Deck 7: Diesel Engine Cooling and Lubrication Systems

Question 1

Which of the following ingredients is added to diesel engine coolant to prevent cavitation?

A)Nitrite.
B)Silicate.
C)Ethylene glycol (EG).
D)Borate.

Answer 1

A

Question 2

The presence of cavitation on the coolant side of the cylinder wall is most likely caused by __________.

A)lubrication breakdown
B)excessive cylinder pressures
C)excessive cooling system pressure
D)improperly conditioned coolant

Answer 2

D

Question 3

Technician A says that blue antifreeze is long-life antifreeze. Technician B says that blue antifreeze is propylene glycol-based antifreeze. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Answer 3

B

Question 4

Technician A says that antifreeze is added to coolant to protect the coolant from freezing and to lower its boiling point. Technician B says antifreeze lowers the freeze point and raises the boiling point of coolant. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 5

Which antifreeze will require the highest concentration to maintain 0°F (−18°C) freeze protection?

A)Ethylene glycol (EG).
B)Propylene glycol

Question 6

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 7

Technician A says the problem with new long-life antifreeze is it can produce silicate dropout, which plugs cooling system passages. Technician B says that the problem with some types of long-life antifreeze is that it is not compatible with all cooling system materials. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 8

Technician A says the oil-pressure regulator automatically reduces oil pressure at low-speed and low-load conditions. Technician B says that two-stage pressure regulation is performed electronically to reduce fuel consumption. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 9

Which series of engine oils is used in a diesel engine?

A)S series.
B)ASTM.
C)C series.
D)SAE.

Question 10

The 15W in 15W-40 engine oil stands for which of the following?

A)Multiviscosity.
B)Viscosity at 0°F (−18°C).
C)Viscosity at 212°F (100°C).
D)The thickness of the oil when cold.

Question 11

Which of the following is the most recent engine oil made for a diesel engine?

A)SG-4.
B)CJ-4.
C)SJ.
D)FA-4.

Question 12

Diesel engine oil has which job of the following extra jobs to perform, which gasoline engines are not necessarily required to perform?

A)High-speed lubrication.
B)Cooling piston crowns.
C)Absorbing shock loading that engine parts can incur.
D)Sealing piston rings.

Question 13

Technician A says that low-sulfur oil needs to be used today to prevent damage to exhaust aftertreatment systems. Technician B says that today's oils should have low ash content. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 14

Technician A says that viscosity index (VI) improvers thicken oil when it becomes hot and thins it when it becomes cold. Technician B says that VI improvers thin oil when it's hot and thicken it when it's cold. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 15

What is the maximum percentage of soot loading that means engine oil needs to be changed?

A)2%.
B)5%.
C)10%.
D)20%.

Question 16

Technician A says that the cooling system pressurizes to enable coolant to remove more heat from the engine. Technician B says pressurization is needed to keep the coolant from boiling. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 17

Technician A says that diesel engine oil turns black faster than oil in an SI engine because the oil composition and quality are different between the two oils. Technician B says that there is no difference between diesel engine and SI engine oil. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 18

Which of the following is the normal operating oil temperature of a diesel engine?

A)20°F to 30°F (5°C to 14°C) lower than coolant temperature.
B)Close to cooling system operating temperature.
C)30°F to 40°F (−1°C to 4°C) above cooling system temperature.
D)Approximately 250°F (121°C).

Question 19

Which of the following will likely cause excessively high oil pressures?

A)A plugged oil filter.
B)A defective oil filter bypass valve.
C)A defective oil-pressure regulating valve.
D)A defective pressure-relief valve.

Question 20

Technician A says that spin-on oil filters in metal cans are being eliminated because they are less convenient and messy. Technician B says that cartridge-type filters are becoming more commonly used to allow them to be more easily disposed in a more environmentally friendly way. Who is correct?

A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question 21

The presence of cavitation on the coolant side of the cylinder wall is most likely caused by __________.

A)lubrication breakdown"
B)excessive cylinder pressures"
C)excessive cooling system pressure
D)improperly conditioned coolant"

Question 22

Technician A says that antifreeze is added to coolant to protect the coolant from freezing and to lower its boiling point. Technician B says antifreeze lowers the freeze point and raises the boiling point of coolant. Who is correct?

