SEAL-WATER 7N8025 - Caterpillar

Lubrication System Components
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(1) Engine oil filler (2) Engine oil level gauge (3) Engine oil cooler (4) Bonnet (6) Bypass valve for the engine oil filter and for the engine oil cooler (7) Engine oil filter (8) Engine oil pan (9) Drain plugOil Flow through the Oil Filter and Oil Cooler
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Lubrication system schematic (1) Flow of engine oil to the main engine oil gallery (2) Bypass valve for the engine oil filter (3) Engine oil cooler (4) Bypass valve for the engine oil cooler (5) Engine oil filters (6) Engine oil pan (7) Engine oil pumpEngine oil pump (7) is driven by the front gear train. The engine oil pump pulls engine oil from engine oil pan (6) through a suction bell. The suction bell has a screen in order to strain large debris from the engine oil.The engine oil pump has a relief valve that controls the pressure of the engine oil from the engine oil pump. If the engine oil pressure from the pump becomes excessive, the relief valve opens and some of the engine oil returns to the engine oil pan. This prevents high pressure engine oil from damaging the O-ring seals for the engine oil cooler and the engine oil filter.Engine oil filters (5) and engine oil cooler (3) have bypass valves (2) and (4). When the engine is cold, the pressure forces the bypass valves open. This provides immediate lubrication to the engine when cold engine oil with high viscosity causes a restriction.After the engine warms up, the differential pressure on the bypass valves decreases and the bypass valves close. The engine oil flows normally through the engine oil cooler and through the engine oil filter.The bypass valves will also open if there is a restriction in the engine oil cooler or in the engine oil filter. This allows the engine to be lubricated if the engine oil cooler is plugged or if the engine oil filter is dirty.The engine oil is filtered and cooled. Clean engine oil is pumped to main engine oil gallery (1) .Oil Flow in the Engine
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Schematic of the flow of engine oil through the engine (1) These openings are plugged. (2) Supply for the turbocharger (3) Supply for the governor drive (4) Rocker arm shaft (5) Supply for the rocker arm shaft (6) Supply for the rocker arm shaft and valve lifters (7) Camshaft bearing (8) Piston cooling jet (9) Supply for the timing gear (10) Supply for the front idler gear (11) Supply for the auxiliary water pump (12) Supply from the engine oil cooler to the main engine oil galleries (13) Main bearingsEngine oil is supplied to the main engine oil gallery in the right side of the engine. The engine oil from the right side is pumped to auxiliary water pump (11), to front idler gear (10), and to the main engine oil gallery in the left side of the engine.After auxiliary water pump (11) and front idler gear (10) are lubricated, the