ASE A1 Engine Repair Practice Test

36. A vehicle's cooling system is loosing coolant. There is corrosion found around the aluminum water pump. Which of these is MOST likely to cause this condition.

  • A. Stuck open thermostat.
  • B. Electrolysis.
  • C. Loose radiator cap.
  • D. Faulty head gasket.

36.

Answer A is wrong. A stuck open thermostat will cause a vehicle to take too long to reach operating temperature. It can also cause unwanted hot spots.

Answer B is correct. Electrolysis causes corrosion of dissimilar metals in a cooling system. The weaker metal of the two (aluminum) will corrode.

Answer C is wrong. A loose radiator cap will cause an engine to overheat.

Answer D is wrong. A faulty head gasket will result in gases and compression leaking from the compression chamber.

37. A technician installs a radiator pressure tester on the radiator of a cold engine. After starting the engine the pressure quickly rises to 18 psi. Technician A says this is a normal condition. Technician B says the engine has a leaking cylinder head gasket. Who is correct?

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

37.

Answer A is wrong. It should take time for the pressure to build.

Answer B is correct. A leaking head gasket will force combustion into the coolant system causing an increase in system pressure.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

38. Two Technicians are discussing a PCV system. Technician A says a stuck closed PCV valve could cause external oil leaks. Technician B says that the PCV system removes blowby gases from the engine case. Who is correct?

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

38.

Answer A is wrong. Excessive pressure builds in the PCV system causing oil to bypass engine seals.

Answer B is wrong. Both technicians are correct.

Answer C is correct. The PCV system is a one-way system that allows blowby gas from the crankcase to flow into the intake manifold for recombustion. It helps keep the crankcase and engine oil clean.

Answer D is wrong. Both technicians are correct.

39. An OHC engine has recently had the cylinder head replaced. The engine runs rough and stumbles. Technician A says this may be caused by incorrect valve lash adjustment. Technician B says that only in-block camshafts require valve lash adjustments. Who is correct?

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

39.

Answer A is correct. It is common to adjust the valves when tuning or after replacing the cylinder head.

Answer B is wrong. Many engine designs require valve adjustments.

Answer C is wrong. Technician A is correct. Always make sure the valve lash is correct.

Answer D is wrong. Technician A is correct. Adjust and check valves and springs after a cylinder head has been installed.

40. Technician A says worn valve springs result in valve float at wide open throttle. Technician B says valve springs should be inspected for squareness with a square and a feeler gauge. Who is correct?

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

40.

Answer A is wrong. A worn valve spring will float.

Answer B is wrong. A floating valve spring can cause damage to other components. Use a square and a feeler gauge to check valve spring squareness.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.