A)Technician A"
B)Technician B"
C)Both A and B
D)Neither A nor B"

Question 23

In current diesel engines, the coolant must reach _____ to enable onboard diagnostic (OBD) monitors or any emission control strategy within a reasonable time.

A)maximum temperature"
B)minimum temperature"
C)maximum oil pressure
D)minimum oil pressure"

Question 24

Increasing the pressure of the cooling system increases the coolant's:

A)temperature"
B)boiling point"
C)freeze point
D)level"

Question 25

Cooling systems must deaerate the coolant to prevent the pumps and coolant passageways in the cylinder head from becoming:

A)air bound"
B)blocked"
C)pressurized
D)water-bound"

Question 26

What is caused by the collapse of tiny water vapor bubbles formed when the coolant heats rapidly next to hot surfaces and/or when the coolant is subjected to a rapid drop in pressure?

A)Cavitation-erosion"
B)Overheating"
C)High pressure
D)Low temperature"

Question 27

Which of the following is used as an additive by both new and old formulations of antifreeze for diesel engines to minimize cavitation erosion?

A)Nitrite"
B)Carbon"
C)Silicone
D)Ethylene glycol"

Question 28

Technician A says that a drop in the coolant level in the surge tank or coolant overflow reservoir when the engine cools indicates an internal engine leak. Technician B says that the drop in the level is normal. Who is correct?

A)Technician A"
B)Technician B"
C)Both A and B
D)Neither A nor B"

Question 29

Antifreeze should be added to a minimum of ________ concentration because of the corrosion inhibitors it contains.

A)20%"
B)40%"
C)50%
D)60%"

Question 30

What has two different scales for measuring the freeze protection of PG and EG coolants?

A)Refractometer
B) Hydrometer
C)Manometer
D) Digital gauge

Question 31

What color is hybrid organic acid technology (HOAT) antifreeze coolant used in Daimler-Chrysler engines?

A)Green"
B)Blue"
C)Pink
D)Orange"

Question 32

Ethylene glycol (EG) antifreeze is an environmental hazard; therefore, old antifreeze must be properly disposed of:

A)by a recycler"
B)by a licensed recycler"
C)by pouring down the drain
D)along with your recycled engine oil"

Question 33

Technician A says that the pressure rating of a radiator cap at which the pressure-relief valve opens is stamped on the radiator. Technician B says that a vacuum valve incorporated into the cap allows air or coolant to reenter the cooling system when the pressure drops after the engine cools. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 34

What speeds up warm-up, when the engine is below its normal operating temperature, by blocking coolant flow from the engine to the radiator?

A)Thermostat"
B)Radiator"
C)Water pump
D)Surge tank"

Question 35

Two technicians are explaining the diesel engine lubrication system. Technician A says that it removes dirt, abrasives, and contaminants from inside the engine Technician B says the cooling system assists in sealing the combustion chamber by forming a film between the piston rings and the cylinder wall. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 36

Which of the following has imposed new demands on the lubrication system?

A)American Trucking Association"
B)TMC (Truck Maintenance Council)"
C)SAE (Society of Automotive Engineers)
D)US Congress"

Question 37

Which of the following has/have imposed new demands on the lubrication system?

A)Durability requirements"
B)Engine oil formulations"
C)SAE (Society of Automotive Engineers)
D)TMC (Truck Maintenance Council)"

Question 38

Oils now need to be compatible with the latest:

A)exhaust aftertreatment systems"
B)engine coolant formulations"
C)fuel system design
D)engine timing design"

Question 39

Which of the following major lubrication system components does NOT function to meet durability requirements?

A)Oil pump"
B)Oil pan"
C)Air cleaner
D)Oil cooler"

Question 40

Which of the following major lubrication system components does NOT function to meet durability requirements?

A)Oil filter(s)"
B)Oil sump"
C)Oil level dipstick
D)Oil-pressure regulating and pressure-relief valves"

Question 41

Technician A says that emission legislation and durability requirements impose new demands on the lubrication system. Technician B says that engine oil needs to be compatible with the latest exhaust aftertreatment systems. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 42

Diesel engine oil has which job of the following extra jobs to perform, which gasoline engines are not necessarily required to perform?

