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HET2 > 202C - Lubrication & Crankcase Ventilation > Flashcards

202C - Lubrication & Crankcase Ventilation Flashcards

1
Q

Good quality oil will serve what four main functions?

A
  • Reduce wear & friction
  • Clean
  • Absorb heat
  • Act as a sealant

202C pg. 2

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2
Q

What is viscosity a measure of?

A

Resistance to flow.

202C pg. 3

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3
Q

What does the viscosity index (VI) refer to?

A

The rate that oils will change viscosity as the temperature changes.

A small change in viscosity through various temperatures is a high VI.

202C pg. 5

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4
Q

What term describes the rate that oil viscosity changes with temperature?

A

Viscosity Index (VI)
Low VI = High viscosity change
High VI = Low viscosity change

202C pg. 5

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5
Q

What is oil pour point?

A

The lowest temperature at which the oil will flow.

202C pg. 6

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6
Q

Would 5W30 or 0W30 oil have a lower pour point and be better suited for colder temperature usage?

A

0W30
Pour point of -48C

202C pg. 6

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7
Q

What are detergents designed to do as part of an oil additive?

A

Prevent deposits from forming on internal engine parts by keeping particles in suspension.

202C pg. 7

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8
Q

What are dispersants designed to do as part of an oil additive?

A

Keep deposits suspended in the oil.

202C pg. 7

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9
Q

What do the two types of oil classifications SI and CI represent?

A

SI - Spark Ignition
CI - Compression Ignition

202C pg. 8

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10
Q

The majority of bearing failures can be traced to _______ caused by ______.

A

Traced to oil contamination
Caused by dirt in the lubricant

202C pg. 10

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11
Q

How should the oil sample be taken?

A
  • When the oil is hot and wear particles are still in suspension
  • Mid-stream

202C pg. 13

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12
Q

An oil analysis serves what two main purposes?

A
  • Determines the suitability of the oil
  • Determine if there are any existing engine problems

202C pg. 14

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13
Q

The engine crankcase is used to _____ and ______ the supply of lubricating oil.

A
  • Store
  • Cool

202C pg. 21

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14
Q

What materials are engine oil pans typically constructed of?

A
  • Steel sheet metal
  • Aluminum

202C pg. 22

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15
Q

The two most common designs of engine oil pumps are:

A
  • External gear type
  • Rotor style

202C pg. 25

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16
Q

What maintains the system oil pressure within normal operating limits?

A

Oil pressure regulating valve

202C pg. 27

17
Q

What is used to protect the engine from excess oil pressure?

A

Oil pressure relief valves

202C pg. 28

18
Q

If both an oil pressure regulating valve and relief valve are used, which valve will have the higher pressure setting?

A

Relief valve will have the higher pressure setting.

202C pg. 28

19
Q

What are the two main types of oil coolers?

A
  • Oil to air
  • Oil to coolant

Used to reduce chance of oil oxidation and breakdown.

202C pg. 29

20
Q

What is the purpose of the oil bypass filter?

A
  • Receives 5% - 10% of the engine’s oil to filter and return to oil pan
  • Used strictly as a cleaning device
  • May trap particles down to 10 microns

There is no bypass valve in a bypass filter.

202C pg. 31

21
Q

What is the purpose of the full-flow oil filter?

A
  • Filters all the oil for engine lubrication
  • Filters between 25-60 microns
  • Has a bypass valve

202C pg. 32

22
Q

When the bypass valve is open, the full-flow oil filter becomes a _____, delivering both filtered and unfiltered oil.

A

Shunt type oil filter

202C pg. 32

23
Q

What is the main purpose of the crankcase ventilation system?

A

Removes combustion gases and water vapours from the crankcase.

If blow-by gases were to remain in the crankcase, the chance of forming sulphuric acid in the oil increases.

202C pg. 35

24
Q

What will form in the engine if the engine rarely warms up sufficiently to transmit water vapours to the crankcase ventilation system?

A

Sludge will form

202C pg. 36

25
Q

When were crankcase vents restricted from being vented to the atmosphere?

A

After the 2007 build year, starting in the 2008 build year.

202C pg. 37

26
Q

Oil filters are typically rotated how many turns after the sealing ring contacts the filter housing?

A

1/2 to 3/4 of a turn

202C pg. 41

27
Q

Who established the oil classification standards?

A

American Petroleum Institute (API)

202c pg. 8

28
Q

Who is responsible for the viscosity rating of motor oil?

A

Society of Automotive Engineers (SAE)

202c pg. 4

29
Q

When the bypass valve in an oil filter is open, the full-flow filter becomes what is called a _______ type oil filter and delivers both filtered & unfiltered oil to the engine.

A

Shunt

202c pg. 32

HET2 (29 decks)

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