ASE test T2 Practice test 2
A high-pressure injection line is leaking on a pump-line nozzle (PLN) diesel engine. The line has been
torqued to specification. Which of the following should the technician do first?
A. Replace the line
B. Tighten the line
C. Remove and inspect the line
D. Replace the line and matching fitting - C. Remove and inspect the line (The line should be
removed and inspected)
A diesel engine that has high oil consumption also has oil in the charge air cooler. Technician A says the
air compressor oil drain line may be restricted. Technician B says the turbocharger oil drain line may be
restricted. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - B. B only (Only Technician B is correct. A restricted turbo oil drain in line can
cause the turbo seals to leak and allow oil to travel into the charge air cooler.)
Which of the following would be used to check liner installed height?
A. Dial indicator/ Sled gage
B. Inside micrometer
C. Outside micrometer
D. Dial caliper - A. Dial indicator/ Sled gage ( A Dial indicator, sometimes known as a sled gage, is
normally used to check liner installed height)
,The fuel drains back to the tank after sitting overnight, which of the following could be the cause?
A. A stuck open return check valve
B. A stuck closed return check valve
C. A restricted supply line
D. A restricted return live - A. A stuck open return check valve ( A stuck open return check valve
can allow fuel to drain back to the tank if the return line is not in submerged fuel)
In reference to the illustration technician A says that when replacing a turbocharger assembly, the drain
line should be checked for restriction. Technician B says that turbochargers are often recored by
replacing the center housing as a unit and reusing the old compressor and turbine housing, who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A or B - C. Both A and B (both technicians are correct. When replacing a turbo charger,
it is a good practice to inspect the oil supply and return lines to ensure proper lubricant flow at the
replacement turbo charger. This can reduce the chances of the replacement turbo failing. Technician B is
also correct. Turbo chargers can recored; this helps to reduce repair costs, requiring can only be
performed if both the turbine and impeller housing's are in good condition).
A diesel engine shows an abnormally high reading on the temperature gauge, and the top radiator hose
is cold. which of the following is the most likely cause?
A. Stuck open thermostat
B. Stuck closed thermostat
C. Restricted radiator
D. Restricted charge air cooler - B. Stuck closed thermostat ( A stuck closed thermostat would
allow the engine to overheat and the top radiator hose to be cold because the coolant is not circulating)
A diesel engine is using too much oil. All of the following could be the cause EXCEPT
, A. Worn piston rings
B. Worn valve guides
C. Worn valve seats
D. Loose oil pan fasteners - C. Worn valve seats (work valve seats can cause low compression, but
will not cause oil consumption)
The regulating valve on a fuel injection pump is stuck open. This will result in:
A. Low fuel-supply pressure
B. High fuel-supply pressure
C. Engine overheating
D. Low oil pressure - A. Low fuel-supply pressure ( The regulating valve helps to hold pressure in
the low pressure fuel system; if it were stuck open, the fuel pressure would be low)
A diesel engine equipped with a common-rail fuel system blows excessive smoke. Technician A says the
boost pressure sensor may be faulty. Technician B says the coolant temperature sensor may be faulty.
Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - A. A only (Only Technician A is correct. A failed boost pressure sensor could
cause the electronic control module (ECM) to over-fuel the engine, resulting in black smoke)
All of the following must be checked after a diesel cylinder head has been milled EXCEPT:
A. Injector tip protrusion
B. Intake valve head protrusion
A high-pressure injection line is leaking on a pump-line nozzle (PLN) diesel engine. The line has been
torqued to specification. Which of the following should the technician do first?
A. Replace the line
B. Tighten the line
C. Remove and inspect the line
D. Replace the line and matching fitting - C. Remove and inspect the line (The line should be
removed and inspected)
A diesel engine that has high oil consumption also has oil in the charge air cooler. Technician A says the
air compressor oil drain line may be restricted. Technician B says the turbocharger oil drain line may be
restricted. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - B. B only (Only Technician B is correct. A restricted turbo oil drain in line can
cause the turbo seals to leak and allow oil to travel into the charge air cooler.)
Which of the following would be used to check liner installed height?
A. Dial indicator/ Sled gage
B. Inside micrometer
C. Outside micrometer
D. Dial caliper - A. Dial indicator/ Sled gage ( A Dial indicator, sometimes known as a sled gage, is
normally used to check liner installed height)
,The fuel drains back to the tank after sitting overnight, which of the following could be the cause?
A. A stuck open return check valve
B. A stuck closed return check valve
C. A restricted supply line
D. A restricted return live - A. A stuck open return check valve ( A stuck open return check valve
can allow fuel to drain back to the tank if the return line is not in submerged fuel)
In reference to the illustration technician A says that when replacing a turbocharger assembly, the drain
line should be checked for restriction. Technician B says that turbochargers are often recored by
replacing the center housing as a unit and reusing the old compressor and turbine housing, who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A or B - C. Both A and B (both technicians are correct. When replacing a turbo charger,
it is a good practice to inspect the oil supply and return lines to ensure proper lubricant flow at the
replacement turbo charger. This can reduce the chances of the replacement turbo failing. Technician B is
also correct. Turbo chargers can recored; this helps to reduce repair costs, requiring can only be
performed if both the turbine and impeller housing's are in good condition).
A diesel engine shows an abnormally high reading on the temperature gauge, and the top radiator hose
is cold. which of the following is the most likely cause?
A. Stuck open thermostat
B. Stuck closed thermostat
C. Restricted radiator
D. Restricted charge air cooler - B. Stuck closed thermostat ( A stuck closed thermostat would
allow the engine to overheat and the top radiator hose to be cold because the coolant is not circulating)
A diesel engine is using too much oil. All of the following could be the cause EXCEPT
, A. Worn piston rings
B. Worn valve guides
C. Worn valve seats
D. Loose oil pan fasteners - C. Worn valve seats (work valve seats can cause low compression, but
will not cause oil consumption)
The regulating valve on a fuel injection pump is stuck open. This will result in:
A. Low fuel-supply pressure
B. High fuel-supply pressure
C. Engine overheating
D. Low oil pressure - A. Low fuel-supply pressure ( The regulating valve helps to hold pressure in
the low pressure fuel system; if it were stuck open, the fuel pressure would be low)
A diesel engine equipped with a common-rail fuel system blows excessive smoke. Technician A says the
boost pressure sensor may be faulty. Technician B says the coolant temperature sensor may be faulty.
Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - A. A only (Only Technician A is correct. A failed boost pressure sensor could
cause the electronic control module (ECM) to over-fuel the engine, resulting in black smoke)
All of the following must be checked after a diesel cylinder head has been milled EXCEPT:
A. Injector tip protrusion
B. Intake valve head protrusion
