Troubleshooting Lab

Troubleshooting Lab - A EN 201 Agricultural Power Units...

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A EN 201 – Agricultural Power Units Troubleshooting Small Engines Objectives : The Student Will Be Able To: 1. List, summarize, and employ the 5 troubleshooting rules; 2. Interpret common symptoms of problems that occur in small engines; 3. Compile the information given in this laboratory section in order to diagnose and correct small engine problems throughout the remainder of the semester; and 4. Obtain a score of 75% or greater on a quiz focusing on the reading from the required reading. Required Reading For Quiz : 1. This laboratory chapter. 2. Chapter 13, Engines, Fundamentals of Service ; John Deere Troubleshooting : The skills involved in troubleshooting engine problems are very similar to the skills used by medical doctor in diagnosing health problems. As a troubleshooting "doctor", students must know the causes of certain symptoms that your mechanical patient might have. Luckily mechanical medical school or a residency is not required before attempting to work on a patient. All that is needed are the 5 simple rules to troubleshooting small engines. The five troubleshooting rules should be followed in sequence in order that the maximum amount of time and money be saved. These five rules are also very general, this allows them to work for just about all makes and models of small engines. Remember these 5 Rules for troubleshooting engine problems : 1. Spark 2. Compression 3. Accessories 4. Carburetion 5. Timing
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Rule #1 : Spark Spark refers to the high voltage spark that is created by the ignition system. Without spark the engine is completely unable to function. Checking the ignition for "Spark" is the first rule because of it's simplicity. To check to see if the ignition system is functioning properly a spark tester is used. As mentioned is Laboratory II there are numerous types and ways to test for "Spark", and they are all effective. If the ignition system is creating an adequate "Spark", but still does not start, continue on to Rule #2. If the ignition system fails to create a "Spark", check this list of items for possible solutions. 1. Check the spark plug, it may be faulty. 2. Check the armature air gap. 3. Check to see if the flywheel key is sheared. (Figure, 6.1 and 6.2) 4. Check for an incorrect breaker point gap. 5. Check for dirty or burned breaker points. 6. Check for a worn or stuck breaker plunger.
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Troubleshooting Lab - A EN 201 Agricultural Power Units...

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