Chapter 33

Question 1

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

Answer 1

2 revolutions

Question 2

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

Answer 2

The valve overlap increases.

Question 3

Which timing chain type is also called a silent chain

Answer 3

Morse and flatlink.

Question 4

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

Answer 4

True

Question 5

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

Answer 5

True

Question 6

Many technicians always use new push rods because.

Answer 6

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

Question 7

A DOHC v 6 as how many cam shafts.

Answer 7

2

Question 8

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.

Answer 8

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

Question 9

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

Answer 9

The valve lash is too loose.

Question 10

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

Answer 10

The wrong sae rated engine oil is used.

Question 11

A hypereutectic piston

Answer 11

uses about 16% silicon

Question 12

many aluminum pistons skirts are plated with

Answer 12

tin or moly graphite

Question 13

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

Answer 13

provide increased strength, control thermal expansion

Question 14

Full-floating piston pins are retained by.

Answer 14

lock rings

Question 15

the space behind the ring is called

Answer 15

back clearance

Question 16

A misaligned connecting rod causes what type of engine wear.

Answer 16

Diagonal where on the piston skirt?

Question 17

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

Answer 17

piston ring and piston ring groove

Question 18

piston ring gap should only be measured after

Answer 18

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

Question 19

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

Answer 19

interference fit

Question 20

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.

Answer 20

15 degrees retard to 25 degrees advance.

Question 21

Cam lobe height can be measured using.

Answer 21

Dial indicator

Question 22

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

Answer 22

0.002 inch

Question 23

A different push rod length is necessary if

Answer 23

The block deck is machined.

Question 24

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

Answer 24

Straightness?

Question 25

The rocker arm ratio is usually maintained at

Answer 25

1.5.1

Question 26

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

Answer 26

Pistons

Question 27

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

Answer 27

Reduce noise

Question 28

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

Answer 28

42 to 60

Question 29

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

Answer 29

2

Question 30

Which of the following is true of cam shaft operation?

Answer 30

The camshaft lobe changes rotary motion to linear motion.

Question 31

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

Answer 31

A rocker arm reduces the travel of the cam follower.

Question 32

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.

Answer 32

30 degrees overlap.

Question 33

Which of the following is true of cam timing specifications?

Answer 33

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

Question 34

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

Answer 34

True

Question 35

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

Answer 35

True

Question 36

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

Answer 36

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

Question 37

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

Answer 37

False

Question 38

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

Answer 38

True

Question 39

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

Answer 39

2

Question 40

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

Answer 40

180

Question 41

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

Answer 41

Silicon

Question 42

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

Answer 42

Scuffing

Question 43

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.

Answer 43

double knock

Question 44

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

Answer 44

Free wheeling?

Question 45

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

Answer 45

A double knock.

Question 46

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

Answer 46

Reverse twist ring

Question 47

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

Answer 47

Molybdenum

Question 48

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.

Answer 48

30 to 50 tons.

Question 49

What is the maximum acceptable twist in a connecting rod?

Answer 49

0.002

Question 50

Which of the following is true of pistons?

Answer 50

This slots in the piston head help reduce skirt expansion.

Question 51

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

Answer 51

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

Question 52

Which of the following is true a piston pin offset

Answer 52

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.

Question 53

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

Answer 53

False

Question 54

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

Answer 54

True

Question 55

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

Answer 55

True

Question 56

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

Answer 56

True

Question 57

Connecting rods can be manufactured by centered metal processes

Answer 57

True

Question 58

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.

Answer 58

True

Question 59

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.

Answer 59

True

Question 60

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

Answer 60

False.

Question 61

DOHC v 6 is how many camshafts?

Answer 61

4

Question 62

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

Answer 62

60 to 90 psi.

Question 63

Engine oil passages and engine block are called

Answer 63

Galleries

Question 64

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

Answer 64

True

Question 65

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

Answer 65

True

Question 66

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

Answer 66

True

Question 67

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

Answer 67

valve train components.