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SKT Book 3 > B3U3 Lubricating Systems > Flashcards

B3U3 Lubricating Systems Flashcards

1
Q

What is the purpose of lubricating oil in an engine?

A

The oil reduces friction between moving parts. It also helps cool, clean, seal, and prevent corrosion.

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2
Q

What are the characteristics of oil with the grade of SAE 5W–40?

A

It has characteristics of SAE 5W oil during the cold winter months while maintaining the characteristics of SAE 40 during the hot summer months.

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3
Q

How do additives reduce foaming in lubricating oil?

A

They weaken the air bubbles, causing them to pop almost immediately.

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4
Q

What qualities must top quality oil have to prevent corrosion?

A

Adhesiveness, which is the tendency to stick to any surface, and cohesiveness, which is the tendency of the molecules of the oil to stick together.

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5
Q

How does oil pass through an external gear type pump?

A

The pump draws oil into the rotating gear teeth and carries it next to the outside housing.

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6
Q

What is the purpose of the pressure relief valve on an oil pump?

A

It prevents excess pressure from building up in the lubrication system by providing a bypass back to the oil sump when the pressure increases above the maximum level.

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7
Q

Describe the counterflow principle.

A

The oil and coolant flow in opposite directions to aid cooling.

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8
Q

What is the purpose of crankcase ventilation?

A

It allows any pressure building up in the crankcase to escape.

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9
Q

Where does oil move to once it becomes pressurized?

A

It flows through the oil cooler.

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10
Q

Where does the cool, clean oil move to when it leaves the filter?

A

It passes into the main oil gallery.

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11
Q

What are the two ways oil reaches the valve train?

A

(1) It uses oil galleries in the cylinder block and head or

(2) Passes through hollow push rods and sprays onto the valve train components.

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12
Q

What are the two types of lubricating oil protective devices?

A

(1) An oil pressure gauge.

(2) An oil shutdown switch.

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13
Q

What contaminates does the oil filter typically not remove from the oil?

A

Carbon and soot because they are oil based.

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14
Q

Why do you operate the engine and allow it to get to operating temperature before you drain the oil?

A

To allow the heavy particles in the oil that has had the time to settle to the bottom of the oil sump to be suspended in the oil and liquefies waxy deposits to allow the oil to remove them from the engine.

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15
Q

What is the main idea of flushing the lubricating system?

A

To clean all of the deposits out of the engine.

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16
Q

What do you do before installing a new spin-on oil filter?

A

Fill with new oil

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17
Q

How much do you turn a spin-on oil filter once it makes contact with the filter head?

A

One-fourth a turn

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18
Q

What must you do if you use the drain to collect your oil sample for an oil test?

A

Drain enough oil into a pan to remove this stagnate oil so your sample is from the engine sump

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19
Q

In a solid contaminate test, how long do you allow the drop of oil to penetrate the blotter paper?

A

To 10 minutes or when it is no longer shiny or wet.

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20
Q

In a reaction test, for how long do you vigorously shake the vial?

A

20 seconds

21
Q

In a dilution test, what is indicated if the engine oil flows out faster than the test sample?

A

The engine oil is diluted beyond five percent.

22
Q

How does the SOAP test help you determine internal problems in an engine before they become serious?

A

By identifying different metal particles and their concentration in the oil.

23
Q

Why is it a good idea to leave the four corner bolts for last to support the oil pan until prior to removal?

A

Letting it sag on one side could cause it to warp, making it difficult, if not impossible to seal when you replace it.

24
Q

What must you do before replacing the sending unit if it has two or more wires?

A

Tag them so you can reinstall them correctly.

25
Q

What are possible corrective actions for external leaks?

A

(1) Oil lines or connections leaking.
(2) Gasket or oil seal leaking.
(3) High crankcase pressure.
(4) Excessive oil in air box (two-stroke engines

26
Q

What is the possible cause if an engine has excessive crankcase pressure?

A

cylinder blow by

27
Q

What would poor oil circulation cause?

A

Low lubricating oil pressure

28
Q

What condition would cause high oil consumption?

A

(1) Internal leaks.
(2) External leaks
(3) Oil control at cylinder

29
Q

How does oil with high viscosity flow and pour?

a. Readily.
b. Quickly.
c. Effortlessly.
d. In a sluggish manner.

A

D. In a sluggish manner

30
Q

Which characteristic does oil with the grade of Society of Automotive Engineers (SAE) 5W–40 contain during cold winter months?

a. SAE 5W.
b. SAE 20W.
c. SAE 40.
d. SAE 45.

