CH. 48 ENGINE MECHANICAL PROBLEMS TEST

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1 TERRY FOX AUTOMOTIVE CH. 48 ENGINE MECHANICAL PROBLEMS TEST WHEN YOU ARE DONE THIS TEST GUESS WHAT YOU THINK YOU WILL RECEIVE FOR A MARK BELOW. IF YOU ARE WITHIN 2 MARKS YOU WILL RECEIVE 2 BONUS MARKS. I THINK I WILL RECEIVE /30

2 Chapter 48 Engine Mechanical Problems Test Student Name: Date: Multiple Choice: (one mark each) 1. With a gasoline engine, blue-grey smoke indicates: a. Rich fuel mixture b. Coolant leakage into combustion chambers c. Oil leakage into combustion chambers d. Lean fuel mixture 2. Low cylinder compression cannot be cause by: a. Worn camshaft bearings b. Blown head gasket c. Burned valve d. Worn piston rings 3. An automobile is brought into the shop. A compression test on the engine indicates low compression stroke pressure in all the engine s cylinders. Technician A says a complete engine overhaul is required to repair this problem. Technician B says before overhauling the engine you should check for other mechanical problems that would affect engine compression. Who is right? 4. Technician A says when inspecting an engine for mechanical troubles, you should look for engine oil leaks. Technician B says when inspecting an engine for mechanical troubles, you should look for vacuum leaks. Who is right? 5. Technician A says a leaking gasket is a common engine mechanical problem. Technician B says a burned valve is a common engine mechanical problem. Who is right? 6. Which of the following is a common cause of engine mechanical problems? a. Engine overheating b. Lack of periodic maintenance c. High engine mileage d. All of the above

3 7. The oil in an automotive engine has a white milky appearance. Technician A says this indicates engine coolant is probably leaking into the engine. Technician B says this indicates transmission fluid is probably leaking into the engine. Who is right? 8. An engine is brought into the shop with oil fouled spark plugs. Technician A says this problem is probably caused by an ignition system malfunction. Technician B says this problem is probably caused by internal oil leakage into the engine s combustion chambers. Who is right? 9. Oil is present in an automobile engine s coolant. Technician A says this problem is normally the result of worn valve seals. Technician B says this problem is usually caused by a leak in the radiator transmission oil cooler. Who is right? 10. An automobile s engine is producing crankcase blowby. Technician A says the solution to this problem is simple valve adjustment. Technician B says the solution to this problem normally requires extensive engine repair. Who is right? 11. Technician A says engine vacuum leaks are normally loudest at highway speeds. Technician B says engine vacuum leaks are normally loudest during engine cranking. Who is right? 12. Blue-grey smoke is coming out of an automobile s exhaust. Technician A says this condition normally indicates water in the engine s oil supply. Technician B says this condition normally indicates internal engine mechanical problems. Who is right?

4 13. Black smoke is coming out of a gasoline engine s tailpipe. Technician A says this normally indicates an engine mechanical problem. Technician B says this condition normally indicates a fuel system problem. Who is right? 14. White exhaust smoke is coming out of a gasoline engine s tailpipe. Technician A says white exhaust smoke may indicate an internal coolant leak into the engine s cylinders. Technician B says white exhaust smoke may be due to water condensation on a cool day. Who is right? 15. An automobile equipped with a diesel engine is brought into the shop. The customer says there is blue smoke coming out of the engine s exhaust. Technician A says this problem may be due to worn engine cylinders. Technician B says this problem may be due to worn valve seals. Who is right? 16. Technician A says a gasoline engine compression gauge can be used to perform a compression test on a diesel engine. Technician B says a gasoline engine compression gauge should not be used to perform a diesel engine compression test. Who is right? 17. Diesel engine compression readings should average approximately: a psi b psi c psi d psi 18. Valve train problems can cause all of the following except: a. Oil consumption b. Rough idle c. Crankshaft damage d. Engine missing

5 19. Technician A says that leaking valve stem seals will cause the engine to emit blue smoke after initial starting. Technician B says that the cylinder head must generally be removed to replace the valve stem seals. Who is right? 20. Technician A says that valve float can be caused by hydraulic lifter problems. Technician B says that valve float can be the result of weak valve springs. Who is right? 21. Technician a says that worn rocker arms can upset valve clearance. Technician B says that worn rocker arms have little effect on engine performance. Who is right? 22. All of the following are caused by blown head gasket except: a. Overheating b. Head damage c. Excess valve clearance d. Coolant leaks 23. Technician A says that a leaking intake manifold gasket can cause a vacuum leak. Technician B says that a high vacuum gauge reading indicates a blown head gasket. Who is right? 24. Technician A says that piston slap is generally loudest when the engine is warm. Technician B says that piston slap is caused by excessive piston skirt wear. Who is right 25. Technician A says that rod knock is a light, regular rapping noise that occurs when the engine is accelerating. Technician B says that rod knock is loudest when the engine is cold. Who is right?

6 26. Technician A says that main bearing knock is duller in pitch than rod bearing knock. Technician B says that main bearing wear will significantly reduce oil pressure. Who is right? 27. Excess crankshaft end play is caused by: a. Worn rod journals b. Worn crank throws c. Worn thrust bearings d. Worn connecting rods True or False: (one mark each) 28. True or False - A section of vacuum hose can be used to find engine vacuum leaks. 29. True or False If a cylinders compression increases when doing a wet compression test after a dry compression test it means that the compression rings are faulty. 30. True or False A leaking intake manifold gasket can cause a vacuum leak, with a resulting rough idle. TOTAL MARK /30 BONUS /2 FINAL MARK /30

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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