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Automotive Equipment Ops > ICE > Flashcards

ICE Flashcards

1
Q

What are the four main parts of a 1 cylinder engine

A

Cylinder
Piston
Crankshaft
Connecting rod

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2
Q

What parts of the engine change reciprocating energy to rotary motion

A

Connecting rod and crank shaft

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3
Q

What is top dead center

A

The instant that motion changes from up to down

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4
Q

What happens during the intake stroke

A

Piston moves downward and intake valve opens

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5
Q

When does the compression stroke begin

A

When piston is at BDC with both valves closed

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6
Q

When does the power stroke begin

A

When the piston is at TDC and spark is introduced

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7
Q

What PSI is diesel compression normally

A

500PSI

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8
Q

What angles do V-type engines usually come in

A

45, 50, 55, 60, and 90

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9
Q

What pressure do gas direction injectors operate at

A

Up to 30,000 PSI

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10
Q

What are the 6 types of fuel injection systems

A

Individual pump
Multi plunger
Unit injector
Pressure time injector
Distributor pump
Common rail

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11
Q

What is the job of a fuel injector

A

-Pressurizes
-Meters
-Times
-Atomizes
For a single cylinder

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12
Q

What ways are cam shafts connected to the crank shaft

A

-belt
-Chain
-Gear

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13
Q

How are water pumps driven

A

Normally by belt, but can be gear driven

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14
Q

Which radiator hose is the return hose

A

Upper hose

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15
Q

What connects the radiator to the engine

A

The thermostat

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16
Q

What radiator hose goes to the engine

A

Bottom hose

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17
Q

What does the bottom radiator hose connect together

A

Radiator to the water pump

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18
Q

What are the two types of engine cooling fans

A

Engine powered
Electric

19
Q

What unit is used to grade gasoline

A

Octane

20
Q

What is octane

A

The ability to resist knock or ping

21
Q

What unit is used to grade diesel fuel

A

Cetane

22
Q

What does cetane measure

A

Cold start ability

23
Q

What is the original formula for horse power

A

A horse can lift 330lbs 100ft in 1 minute

24
Q

what is frictional horse power

A

The power needed to over come engine friction

25
Q

How is cylinder size determined

A

By bore diameter and stroke

26
Q

What is the formula for piston displacement

A

Displacement=3.14 x radius squared x stroke

27
Q

Compression ratio formula is

A

BDC volume : TDC volume

28
Q

What is the normal range of diesel compression ratios

A

17:1- 25:1

29
Q

How many piston rings are generally used in a diesel engine

A

4

30
Q

On a 4 stroke engine at what speed does the cam turn

A

1/2 of crank speed

31
Q

What angles are valve seats usually cut

A

30- 45 degrees

32
Q

How big are cam shaft gears

A

Double the size of the crank shaft gear

33
Q

What is the typical clearance for an intake valve

A

.014”

34
Q

What is the typical clearance for an exhaust valve

A

.016”

35
Q

What conditions can a compression test be used to troubleshoot

A

Engine misfire
Rough idle
Puffing noise

36
Q

What can cause low compression

A

Blown head gasket
Engine damage
Burnt valves
Valve train adjustment
Bad timing

37
Q

How much oil is used in a wet compression test

A

1 table spoon of 30w in the cylinder

38
Q

What is does it mean if compression increases during a wet compression test

A

Worn piston rings or bad cylinder

39
Q

What is does it mean if compression stays the same (low) during a wet compression test

A

Valve or head gasket issue

40
Q

What effect does elevation have on vacuum

A

For every 1,000 feet gained pressure increases 1 inch

41
Q

What does 1 horse power equal

A

1hp= 33,000 ft/lb in 1 minute

42
Q

What is brake horse power BHP

A

The power measured at the fly wheel

43
Q

What causes excessive oil consumption

A

External leakage
Burning in the combustion chamber

44
Q

What cause low oil pressure

A

Restricted oil filter
Contaminated fuel
Crank shaft bearing clearance
Cam and rocker bearing clearance
Pump relief valve stuck open
Broken down oil

Automotive Equipment Ops (4 decks)

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