A

A. SAE 5W

31
Q

When we apply heavy loads to oil what is the ability of a thin layer of oil to hold together called?

a. Film strength.
b. Detergency.
c. Pour point.
d. Viscosity.

A

A. Film Strength

32
Q

Against what does the protective film of oil seal the internal engine parts when trying to protect the engine parts from corrosion?

a. Fuel in the oil.
b. Coolant in the crankcase.
c. Oxygen and moisture in the air.
d. Condensation in the combustion chamber.

A

C. Oxygen and moisture in the air.

33
Q

Where is the relief valve located in the lubrication system?

a. Input side of the strainer.
b. Output side of the oil filter.
c. Input side of the oil gallery.
d. Output side of the oil pump.

A

D. Output side of the oil pump

34
Q

Identify the term that describes how oil and coolant flow in opposite directions to aid cooling.

a. Crisscross principle.
b. Counter flow principle.
c. Directional flow theory.
d. Opposite movement theory

A

B. Counter flow principle

35
Q

Which oil pressure gauge uses direct pressure on the gauge to indicate the pressure?

a. Electrical.
b. Hydraulic.
c. Pnuematic.
d. Mechanical.

A

D. Mechanical

36
Q

Identify a protective device that shuts the engine down if oil pressure gets low.

a. Oil pressure switch.
b. Oil temperature switch.
c. Oil pressure sending unit.
d. Oil temperature sending unit.

A

A. Oil pressure switch

37
Q

Which component does oil pass through to flow to the piston pin and piston?

a. Camshaft.
b. Push rods.
c. Cylinder head.
d. Connecting rod.

A

D. Connecting rod.

38
Q

What is one way oil is transported to the valve train components?

a. Connecting rods.
b. Hollow push rods.
c. Camshaft passages.
d. Crankshaft passages.

A

B Hollow push rods.

39
Q

Which type of oil or coolant levels can reduce the cooling capacity of the oil storage system?

a. Low oil.
b. High oil.
c. Low coolant.
d. High coolant.

A

A. Low oil

40
Q

Which component collects most contaminates in the lubricating oil?

a. Oil filter.
b. Oil cooler.
c. Oil strainer.
d. Relief valve.

A

A. Oil Filter

41
Q

You are adding new oil into the system; before you close the drain to push the old oil remaining in the bottom of the sump out, when do you close the drain?

a. After you add a quart of oil.
b. After oil begins to pour out of the drain again.
c. Once you can begin to see some of the new oil.
d. Once the oil pouring out of the drain becomes clear.

A

D. Once the oil pouring out of the drain becomes clear.

42
Q

The type of oil filter you would use a strap wrench in order to loosen the filter body is the

a. spin on filters.
b. clamp-on filters.
c. top mount cartridges.
d. bottom mounted cartridges.

A

A. Spin on filters

43
Q

In addition to sulfur what other substance from the fuel may get into the engine oil and form sulfuric acid?

a. Sodium from the cooling system.
b. Nitrogen from the lubricating system.
c. Air from the intake or exhaust system.
d. Water from the cooling system or condensation.

A

D. Water form the cooling system or condensation.

44
Q

What is the dilution level of fuel of the test sample you create by adding fuel to a sample of new oil?

a. 1 percent.
b. 3 percent.
c. 5 percent.
d. 10 percent.

A

C. 5 percent

45
Q

Which oil testing method uses a computer analysis process that provides you with a detailed look at the engine oil?

a. Field Lubricating Oil Test (FLOT).
b. Systematic Contaminate Oil Test (SCOT).
c. Spectrometric Oil Analysis Program (SOAP). d. Lubricating Oil Graphic Observation (LOGO).

A

C. spectrometric oil analysis program (SOAP)

46
Q

Where must you document oil test results?

a. Inspection Checklist for the Generator Operating Log and AF IMT 719.
b. Inspection Checklist for the Generator Operating Log only.
c. Appropriate MAJCOM approved form.
d. AF IMT 719 only.

A

A. Inspection checklist for the generator operating log and AF IMT 719

47
Q

What is your first step in removing the oil cooler from the engine?

a. Drain the coolant.
b. Drain the lubricating oil.
c. Remove the turbocharger.
d. Remove the exhaust manifold.

A

A. Drain the coolant.

48
Q

What is a possible cause of excessive crankcase pressure?

a. Poor circulation of oil.
b. Cylinder blow by.
c. Worn oil pump.
d. Internal oil leak.

A

B. Cylinder blow by

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