Lesson 4/Learning Event 1
LESSON 4
ENGINE LUBRICATION SYSTEMS
TASK
Describe the principles of engine lubrication and crankcase ventilation systems.
CONDITIONS
Given information about principles of operation and maintenance of engine lubrication and crankcase
ventilation systems.
STANDARDS
Solve 70 percent of the multiple-choice test items covering engine lubrication and crankcase ventilation systems.
REFERENCES
TM 9-8000
Learning Event 1:
DESCRIBE PRINCIPLES OF OPERATION AND COMPONENTS OF LUBRICATION
SYSTEMS
The lubrication and ventilation systems used on modern internal combustion engines are excellent examples of
good engineering design. The lubrication system must be designed so it will deliver a large amount of oil to
some of the parts while providing mere drops to other parts in the engine. Too much oil in some places can
cause as much trouble as too little. If, for example, the lubrication system delivered as much oil to the cylinder
walls as it does to the main bearings, the rings could not wipe off the excess oil fast enough. Some of the
excess oil would get by the rings into the combustion chamber where it would foul up the spark plugs, gum up
the chamber with carbon, and burn during the power stroke to be lost through the exhaust pipe. Too much oil
in the wrong places will also cause oil seals to fail and valves to stick.
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