CYLINDER HEAD AND VALVES

AIR INLET AND EXHAUST SYSTEM - TM-5-3805-258-24-1_203

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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TM5-3805-258-24-1 E N G I N E A I R I N L E T A N D E X H A U S T S Y S T EM S Y S T E M S O P E R A T I O N charger turbine wheel and compressor wheel to turn faster. The increased rpm of the compressor wheel increases the quantity of inlet air. As the turbocharger provides additional inlet air, more fuel can be burned. This results in more horse- power from the engine. TURBOCHARGER 1. Air inlet. 2. Compressor wheel. 3. Oil inlet passage, 4. Turbine wheel. 5. Exhaust outlet. 6. Oil outlet. 7. Exhaust inlet. Maximum rpm of the turbocharger is controlled by the rack setting, the high idle speed setting and the height above sea level at which the engine is operated. CAUTION If the high idle rpm or the rack setting is higher than given in the FUEL SETTING INFORMA- TION (for the height above sea level at which the engine is operated), there can be damage to engine or turbocharger parts. The bearings for the turbocharger use engine oil for lubrication. The oil comes in through oil inlet (3) and goes through passages in the center section for lubrication of the bearings. Oil from the turbocharger goes out through oil outlet (6) in the bottom of the center section and goes back to the engine oil pan. CYLINDER HEAD AND VALVES There is one cylinder head for all four cylinders. Each cylinder has one intake and one exhaust valve. Each intake and exhaust valve has a valve rotator. The valve rotator causes the valve to turn a small amount each time the valve opens and closes. This action helps keep carbon deposits off of the valve face and valve seat. The cylinder head has valve seats installed and they can be replaced. The valve guides can be replaced. There are threads on the inside diameter of the valve guides to hold oil that lubricates the valve stem. VALVE MECHANISM The valve mechanism controls the flow of intake air and exhaust gases in and out of the cylinders. The valve mechanism consists of rocker arms, push rods, valve lifters and camshaft. The camshaft is driven by and timed to the crank- shaft. When the camshaft turns, the camshaft lobes move the valve lifters up and down. The valve lifters move the push rods which move the rocker arms. Movement of the rocker arms make the intake and exhaust valves open according to the firing order (injection sequence) of the engine. A valve spring for each valve makes the valve go back to the closed position and holds it there. 3-12

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