30886 v1 Ans- 2024 Theory Wrkbook.docx

30886 Diagnose the mechanical condition of an engine Theory Workbook-Answer Sheet   Name -------- -- Date School **Research Task** 1\. Before carrying out an engine inspection, you need to be aware of all the hazards and danger ar...

30886 Diagnose the mechanical condition of an engine Theory Workbook-Answer Sheet   Name -------- -- Date School **Research Task** 1\. Before carrying out an engine inspection, you need to be aware of all the hazards and danger areas. List one safety precaution you will follow to prevent damage to equipment or injury to persons: a\) Cooling system: *Do not over pressurise the cooling system. It may damage components if it's pressurised higher the manufacturer's specification.* b\) Lubrication system: *Make sure the correct oil viscosity is used according to the manufacturer's specification.* c\) Battery: *Make sure the correct battery terminals are connected to the correct battery post.* d\) Ignition system: *Keep your hands away from the spark plug wires and ignition coil packs while the engine is running.* e\) Belts and fans: *Keep your hands away from the belts and fan while the engine is running.* f\) The fuel system: *Depressurise fuel system before removing any components.* 2\. List three problems that can be created by the driving belts being loose: a It can result in fluctuating voltage output from the alternator. b\. It will cause squealing or wining noises c\. Lack of power on the power steering pump. 3\. Give one reason why electrical voltage readings may be incorrect? Incorrect selection on the multi meter or faulty wiring or components. 4\. List the four steps you will follow to check the engine lubricating system. - *Inspect flexible hoses for cracks, punctures and wear.* - *Check tubing/pipe for flattening or breaks.* - *Check for leaking or "weeping" at all connections; check tightness of connections but avoid over-tightening.* - *Monitor system for unusual drops or increases in operating pressure.* 5\. Which is the correct way to remove the high-tension leads? A.................................... 6\. Why is it good practice to keep the spark plugs in the order they are removed from the engine?  *It is important that you keep them in order until you examine each plug to* *determine* any faults or issues pertaining to that particular cylinder. 7\. What would a normal spark plug look like at the electrode area? *A normal spark plug will have brown or grayish-tan deposits on the side electrode.* 8\. What would indicated by the plug electrode being burnt or blistered? *Blisters* on the insulator tip, melted *electrodes*, or white deposits are signs of a *burned* spark *plug* that is running too hot 9\. Yellow or white spots on the centre electrode of the plug are caused by? 10\. " New spark plugs taken straight from the box are already set at the correct gap" True  False  11\. What test can be used to determine the mechanical condition of each cylinder in the engine? 12\. How many cycles of the starter motor need to be cranked on each cylinder for this test? 13a. What component is shown in the diagram? 13b. Where will the part marked A be placed during the test? 14a. What will the tool shown in the diagram be used for? 14b. What is connected to section marked A? 14c. Where is the section marked B connected to? 15\. How can you identify where leakage is taking place in the engine? 16\. Leakage out through the oil filler cap would indicate what components are faulty? 17\. Where else would leakage from these same components be evident? 18\. Leakage through the air cleaner or through the carburettor would indicate what components are faulty? 19\. Leakage through the exhaust system would indicate what components are faulty? 20\. The first test will be number one cylinder. What position will the number one piston be at during this test? 21\. List four components that make up the low tension side of the ignition system. a b c d 22\. List four components that make the high tension side of the ignition system. a b c d 23a. Name the component shown in the diagram. 23b. What is its purpose? 36\. When will engine filters be changed? 37a. What sort of engine would use a filter like the one shown in the diagram below? 39a. What is the purpose of an engine air filter? 39b. What is the most common type of material used in air filter elements? 40\. What type of engine would use an air filter like the one shown in the diagram? 49\. Multi choice section. a. During a pre-tune inspection you should check for the following: (choose the best answer) 1. 2. 3. 4. 5. b. Ensuring safety in the workplace is the responsibility of: (choose the best answer) 6. 7. 8. 9. 10. 11. c. During a compression test: (choose the best two answers) 12. 13. 14. 15. 16. 17. d. After completing pre-tune tests and checks. What should be done with the results?: (choose the best answer) 18. 19. 20. 21. 22. 23. e. When fitting spark plugs to an engine: (choose the best answer) 24. 25. 26. 27. 28. 29. 50\. Fill in the information regarding the use and the purpose of the following tools. Tool Image of tool Job that the tool is used for during this task Purpose -------------- ------------------------ ------------------------------------------------ --------- Multimeter Feeler gauge Spanners Screwdrivers  Vacuum gauge Timing light ------------------- ------------------------ -- -- Gas analyser Socket set Air duster gun  Vacuum pump Engine tachometer **Compression Test**  ### 1\. What is the purpose of a compression test............................................................................................................................................................................................................................................................................................................................................................................ 2\. List the tools and equipment needed to do a compression test.............................................................................................................................................................................................................. 3\. List the safety gear (PPE) needed to carry out this task safely................................................................................................................................................................. 4\. List three fluid level checks you will carry out before start up......................................................................................................................... 5\. What type of leaks should you check after start up..................................................................................... 6\. Name the four types of compression tests that can be carried out on a vehicle......................................................................................................................................................................... 