ASE A1 Engine Repair Practice Test

11. After diagnosing and replacing the cooling system's water pump, the vehicle's engine continues to overheat. Which of these is the MOST likely cause.

  • A. An air pocket in the system.
  • B. Leaking head gasket.
  • C. Faulty replacement water pump.
  • D. The radiator.

11.

Answer A is correct. Air pockets occur after draining the engine's coolant. Some vehicle's are more prone to this problem than others.

Answer B is wrong. A leaking head gasket would result in gases escaping the seal and fluids such as coolant leaking in. The vehicle would likely emit white smoke from its tailpipe as coolant burns in the combustion chamber.

Answer C is wrong. A faulty replacement water pump is not the most likely answer.

Answer D is wrong. The radiator is not the most likely answer. Answer A is correct.

12. Two technicians are discussing engine sealants and form in place gaskets. Technician A says sealants such as RTV are aerobic. Technician B says some sensors may be damaged if an unapproved sealant is used. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

12.

Answer A is wrong. Both technicians are correct. RTV (Room Temperature Vulcanizing) is an aerobic sealant meaning that it cures in the presence of air.

Answer B is wrong. Both technicians are correct. Keep RTV away from sensors.

Answer C is correct. Anaerobic sealers are usually used on smooth, machined components. They dry in the absence of air.

Answer D is wrong. Both technicians are correct.

13. An engine has a noise that goes away as the engine warms and reaches operating temperature. Which of these is the MOST likely cause.

  • A. Loose main bolt.
  • B. Loose connecting rod bolt.
  • C. Piston to wall clearance.
  • D. Loose intake manifold.

13.

Answer A is wrong. A loose main bolt is not likely to go away as the engine reaches operating temperature.

Answer B is wrong. A spun connecting rod bearing is not likely to go away as the engine reaches operating temperature.

Answer C is correct. As the piston expands, the clearance between it and the cylinder wall decreases, and so does the noise known as piston slap.

Answer D is wrong. A loose intake manifold will cause low vacuum.

14. An engine suffers from detonation. Technician A this may be caused from a defective EGR valve. Technician B says advanced ignition timing can cause this condition. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

14.

Answer A is wrong. Both technicians are correct.

Answer B is wrong. Both technicians are correct.

Answer C is correct. A stuck closed EGR valve will cause ping (detonation) while a stuck open valve will cause an engine to stumble and stall.

Answer D is wrong. Both technicians are correct.

15. Technician A says faulty turbocharger bearings will result in a loss of engine oil. Technician B says a dirty turbocharger air filter will result in a loss of engine oil. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

15.

Answer A is correct. Faulty turbocharger bearings will result in oil seal failure.

Answer B is wrong. A dirty turbocharger air filter can result in blade damage.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.