Table of ContentTable of Content• Air system components:

• Precleaner.• Air cleaner.• Turbocharger.

Advantages of turbocharger.

• Aftercooler. Types of aftercoolers.

• Exhaust manifold.• Exhaust pipe.

• Air intake & exhaust system operation.

The Air Inlet and Exhaust System contains the following major components:

• Precleaner.• Air cleaner.• Turbocharger.• Aftercooler.• Cylinder head, valves, & pistons.• Exhaust manifold.• Exhaust pipe.

Air System ComponentsAir System Components

AIR INTAKE AND EXHAUST SYSTEM COMPONENTSAIR INTAKE AND EXHAUST SYSTEM COMPONENTS

1. Precleaner. 2. Air cleaner. 3. Turbocharger.

4. Aftercooler. 5. Air intake manifold. 6. Exhaust manifold.

7. Muffler. 7. Exhaust pipe.

Simple Cap PrecleanerSimple Cap Precleaner• The precleaner is located before the inlet to the main air cleaner.

• Precleaner function is to collect much of the dirt before the air cleaner = increases the service life of the air cleaner.

Dust collection bowlDust collection bowl• A spirally vaned drum that spins incoming air.

Turbine precleanerTurbine precleaner

Several different types of air cleaners currently available on Caterpillar engines

Air CleanerAir Cleaner

Always refer to the OMM of the engine for the most accurate maintenance procedures.

Dry Element Air CleanerDry Element Air Cleaner• Most common type of air cleaners.

Dry Element CleaningDry Element Cleaning

• Maximum pressure of 207 KPa (30 psi).

• Clean side out.

AIRSEP® FiltersAIRSEP® Filters

• High performance marine applications.• Allow a high volume of air flow with little restriction, but still clean.

Typical Service IndicatorTypical Service IndicatorMonitors the amount of restriction through the air cleaners.

TurbochargerTurbocharger

Compressor wheel draws air in, compresses it, anddelivers it under pressure to the cylinders.

Driven by exhaust gases.

Turbocharger OperationTurbocharger Operation

Air-to-Air Aftercooler (ATAAC)Air-to-Air Aftercooler (ATAAC)

Jacket Water Aftercooler (JWAC)Jacket Water Aftercooler (JWAC)

Separate Circuit Aftercooler (SCAC)Separate Circuit Aftercooler (SCAC)

AIR INTAKE AND EXHAUST SYSTEM OPERATIONAIR INTAKE AND EXHAUST SYSTEM OPERATION

1. Precleaner. 2. Air cleaner. 3. Turbocharger.

4. Aftercooler. 5. Air intake manifold. 6. Exhaust manifold.

7. Exhaust pipe. 8. Muffler.

Intake StrokeIntake Stroke

Compression StrokeCompression Stroke

Power StrokePower Stroke

Exhaust StrokeExhaust Stroke

AIR INTAKE AND EXHAUST SYSTEM OPERATIONAIR INTAKE AND EXHAUST SYSTEM OPERATION

1. Precleaner. 2. Air cleaner. 3. Turbocharger.

4. Aftercooler. 5. Air intake manifold. 6. Exhaust manifold.

7. Muffler. 8. Exhaust pipe.

Exhaust FlowExhaust Flow