A)High-speed lubrication."
B)Cooling piston crowns."
C)Absorbing shock loading that engine parts can incur.
D)Sealing piston rings."

Question 43

Technician A says that viscosity index (VI) improvers thicken oil when it becomes hot and thins it when it becomes cold. Technician B says that VI improvers thin oil when it's hot and thicken it when it's cold. Who is correct?

A)Technician A"
B)Technician B"
C)Both A and B
D)Neither A nor B"

Question 44

What series oils are designated for use in compression-ignition engines?

A)C series"
B)S-series"
C)D-series
D)A-series"

Question 45

What area of the API donut identifies the oil's viscosity, which is a standard defined by the SAE?

A)Top"
B)Shaded"
C)Bottom
D)Center"

Question 46

Which of the following standards is designed for compatibility with biofuels and the latest exhaust aftertreatment systems?

A)FA-4"
B)CK-4"
C)CJ-4
D)FJ-5"

Question 47

The "F" in FA-4 designates the oil as a(n):

A)fuel economy oil"
B)anti-foaming oil"
C)minimal ash residue oil
D)DPF (Diesel Particulate Filter) oil"

Question 48

The use of _______ can introduce more soot into the oil, which requires oil to be better able to dissolve and hold soot in the lubricating oil until it can be removed by the filter.

A)SCR (Selective Catalyst Reduction)"
B)EGR (Exhaust Gas Recirculation)"
C)DEF (Diesel Exhaust Fluid)
D)DPF (Diesel Particulate Filter)"

Question 49

Technician A says that diesel engine oil turns black faster than oil in an SI engine because the oil composition and quality are different between the two oils. Technician B says that there is no difference between diesel engine and SI engine oil. Who is correct?

A)Technician A"
B)Technician B"
C)Both A and B
D)Neither A nor B"

Question 50

An oil analysis has been done and the results show a decrease in viscosity. Which of the following CANNOT be the cause?

A)Fuel dilution"
B)Oxidation"
C)Overheated oil
D)VI (Viscosity Index) depletion from shear"

Question 51

The oil quality sensor operates like a variable capacitor, using oil as the dielectric element measuring alternating current conductivity across the sensor at frequencies between:

A)2 and 5 MHz"
B)6 and 9 MHz"
C)2 and 5 Hz
D)9 and 10 Hz"

Question 52

Which of the following conditions does NOT require the oil to be changed?

A)Coolant leaking into the oil"
B)Defective air filter"
C)Fuel leaking into the oil
D)Engine oil leak"

Question 53

Technician A says that many engines have experienced catastrophic oil-related failures subsequent to seemingly minor repairs when the oil has not been changed. Technician B says that engine oil change intervals may need to be shortened significantly if blends of biodiesel higher than B20 are used. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 54

Technician A says that raw or refined vegetable oils produce the least amount of harm when used in a diesel engine. Technician B says that water in the oil or a mechanical failure that produces internal debris are all circumstances that necessitate an oil change. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 55

The lube oil is supplied under pressure to moving parts through drilled passageways in the engine called oil:

A)galleries"
B)passages"
C)drillings
D)lines"

Question 56

Many new engine designs use flow rate-controlled oil pumps or _______, which operate at either a high-pressure or low-pressure setting, depending on operating requirements.

A)three-stage pumps"
B)two-stage pumps"
C)compound pumps
D)gerotor pumps"

Question 57

A two-stage variable-displacement oil pump is being described. Technician A says that the space between the pump vanes is increased or decreased to change pump output volume. Technician B says that a hydraulic control valve rotates the ring against spring pressure to vary the space swept by the pump vanes. Who is right?

A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question 58

Oil coolers have a(n) ________ for either coolant or oil, which will not allow oil cooling until the engine oil or coolant has reached operating temperature.

A)thermostatically controlled inlet"
B)inlet control valve"
C)ECM shift valve
D)pressure regulator valve"

Question 59

What percentage of the cost of a spin-on filter is in the steel canister and valves?

A)10%"
B)30%"
C)50%
D)80%"

Question 60

What should be done to prevent hot oil from scalding hands when a spin-on filter is removed?

A)Remove it slowly"
B)Remove it quickly"
C)Punch a hole in the bottom
D)Punch a hole in the side"