﻿GET_GEVOMechL2_05_01_01_50 - ANIMATION Screen
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Describe how the combustion air system operates.

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The turbocharger draws air into the combustion air system through V-screens.

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The air flows through eight plastic air cleaner panels.

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An exhauster blower discharges the dirty air from the air cleaner panels into the radiator cab.

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The clean air from the air cleaner panels fills the combustion air filter compartment.

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Five baggy filters provide the final filtration of the air entering the turbocharger.

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The turbocharger compresses the filtered air and sends it to the water-based intercooler which provides the first stage of cooling.

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If necessary, the air-based intercooler provides the second stage of cooling.

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If not, the air passes through the air-based intercooler to the intake air manifold on the engine.

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The intake air manifold distributes the cooled, compressed air to each power assembly on the engine.

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The exhaust air from the power assemblies spins the turbine blades in the turbocharger before exiting the exhaust stack.

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Describe the protection strategies used with the combustion air system.

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Hot Pre-Turbine Protection: When either pre-turbine temperature signal as read by the PTRT or PTLT sensor is hot, the available horsepower from the engine is reduced to protect the turbocharger from damage.

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Turbo Overspeed Protection: When the turbo speed signal as read by TRS sensor is high, the available horsepower is reduced to prevent damage to the turbocharger bearings.

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Turbo Surge Protection: When a turbo surge is detected, the engine speed is raised or the available horsepower is lowered to prevent damage to the turbocharger.

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High Air Filter Differential Pressure Protection: The EAFP sensor measures the pressure in the combustion air filter compartment.

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When the EAFP sensor value falls below the BAP sensor value, air flow through the baggy filters is being restricted, indicating dirty filters.

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Describe how to perform running maintenance related to the combustion air system.

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The recommended running maintenance schedule associated with the combustion air system and its major components are as follows:

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Inspect the combustion air system and the diesel engine daily or after every trip.

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While the engine is idling, make a visual inspection of all system piping, the water-based intercooler, and the air-based intercooler for air leaks.

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Make corrections as necessary.

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Then, check the exhaust manifolds for leaks, cracks, and broken welds.

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Visually inspect the turbocharger discharge ducts for tears or holes in the silicone layer.

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Replace if any damage is found.

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Inspect the air-based intercooler every 184 days.

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Inspect the intercooler for any air leakage.

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Check for any debris or dirt on the heat exchangers.

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Run Self-Test 407 and 408 to verify that the fans operate properly.

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Inspect the shutter mechanism for looseness or wear.

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Run Self-Test 327 and 328 to verify that the shutters operate properly.

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Replace the engine baggy filters every 184 days.

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Every year, lubricate the air-based intercooler fan bearings, following the specifications.

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Lubricate the bearings of the exhauster blower every three years.
