CYLINDER AS 5217797 - Caterpillar

Intake And Compression Of Air (Loaded)
Air is drawn from the engine air cleaner through air inlet port (3). The rotation of crankshaft (20) controls the reciprocating action of piston assembly (14) through connecting rod assembly (25). On the downward stroke of the piston, inlet reed valve (4) is drawn away from its seat on the underside of reed valve plate assembly (13). At the same time, this same downward movement of the piston, holds delivery valve (1) against its seat on the upper surface of the reed valve plate assembly (13). As the piston assembly descends air is drawn through the holes in reed valve plate assembly (13) (via the inlet chamber) into the cylinder bore above piston assembly (14).At the bottom of the piston stroke, both the inlet reed and delivery valves are closed. As the piston assembly (14) starts to rise the inlet reed valve (4) remains closed. But the increase in pressure opens delivery valve (1) to expose the holes through which the air passes into the delivery chamber and then to the vehicle brake system via delivery port (9).After the piston reaches the top of its stroke and starts to descend, delivery valve (1) closes and inlet reed valve (4) opens to allow the cycle to start again.Non-Compression Of Air (Unloaded)
When vehicle system pressure is reached, the brake systems governor valve will send a signal pressure to governor signal port (8). This will lift the unloader valve assembly (5) to reveal the holes in the reed valve plate assembly (13) that it normally seals. The effective seal of the inlet chamber is now lost, and the air compressor is now "off-load". This state will remain until system pressure drops sufficiently to allow the governor to respond and the pressure at governor signal port (8) exhausts. The force of the spring above the unloader piston now closes the unloader valve assembly (5), sealing off the holes in the reed valve plate assembly (13). The air compressor is now in the "on-load" condition.Lubrication
Oil under pressure from the engine lubricating system enter the air compressor through oil inlet port (21). The oil then flows through cross drilled passages in the crankshaft to the crankshaft bearings (22) and the crankshaft end of the connecting rod. The other internal surfaces are lubricated by oil splash and mist. The oil returns to the engine through a drain in the air compressor mounting flange.Cooling
Air flowing through the engine compartment from the action of the engine's fan and the movement of the vehicle assists in cooling the crankcase. Coolant flowing from the engine's cooling system through connecting lines enters the head and passes through the head's water jacket and back to the engine. Proper cooling is important in maintaining discharge air temperatures below the maximum 220°C (428°F) recommended.Air Induction
There is only one method of providing clean air to the 1W150R Air Compressor which is via the engine air cleaner of the vacuum side (engine air cleaner) of the turbocharger.Preventive Maintenance
Air Induction
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