PLATE-WEAR 3606008 - Caterpillar

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Turbocharger with wastegate (12) Canister (13) Actuating lever (14) Line (boost pressure)The operation of the wastegate is controlled by the boost pressure. At high boost pressures, the wastegate opens in order to decrease boost pressure. At low boost pressure, the wastegate closes in order to increase boost pressure.When the engine is operating under conditions of low boost, a spring pushes on a diaphragm in canister (12) . This action moves actuating lever (13) in order to close the valve of the wastegate. Closing the valve of the wastegate allows the turbocharger to operate at maximum performance.As the boost pressure through line (14) increases against the diaphragm in canister (12) , the valve of the wastegate is opened. When the valve of the wastegate is opened, the rpm of the turbocharger is limited by bypassing a portion of the exhaust gases. The exhaust gases are routed through the wastegate which bypasses the turbine wheel of the turbocharger.Note: The turbocharger with a wastegate is preset at the factory and no adjustment can be made.Bearings (3) and (9) for the turbocharger use engine oil under pressure for lubrication and cooling. The oil comes in through oil inlet port (2) . The oil then goes through passages in the center section in order to lubricate the bearings. This oil also cools the bearings. Oil from the turbocharger goes out through oil outlet port (10) in the bottom of the center section. The oil then goes back to the engine oil pan.Valve System Components
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(1) Rocker arm (2) Pushrod (3) Valve bridge (4) Valve spring (5) Valve (6) LifterThe valve system components control the flow of inlet air into the cylinders during engine operation. The valve system components also control the flow of exhaust gases out of the cylinders during engine operation.The crankshaft gear drives the camshaft gear through an idler gear. The camshaft must be timed to the crankshaft in order to get the correct relation between the piston movement and the valve movement.The camshaft has two camshaft lobes for each cylinder. The lobes operate the inlet and exhaust valves. As the camshaft turns, lobes on the camshaft cause lifters (6) to move pushrods (2) up and down. Upward movement of the pushrods against rocker arms (1) results in downward movement (opening) of valves (5) .Each cylinder has two inlet valves and two exhaust valves. The valve bridge (3) actuates the valves at the same time by movement of the pushrod and rocker arm. Valve springs (4) close the valves when the lifters move down.Air Inlet Heater
The engines are equipped with an electric heater that is located behind the air inlet elbow. The electric heater has two functions:
Aid in starting
Aid in white smoke cleanup during start-upUnder the proper conditions, the ECM turns on the electric heater.The system is capable of delivering heat for thirty seconds prior to start-up and during cranking of the engine. After the engine has started, the system is capable of delivering heat constantly for seven minutes, or