ASE A1 Engine Repair Practice Test

56. A vehicle is overheating, but returns to normal at idle. Both of the engine’s electric cooling fans are functioning correctly. Technician A says this could be caused by an internal restriction in the radiator. Technician B says an infrared thermometer is used to diagnose this problem. Who is correct?

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

56.

Answer A is wrong. Inspect the radiator for external damage and use an infrared thermometer to find internal restrictions.

Answer B is wrong. Infrared thermometers are helpful when diagnosing restrictions in the engine's cooling system.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

57. A metallic knocking sound is heard behind an engine's harmonic balancer. An oil pressure test indicates oil pressure is below specifications. Technician A says the engine's main bearing inserts should be inspected for wear. Technician B says a worn thin crankshaft thrust bearing will cause this condition. Who is correct?

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

57.

Answer A is wrong. Both technicians are correct. Front main bearings can wear from too much belt tension. Engine bearings are designed to wear before damage to the crankshaft or block occurs.

Answer B is wrong. Worn thrust bearings will result in excessive crankshaft end-play. The oil pan should be removed and the parts inspected for wear. If brass is present in the bottom of the oil pan suspect worn engine bearings.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

58. A vehicle vibrates only when placed in reverse. The MOST likely cause of this condition is:

  • A. Crossed ignition wires.
  • B. A faulty fuel injector.
  • C. A faulty balance shaft.
  • D. A broken engine mount.

58.

Answer A is wrong. Crossed ignition wires would likely cause a vibration in other speeds and gears as well.

Answer B is wrong. A clogged or faulty fuel injector would likely cause a vibration in other speeds and gears as well.

Answer C is wrong. A faulty or improperly replaced balance shaft would cause a vibration while driving. This vibration will increase with vehicle speed.

Answer D is correct. A worn or broken engine mount would result in a vibration that is more pronounced in reverse or in drive.

59. Two technicians are discussing a turbocharged engine. Technician A says the wastegate is a component used to control boost pressure. Technician B says when opened, the wastegate diverts exhaust gas from the turbine wheel. Who is correct?

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

59.

Answer A is wrong. The wastegate is controlled by a valve and releases excess pressure back to the exhaust stream. This device is used to control intake manifold pressure.

Answer B is wrong. They are both right. When the gate opens exhaust bypasses the turbine wheel reducing intake manifold pressure.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

60. Technician A says that torque to yield bolts can always be reused. Technician B says that torque to yield bolts can be reused as long as they are cleaned and oiled before they are reinstalled and torqued. Who is correct?

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

60.

Answer A is wrong. Do to the nature of their design, torque to yield bolts or stretch bolts should not always be reused.

Answer B is wrong. Neither technician is correct. Cleaning a bolt that is stretched will not restore it to its original length.

Answer C is wrong. Neither technician is correct. This answer could be true if the TTY bolt passes all of the manufacturer's required specifications. Be careful when clamping cylinder heads with these bolts.

Answer D is correct. Neither technician is correct.

ASE A1 Engine Repair Quiz
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