7\. What is the purpose to get the vehicle to operating temperature before carrying out a compression test?...................................................................................................................................................................................................................................................\... 8\. What would be the reason to carry out a cold compression test instead of a hot compression test?...................................................................................................................................................................................................................................................\... 9\. Name the two systems that needs to be disabled before carrying out a compression test................................................................................................... 10\. How would you disable the ignition system on a modern vehicle?........................................................................................................................................................................................................................\......................................................................................................................................................\... 11\. How would you disable the fuel system on a modern vehicle?......................................................................................................................................................................................................\........................................................................................................................................................................... 12\. Why is it important to number/label spark plug leads when removing from spark plugs.....................................................................................................................................\.................................................................................................................. 13\. Name the tools used to remove the spark plugs........................................................................................................................................... 14\. Explain how the compression gauge is fitted to the engine to carry out the test?..............................................................................................................................\........................................................................................................................ 15\. Explain how you will obtain a stable reading when carrying out a compression test?................................................................................................................................................................................................................................................................................................................................................................................. 16\. Why is it important to record all cylinder compression readings?................................................................................................................................................................................................................................................................................................................................................................................. 17\. What is a wet compression test?................................................................................................................................................................................................................................................... **Leak Down Test**  1\. What personal safety gear is required when carrying this test?...........................................................................................................................\... 2\. What action should be taken before carrying a leak down test............................................................................................................................ 3\. Why is this step important?..................................................................................................................................................................................................................................................... 4.What is the purpose of this test?...........................................................................................................................\........................................................................................................................... 5.In what position should the piston be in?..............................................................................................................................\........................................................................................................................ 6\. On which stroke should the piston be on?........................................................................................................................... 7\. Why is it important for the piston to be on this stroke?...\.................................................................................................................................................................................................................................................. 8\. What is the reason for the components to be in this position?.......................................................................................................................... 9\. Name the components where cylinder leaks may occur?............................................................................................................................................................................ 10\. Name the equipment needed to carry out a Cylinder Leak down test?........................................................................................................................... 11\. What are the requirements to carry out this test?........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 12.Name the components that needs to be removed before carrying out this test................................................................................................................................................................................................................................. 13\. Name the component that has leakage in the following outcomes. a\) Air leaks through the air filter............................................ b\) Air leaks through the exhaust system............................................ c\) Air leaks through the cooling system and cause bubbles in coolant............................................. d\) Air leaks through the dipstick and oil filler point........................................................................................................................... 14\. What action is crucial when carrying the Cylinder Leak Down Test on various pistons?.........................................................................................................................