BOLT AS 7N0654 - Caterpillar

Lubrication System Components
Illustration 1 g00942455
(1) Engine oil filter
(2) Engine oil cooler
(3) Oil supply line for the turbocharger
(4) Oil return line from the turbocharger
(5) Engine oil level gauge
(6) Engine oil pan
(7) Drain plug Oil Flow through the Oil Filter and Oil Cooler
Illustration 2 g00291431
Lubrication system schematic
(1) Flow of engine oil to the main engine oil gallery
(2) Engine oil supply for the turbocharger
(3) Return of engine oil from the turbocharger
(4) Engine oil filter
(5) Bypass valve for the engine oil filter
(6) Engine oil pan
(7) Engine oil pump
(8) Bypass valve for the engine oil cooler
(9) Suction bell
(10) Engine oil cooler Engine oil pump (7) is driven by the front gear train. The engine oil pump pulls engine oil from engine oil pan (6) through suction bell (9). 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 for the engine oil filter.Engine oil filter (4) and engine oil cooler (10) have bypass valves (5) and (8). 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).Filtered engine oil is pumped through supply line (2) for the turbocharger. Engine oil from the turbocharger returns to the engine oil pan through return line (3) at the rear of the cylinder block.Oil Flow in the Engine
Illustration 3 g00743424
(1) Bracket for rocker arm shaft
(2) Rocker arm shaft
(3) Passage to valve lifters
(4) Valve lifter bore
(5) Supply to the rocker shaft bracket
(6) Rocker arm shaft
(7) Supply to the rocker shaft bracket
(8) Passage to accessory drive
(9) Passage to rocker shaft bracket and accessory drive
(10) Passage to idler gear shaft
(11) Passage to rocker shaft bracket
(12) This opening is plugged.
(13) Camshaft bearing
(14) Piston cooling jet
(15) Main bearing
(16) Main engine oil gallery
(17) Suction bell
(18) Supply from the engine oil filter Engine oil is pumped from suction bell (17) to the engine oil filter and to the engine oil cooler. The engine oil is cooled and filtered. The engine oil flows through supply (18) to main engine oil gallery (16).Engine oil is supplied to camshaft