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Engines > Cooling > Flashcards

Cooling Flashcards

1
Q

What happens when oil is too cold?

A

Dilution of oil and sludge build up

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2
Q

What happens when oil is too hot?

A

Pre ignition and oil burnt off cylinder increases cylinder wear

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3
Q

2 types of cooling ?

A

Direct air cooling and liquid cooling

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4
Q

What is dissipation dependant on?

A

Temperature difference between the engine and surrounding air

Surface area

Rate of air flow

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5
Q

What does the fin size depend on?

A

Operating conditions and power output

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6
Q

What is ethylene?

A

Thick hygroscopic liquid with tends to be an anti freeze,

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7
Q

What are inhibitors

A

Chemicals added to suppress the formation of acids and reduce corrosion

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8
Q

What is a hydrometer

A

Test coolant specific gravity

Ratio of water to anti freeze

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9
Q

What is litmus paper for?

A

Testing for acids

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10
Q

Where is the coolant stored ?

A

Radiator

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11
Q

What happens to the coolant when the radiator temperature rises?

A

Coolant rises through thermosythen

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12
Q

In modern cars, what lifts the coolant into the water jacket ?

A

Water pump

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13
Q

What happens when the coolant passes over the water jacket ?

A

Absorbs the heat and transfers it to the radiator

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14
Q

What is the purpose of a cooling system?

A

Cools the engine

Helps it get to operating temperature

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15
Q

What is common when the engine isn’t warm enough?

A

Causes a lot of wear

Produces more pollution

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16
Q

What the purpose of a thermostat?

A

Shorten the warming up period

17
Q

How does the thermostat operate ?

A

Cold- closed

Warm- opens up and let’s coolant through

18
Q

How does the water pump work ?

A

Centrifugal force

19
Q

How is the water pump driven?

A

A pulley

20
Q

Where is ur air cooling most common?

A

Smaller engines

21
Q

What are cooling fins ?

A

They have a larger surface area to allow more heat to be moved away

22
Q

What can irregular fan blade spacing mean?

A

Less noise

23
Q

What are the 2 types of fans?

A

Torque limiting

Air temperature sensing

24
Q

What is a Hidder

A

Provides a coolant supply above the engine

25
Q

What are the 2 types of radiators ?

A

Dow flow and cross flow

26
Q

If the pressure is decreased , the boiling point does what ?

A

Decreases

27
Q

How does the pressure cap operate ?

A

Over indicated pressure (expansion)

Corrected pressure

Drop in pressure (contraction)

28
Q

What is a recovery system for?

A

Maintaining coolant at all times

29
Q

What happens if the pressure in the radiator is too high ?

A

Operates the pressure cap valve and let’s coolant flow into the overflow container . As the pressure drops coolant flows back into the radiator

Engines (10 decks)

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