the use of shims. If oil pressure relief valve (9) does not open, increased oil pressures could result in component damage. Oil bypass valve (13) is used as a backup to relieve system pressures. The valve is located on the bottom of the engine block inside the oil pan. Oil bypass valve (13) will open if the lubrication system oil pressure reaches 981 98 kPa (142 14 psi).Part of the oil is directed to fuel injection pump (5) and part of the oil is directed to timing gears (10) from main oil gallery (7) . Oil is also supplied through oil supply line (3) for turbocharger (1) . Engine oil flows through the inlet tube in the cartridge housing in order to lubricate the turbocharger bearings. Oil travels from the drain of the turbocharger through an oil return line to the oil pan. Oil is sent from main oil gallery (7) through drilled passages in the cylinder block. The passages in the cylinder block connect main bearings and camshaft bearings. Oil travels through drilled holes in crankshaft (12) in order to give lubrication to the connecting rod bearings. A small amount of oil is sent through piston cooling jet (8) in order to cool the pistons. Oil travels through the grooves in the camshaft bearing bore. The oil then travels into oil passages that connect to valve mechanism (2) . Oil then flows from valve mechanism (2) to the bores of the tappet.The oil travels back to the engine oil pan after the oil completes the process of lubrication.