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Midterm > Chapter 33 > Flashcards

Chapter 33 Flashcards

1
Q

The cam shaft makes blank for every revolution of the crankshaft.

A

2 revolutions

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2
Q

It flipped and duration remained constant and the lobe center angle decreases then blank.

A

The valve overlap increases.

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3
Q

Which timing chain type is also called a silent chain

A

Morse and flatlink.

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4
Q

Technician a says that changing the exhaust valve timing helps reduce exhaust emissions.

A

True

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5
Q

Technician b says the changing the intake valve timing helps increase low speed torque.

A

True

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6
Q

Many technicians always use new push rods because.

A

All the dirt cannot be cleaned out from the hollow center.

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7
Q

A DOHC v 6 as how many cam shafts.

A

2

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8
Q

Intake valve opens at 39 degrees btdc and closes at 71 degrees aBDC so valve opens as 78 degrees. BBdc. And closes at 47 degrees atDC.

A

Intake valve duration a 110 degrees. The exhaust valve duration is a 125 degrees.

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9
Q

hydraulic valve lifters can make a ticking noise when the engine is running if.

A

The valve lash is too loose.

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10
Q

Hydraulic valve lifters or hydraulic lash adjusters may bleed down properly and cause an engine. Miss

A

The wrong sae rated engine oil is used.

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11
Q

A hypereutectic piston

A

uses about 16% silicon

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12
Q

many aluminum pistons skirts are plated with

A

tin or moly graphite

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13
Q

The purpose of casting steel struts into an aluminum piston is to.

A

provide increased strength, control thermal expansion

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14
Q

Full-floating piston pins are retained by.

A

lock rings

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15
Q

the space behind the ring is called

A

back clearance

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16
Q

A misaligned connecting rod causes what type of engine wear.

A

Diagonal where on the piston skirt?

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17
Q

Side clearance is a measure taken between the blank and the blank.

A

piston ring and piston ring groove

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18
Q

piston ring gap should only be measured after

A

all cylinder work had been performed and installing the rings on the piston

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19
Q

Which type of connecting rod needs to be heated to install the piston pin?

A

interference fit

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20
Q

The veritable valve timing system uses an electronically control hydraulic gear driven cam phaser that can alter the relationship of the camshaft from blank relative to the crank shaft.

A

15 degrees retard to 25 degrees advance.

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21
Q

Cam lobe height can be measured using.

A

Dial indicator

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22
Q

The maximum total indicator runout (TIR) the cam shaft should be less than.

A

0.002 inch

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23
Q

A different push rod length is necessary if

A

The block deck is machined.

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24
Q

All push rods should be rolled on a flat service to check for.

A

Straightness?

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25
Q

The rocker arm ratio is usually maintained at

A

1.5.1

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26
Q

All the following can be used by the crankshaft to drive the camshaft except

A

Pistons

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27
Q

The teeth of the gears used on the camshaft are made from a soft material to.

A

Reduce noise

28
Q

Typical camshaft hardness should be blank to the Rockwell c scale.

A

42 to 60

29
Q

The gear or sprocket on the camshaft has blank times as many teeth or notches as the one on the crank shaft.

A

2

30
Q

Which of the following is true of cam shaft operation?

A

The camshaft lobe changes rotary motion to linear motion.

31
Q

Which of the following is true of the functioning of rocker arms and engines?

A

A rocker arm reduces the travel of the cam follower.

32
Q

In the engine features a cam shaft where the intake valve starts to open at 10 degrees before top dead center and the exhaust valve is open until twin grees after time dead center.

A

30 degrees overlap.

33
Q

Which of the following is true of cam timing specifications?

A

The exhaust one opens while the piston is traveling down on the power stroke.

34
Q

Tennison. A stated that lower amount of overlap we results in a smoother, idle and low engine speed operation.

A

True

35
Q

technician b says that a lower amount of overlap results in a lower amount of power at higher engine speeds.

A

True

36
Q

Which of the following is true of valve train problem diagnosis.

A

In an overhead valve engine, easy visual inspection is not possible.

37
Q

Technician a stated that aeration is caused by an oil pressure?

A

False

38
Q

Bob stated that aeration is caused by the oil level being too low?

A

True

39
Q

The piston starts, accelerate, and stops blank in each crankshaft revolution.

A

2

40
Q

The piston stops at the bottom of the cylinder at blank degrees of the crankshaft rotation.

A

180

41
Q

A standard cast aluminum piston contains 9 percent to 12 percent blank and it is called a eutectic piston

A

Silicon

42
Q

The condition where the metal of the piston actually contacts the cylinder wall is called.

A

Scuffing

43
Q

If the person pen is loose in the piston or in the connecting rod, it will make a sound like the engine is running. this is known as a.

A

double knock

44
Q

When an engine is designed not to have the piston hitting the valves, the timing chain or belt the engines is said to be.

A

Free wheeling?

45
Q

If the piston pin is loose in the piston or in the connecting rod, it will make a sound while the engine is running.

A

A double knock.

46
Q

Which of the following types of piston rings is most likely produced by chamfering the rings lower inner corner.

A

Reverse twist ring

47
Q

The plasma method is a spray method used to deposit blank on cast iron to produce a long, wearing and low friction piston ring.

A

Molybdenum

48
Q

During the manufacture a powdered middle connecting rod, the metal powder is placed in a die and compacted under a pressure of blank tons per square inch.

A

30 to 50 tons.

49
Q

What is the maximum acceptable twist in a connecting rod?

A

0.002

50
Q

Which of the following is true of pistons?

A

This slots in the piston head help reduce skirt expansion.

51
Q

Which of the following is true of the characteristics of pistons?

A

Forged pistons have a dense grain structure and are very strong.

52
Q

Which of the following is true a piston pin offset

A

Pin offset is designed to reduce piston slap and noise that can result as the large and of connecting rod crosses over top dead center.

53
Q

Bob stated that in a inference fit the connecting rod hole is made slightly larger than the piston pin

A

False

54
Q

Ben stated in that the pin is installed by heating the rod to expand the hole or by pressing the pin into the rod.

A

True

55
Q

At low speeds the gases have more time to leak through the ring gap

A

True

56
Q

When a chamfer Is made in the upper inside corner of the piston ring the ring cross section is unbalance

A

True

57
Q

Connecting rods can be manufactured by centered metal processes

A

True

58
Q

After the block and cylinder bores have been reconditioned, the piston should be inverted and the ring should be placed into the lower quarter of the cylinder.

A

True

59
Q

Bob stated that as the piston goes rapidly up and down in a cylinder it tosses the rings to the top and to the bottom of the ring grooves.

A

True

60
Q

Ben stated that the pounding of each ring in his group gradually decreases the piston ring clearance

A

False.

61
Q

DOHC v 6 is how many camshafts?

A

4

62
Q

A good engine should produce how much compression during a running dynamic compression test at idol.

A

60 to 90 psi.

63
Q

Engine oil passages and engine block are called

A

Galleries

64
Q

Bob says that changing the exhaust valve timing helps reduce exhaust emission.

A

True

65
Q

Ben says that greyish white stain on the engine could be a coolant leak

A

True

66
Q

Ben says they are changing the intake valve timing helps increase low speed torque.

A

True

67
Q

In typical engine lubrication, systems what components are last to receive oil and the first to suffer from lack of oil oil pressure.

A

valve train components.

Midterm (16 decks)

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