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Engine Measurement

# Engine Measurement - A EN 201 Agricultural Power Units...

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A EN 201 – Agricultural Power Units Measuring Engine Wear Objectives : The Student Will Be Able To: 1. Describe the importance of measuring engine wear; 2. Describe how to measure cylinder wear; 3. Describe how to measure piston ring gap; 4. Describe how to measure the crankshaft; 5. Describe how to measure the cam shaft; 6. Describe how to measure valve wear; and 7. Appraise wear measurements and make repair judgments according to wear. Required Reading For Quiz : 1. This laboratory chapter I. Introduction : Even though the internal working parts of an engine are not seen, they are the most important. These parts are so very important because of the jobs that they perform, and because of the intense work pressure that they endure. For these reasons, the internal moving parts of an engine must be made of high quality materials and they must be precise. Throughout this laboratory, the precision of these parts will be checked. Even though the parts are made of high quality materials, they are still subject to wear. II. Measuring Cylinder Wear : The cylinder wall of an internal combustion engine does not wear uniformly from top to bottom. The only area of severe wear is the part of the cylinder wall where the rings move from top to bottom. The wear is usually greater just below the top of the ring travel and decreases as the piston travels toward the bottom of its stroke. To get an accurate measurement on the cylinder, it is recommended that six different measurements be taken. Measurements should be taken in pairs - two at the upper area of ring wear, two at the middle of ring wear, and the last two at the lower end of ring wear, (Figure, 4.1). At each of these positions one measurement should be taken parallel to the crankshaft and one taken perpendicular to the crankshaft. By using this method, any out-of-roundness and/or taper can be determined.

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