ASE A1 Engine Repair Practice Test

6. Technician A says to use a machinist rule to measure valve tip installed height. Technician B says to use an outside micrometer to measure valve spring squareness. Who is correct?

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

6.

Answer A is correct. Use a machinist rule to measure valve tip installed height.

Answer B is wrong. Use a machinist rule to measure valve spring installed height.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Use a square and a feeler gauge to check valve spring squareness.

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7. Technician A says oil viscosity changes with engine temperature. Technician B says a faulty oil cooler could result in a coolant leak. Who is correct?

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

7.

Answer A is wrong. When the engine is running hot, the oil is also running hot—too much heat results in thermal breakdown.

Answer B is wrong. Oil coolers can leak coolant or oil. Inspect the gasket and oil cooler o-ring for leaks.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

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8. A vehicle with an eight-cylinder engine and a manual transmission has a knocking sound at the back of the engine whenever the engine is running. Which of these could be the cause?

  • A. A worn timing belt.
  • B. A loose harmonic balancer.
  • C. Loose flywheel bolts.
  • D. A faulty power steering pump.

8.

Answer A is wrong. A loose and worn timing belt makes a flapping sound at the front of the engine.

Answer B is wrong. A loose harmonic balancer makes a knocking noise a the front of the engine.

Answer C is correct. Manual transmissions have flywheels that absorb engine pulses transferred through the crankshaft. Loose flywheel (manual transmission) or flexplate (automatic transmission) bolts make a knocking noise at the back of the engine whenever the engine is running.

Answer D is wrong. A faulty power steering pump makes a moaning or whining noise at the front of the engine that gets louder during turns.

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9. The oil pressure switch on an engine may be faulty. All of the following are true about oil pressure switches EXCEPT:

  • A. Test this switch with a digital multimeter.
  • B. The warning lamp turns off as oil pressure rises.
  • C. This sensor is a variable resistor.
  • D. Set the meter to Ohms to check for continuity.

9.

Answer A is wrong. Use a digital multimeter set to Ohms. They can be tested for operation with the engine not running and then with the engine running.

Answer B is wrong. Oil pressure switches are usually normally closed switches; this is why the oil pressure warning light illuminates when the ignition is first turned on and goes out after the engine starts and oil pressure rises.

Answer C is correct. The switch contacts are either open or closed; variable resistors have many positions.

Answer D is wrong. Set the meter to Ohms to check for continuity.

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10. During a cylinder leakage test, a hissing sound is heard coming from the throttle body. This sound indicates:

  • A. The engine has a bad exhaust valve.
  • B. The engine has worn piston rings.
  • C. The engine has a bad intake valve.
  • D.The engine has a leaking head gasket.

10.

Answer A is wrong. A hissing sound from the tailpipe indicates a leaking exhaust valve or seat. The exhaust valve leads to the exhaust manifold /tailpipe.

Answer B is wrong. If air is escaping through the PCV outlet, the piston rings are faulty.

Answer C is correct. A leaking intake valve will result in a hissing sound from the throttle body. It can be heard by removing the air tube and opening the throttle plate. The intake valve is leaking air into the intake manifold.

Answer D is wrong. A faulty head gasket or a crack in the blocks deck area or cylinder head allows compression to leak into the coolant jacket. It results in air bubbles appearing in the radiator neck. It can be heard by removing the air tube and opening the throttle plate. The intake valve is leaking air into the intake manifold.

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