Lubric Systems Lab

Lubric Systems Lab - A EN 201 Agricultural Power Units...

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A EN 201 – Agricultural Power Units Engine Lubrication Systems Objectives : The Student Will Be Able To: 1. Obtain a score of 75% or greater on a quiz focusing on Chapter 9, in John Deere’s Engines: FOS; 2. List the two common types of lubrication systems and describe how each works; 3. Identify, compare and contrast the sources of lubricants; 4. List the functions of lubricants; 5. Describe the basic lubrication principles; 6. Describe, compare/contrast, and utilize SAE and API ratings; and 7. Describe the basic function of PCV valves. Required Reading For Quiz : 1. Chapter 9, Engines, Fundamentals of Service ; John Deere I. Introduction : The internal combustion engine would be unable to operate if it were not for some sort of lubricating material and corresponding system for providing lubricants. Lubricating systems are challenged with providing an engine with an ample source of lubricant, which is free of abrasives and other harmful materials. It is the operator’s responsibility to provide the lubricating system with engine oil that is of the appropriate quality and viscosity. This laboratory and required reading will introduce students to lubrication system basics, lubrication principles, as well as technical information concerning the grading characteristics which lubricants are required to uphold. The lab will consist of a required reading quiz, brief lecture, and finally, a viscosity experiment. The following pages consist of Power Point notes and lab sheets. Required Materials : Eye Protection Red Rags Calculator Lab Manual
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Functions: The oil in the crankcase serves five functions. Oil: 1. Helps cool the engine by removing heat from the cylinder and moving parts. 2. Cleans by removing particles from the cylinder and moving parts; 3. Seals the rings to the cylinder wall; 4. Reduces friction by serving as a slippery film between all moving parts; and 5. Protects machined parts from rust and corrosion. Oil Circulation: The oil can be circulated throughout the engine by several methods. Some engines use a dipper attached to the connecting rod, (Figure, 1.1), which dips into the oil as the connecting rod moves. The oil is splashed so that all points within the block are constantly sprayed with oil. An oil slinger,(Figure, 1.2), is used on some engines and is driven by the camshaft. As the slinger rotates, the "ears" on the slinger throw oil throughout the inside of the engine. Various styles of oil pumps have been used in the lubrication systems of small engines. The pump is normally submersed in oil and directs oil to the connecting rod and main bearings by tubes or orifices in the discharge tube. The other parts of the engine are lubricated by the oil which is "thrown off" of the connecting rod and crankshaft. A “barrel type” oil pump is shown in Figure, 1.3.
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Lubric Systems Lab - A EN 201 Agricultural Power Units...

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