Lesson 3
LESSON 3
ENGINE EXHAUST SYSTEMS
TASK
Describe the fundamentals of engine exhaust systems.
CONDITIONS
Given information about the location, purpose, construction, and inspection of engine exhaust systems.
STANDARDS
Answer 70 percent of the multiple-choice test items covering engine exhaust systems.
REFERENCES
TM 9-8000
Learning Event:
DESCRIBE THE COMPONENTS, CONSTRUCTION, AND INSPECTION OF EXHAUST SYSTEMS
INTRODUCTION
The internal combustion engine can be thought of as a mechanical device that breathes like a person or an
animal. On its intake stroke, an engine cylinder inhales, pulling in fresh fuel-air mixture. On its exhaust
stroke, the cylinder exhales, pushing the waste gases out.
Any defect that limits the inhaling or exhaling process seriously limits the power output. This lesson will
cover the exhaust system, which is the engine's exhaling system.
The exhaust system is a relatively simple part of a vehicle. However, it is a very important part of vehicle
maintenance. Above all, leaks in the system must be promptly repaired.
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