Lesson 2/Learning Event 1
LESSON 2
FUNDAMENTALS OF COMPRESSION-IGNITION ENGINES
TASK
Describe the fundamentals of compression-ignition engines.
CONDITIONS
Given information about the construction and principles of operation of the two- and four-stroke-cycle
compression-ignition engines and the different types of compression-ignition engines.
STANDARDS
Solve 70 percent of the multiple-choice test items covering fundamentals of compression-ignition engines.
REFERENCES
TM 9-8000
Learning Event 1:
DESCRIBE PRINCIPLES OF OPERATION AND CONSTRUCTION OF FOUR-STROKE-
CYCLE ENGINES
The Army is presently using two types of straight diesel fuel engines. They are the two- and four-stroke-cycle
diesel engines. These engines are of many different sizes and shapes. Some are in-line engines, like those
found in the 2 1/2- and 5-ton vehicles, while others have V-type cylinder arrangements, like those found in the
high mobility multipurpose wheeled vehicle (HMMWV) and the commercial utility cargo vehicle (CUCV).
Common in-line types generally have four or six cylinders. The V-type usually have six or eight cylinders.
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