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Agri Tech 25 > Engines > Flashcards

Engines Flashcards

1
Q

What is the firing order on a 4 cylinder engine

A

1342

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2
Q

What is the firing order on a 6 cylinder

A

153264

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3
Q

What it the ideal fuel to air ratio of a diesel engine

A

14.7 : 1 by mass

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4
Q

How is a glow plug controlled

A

Timer and relay

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5
Q

How to test a glow plug

A

Using a multimeter aim for 1 to 5 ohms of resistance

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6
Q

What does a charge air cooler do

A

Increases the density of the intake by cooling the temperature

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7
Q

How to time a fuel pump

A

Using a dti

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8
Q

What does ci and si stand for

A

Compression ignition and spark ignition

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9
Q

What is thermal efficacy

A

The amount of heat which is used for useful work

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10
Q

Volumetric efficacy

A

The amount of time it takes to fill a cylinder

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11
Q

What is mechanical efficacy

A

A way to measure the effectiveness of a systems performance

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12
Q

What does ohv and ohc stand for

A

Overhead valve (pushrod) and overhead cam (car)

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13
Q

If the crankshaft rotates once how many times does the camshaft rotate

A

Half a turn.

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14
Q

What is the difference between indirect and direct fuel injection

A

Direct injection is premixed air and fuel and indirect uses a mixing chamber above the combustion chamber to fix the 2 before injection

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15
Q

What is the face of a block called

A

The deck

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16
Q

Why are cylinder walls hatched

A

To allow an oil film to stick onto them improving lubrication

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17
Q

How do you fit piston rings

A

120 degrees apart and follow manufacturer guidelines

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18
Q

Name the piston parts

A

Crown. 3 rings 2 compression one scraper. The skirt, gudion pin, con rod, big end cap

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19
Q

What measument is a dyno in

A

Kilawatt

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20
Q

What is the 4 stroke cycle

A

Intake, compression, power, exaust

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21
Q

What are major and minor forces

A

It is the faces where the piston slaps against causing ovality

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22
Q

What is the purpose of a multi cylinder engine

A

To allow balance and efficiency

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23
Q

What is swept volume

A

Top dead centre to bottom

24
Q

What is clearance volume

A

It is tdc to block

25
Q

Total volume is

A

Clearance and swept volume

26
Q

What is compression ratio

A

It is total % clearance volume

27
Q

How do you work out cubic capacity

A

Top to bottom and times by the amount of cylinders

28
Q

What is thermal conductivity

A

The rate of which an object conducts heat

29
Q

What is thermal expansion

A

The rate of which an object expands when heated

30
Q

What are the 3 types of heat transfer

A

Conduction, convection and radiation

31
Q

What is coolguard

A

Ethylene glycol

32
Q

What is the benefit of coolguard pg

A

Propylene glycol it is less toxic

33
Q

Hydrometer measurements for good coolant

A

Water = 1g cm
coolant = 1.11 g cm

34
Q

What is a refractometer

A

It is a device which reflects light allowing it to determine the coolant strength

35
Q

What does miscible mean

A

When 2 fluids form a mixture of

36
Q

What valve is bigger

A

The intake valve is slightly larger to increase volumetric efficacy

37
Q

What is blow by

A

It is the piston carrying unburnt, corrosive gassed and steam into the crankcase

38
Q

What is basic lubrication

A

Splash and mist

39
Q

What is boundary lubrication

A

Required for sliding engine components that don’t need a pressure feed

40
Q

What is hydrodynamic lubrication

A

It is where an oil needs pressurising to be entered like a main crank bearing needs this high pressure in order to keep an oil film

41
Q

What is hydrodynamic lubrication

A

It is where an oil needs pressurising to be entered like a main crank bearing needs this high pressure in order to keep an oil film

42
Q

During an engine cylinder shutdown test it reported that cylinder 3 revealed a 25 percent drop what could this mean

A

This cylinder is completely fine due to the drop

43
Q

How is crankshaft end float adjusted

A

Using thrust bearing/ shims

44
Q

What is plastiguage used for

A

To check bearing clearance

45
Q

How should you install piston rings

A

Away from minor and major force face
And 120 degrees apart

46
Q

What will a turbo inter cooler do

A

Decrease air temp and increase air density

47
Q

As the engine increases heat what will happen to the valve clearances

A

They will get closer/ smaller tolerance

48
Q

What does octane rating refer too

A

Fuels auto ignition point for petrol/ fuel

49
Q

An engine is burning excessive oil what could be a cause

A

Stem seals

50
Q

What do hydraulic cam lifters do

A

Self adjust allowing it to have less maintenance

51
Q

How do you know what way up a piston ring goes

A

Manufacturer marking

52
Q

How do you measure bore ovality

A

Using a borescope and you take reading from 3 different points

53
Q

What is multipoint injection

A

It is an electronic injection system

54
Q

What does common rail refer too

A

All injectors are fed by one ‘common rail’

55
Q

How could a con rod become bend 3 reasons

A

Hydrlock due to excessive fuel
Hydrolock from water in exhaust
Incorrect valve timing

56
Q

This machine cranks but no Vapor is coming out of exaust and it won’t start what should you do

A

Check fuel level / emergency tap
Check fuel filters
Ask customer what happened
Check service advisor

Agri Tech 25 (18 decks)

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