BOLT 8T6468 - Caterpillar

Illustration 1 g02018874
Schematic of the engine lubrication system
(1) Engine oil filler
(2) Engine block
(3) Turbocharger (if equipped)
(4) Bypass valve for the engine oil filter
(5) Engine oil cooler bypass valve
(6) Pressure relief valve for the engine oil pump
(7) Engine oil pan
(8) Engine oil cooler
(9) Engine oil pump
(10) Suction screen Engine oil pump (9) is a gear-type pump that generates pressure for the engine lubrication system. The engine oil pump is bolted to the bottom of engine block (2) inside the engine crankcase toward the front of the engine. The pump gears are driven by the front gear train. Oil is drawn into the inlet of the pump through suction screen (10) into a suction tube that is connected to the oil pump.Pressure relief valve (6) is internal to the engine oil pump. The pressure relief valve controls the engine oil pressure to a maximum of 703 14 kPa (102 2 psi). Excess engine oil that is bypassed by the oil pump is returned to engine oil pan (7). The pressurized oil is directed through engine oil cooler (8). The engine oil cooler lowers the temperature of the engine oil before the engine oil is filtered. If the oil cooler becomes restricted, engine oil cooler bypass valve (5) allows engine oil to bypass the oil cooler. When the pressure differential across the oil cooler exceeds 172 21 kPa (25 3 psi), engine oil will bypass the oil cooler. The oil cooler is mounted to the left side of the engine. The pressure relief valve is located in the oil filter base.Engine oil filter (1) is used to clean the engine oil. If the oil filter becomes restricted, engine oil filter bypass valve (4) allows engine oil to bypass the oil filter. When the pressure differential across the oil filter exceeds 172 21 kPa (25 3 psi), engine oil will bypass the oil filter. A spin-on oil filter is used for this engine. The filter is located on the left side of the engine. The pressure relief valve is located in the oil filter base.
Illustration 2 g02019118
Lubrication system schematic
(11) Oil supply passage through the center of the rocker arm shaft
(12) Test port at the rear of the cylinder block
(13) Oil supply passage for the turbocharger (if equipped)
(14) Piston cooling jets
(15) Camshaft bearing journal
(16) Main oil gallery
(17) Crankshaft main bearing journal
(18) Port for the inlet to the main oil gallery Clean engine oil from the filter flows into the main oil gallery (16) through port (18). The main oil gallery supplies oil to each camshaft bearing journal (15) and each crankshaft main bearing journal (17). The oil flows to the journals through drilled passages in the engine block. Drilled holes that are in the crankshaft connect the oil supply for the main bearings to the rod bearings.
Illustration 3 g02020502There are also passages (14) that are used as piston cooling jets. These passages are drilled into the engine block directly above the main bearing journals. The passages are located above journals