Question 1

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Accepted Answer

A black, oily buildup in the neck and stem area indicates that oil is entering the cylinder through the intake valve.

Question 2

Technician A says positive valve stem seals fit loosely around the top of the stem. Technician B says positive stem seals scrape oil off the valve as it moves up and down. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor B

Question 3

Technician A says the end of the valve spring that is wound the tightest should face toward the spring retainer. Technician B says the O-ring seal should be installed in the lowest of the keeper grooves on the valve stem.

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor B

Question 4

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Accepted Answer

A) True 
 B)False

Question 5

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Accepted Answer

A) True 
 B)False

Question 6

In response to temperature changes, aluminum expands and contracts almost twice as much as cast iron.

Accepted Answer

A) True 
 B)False

Question 7

Technician A says VVT (variable valve timing) engines use a cam phaser that advances or retards the camshaft as the engine is running. Technician B says VVT engines use a third cam lobe with increased lift and duration, operating a third rocker arm that is coupled to the two primary rocker arms by a hydraulically controlled pin, while the engine is running. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor B

Question 8

_____type valve stem seals move up and down with the valve stems to deflect oil away from the guides.

Accepted Answer

A)  Positive
B)  Umbrella
C)  O-ring
D)  Lip

Question 9

The distance between the valve face and the head of the valve is called the ____________________.

Accepted Answer

The answer of The distance between the valve face and...

Question 10

Installed valve spring height can be adjusted with ____________________.

Accepted Answer

The answer of Installed valve spring height can be adjusted...

Question 11

Resurfacing the cylinder head can affect _____.

Accepted Answer

A)  compression ratio
B)  valve timing
C)  piston to valve clearance
D)  All the answers are correct.

Question 12

The hemispherical combustion chamber provides excellent turbulence to the air and fuel mixture.

Accepted Answer

A) True 
 B)False

Question 13

Sodium-filled valves should be cut open for inspection.

Accepted Answer

A) True 
 B)False

Question 14

A single hole in the cylinder head that divides into two branches is called a _____ port.

Accepted Answer

A)  dual
B)  siamese
C)  combination
D)  two-stage

Question 15

To protect against scuffing and wear, some valves have coatings of black nitride applied to the valve stem.

Accepted Answer

A) True 
 B)False  True

Question 16

Technician A resurfaces valve seats using a grinding stone. Technician B resurfaces valve seats using a cutting blade. Who is correct?

Accepted Answer

A)  A only
B)  B only
C)  both A and B
D)  neither A nor B

Question 17

Stainless steel is nonmagnetic.

Accepted Answer

A) True 
 B)False

Question 18

What happens when valve spring tension is too low?

Accepted Answer

Insufficient spring tension can lead to valve bounce and breakage.

Question 19

____________________ support the valve in the head and prevent the valve from moving in any direction other than up and down.

Accepted Answer

The answer of ____________________ support the valve in the head...

Question 20

Prussian blue or machinist dye is used to ______.

Accepted Answer

A)  measure stem-to-guide clearance
B)  measure valve runout
C)  mark the position of cam bearings prior to removal
D)  check the width and position of the valve-to-seat contact pattern

Exam 12: Upper-End Theory and Service

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Correct Answer
verified
A black, oily buildup in the neck and stem area indicates that oil is entering the cylinder through the intake valve.

Technician A says positive valve stem seals fit loosely around the top of the stem. Technician B says positive stem seals scrape oil off the valve as it moves up and down. Who is correct?

Correct Answer
verified

Technician A says the end of the valve spring that is wound the tightest should face toward the spring retainer. Technician B says the O-ring seal should be installed in the lowest of the keeper grooves on the valve stem.

Correct Answer
verified

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Correct Answer
verified

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Correct Answer
verified

In response to temperature changes, aluminum expands and contracts almost twice as much as cast iron.

Correct Answer
verified

Correct Answer
verified

_____type valve stem seals move up and down with the valve stems to deflect oil away from the guides.

Correct Answer
verified

The distance between the valve face and the head of the valve is called the ____________________.

Correct Answer
verified

Installed valve spring height can be adjusted with ____________________.

Correct Answer
verified

Resurfacing the cylinder head can affect _____.

Correct Answer
verified

The hemispherical combustion chamber provides excellent turbulence to the air and fuel mixture.

Correct Answer
verified

Sodium-filled valves should be cut open for inspection.

Correct Answer
verified

A single hole in the cylinder head that divides into two branches is called a _____ port.

Correct Answer
verified

To protect against scuffing and wear, some valves have coatings of black nitride applied to the valve stem.

Correct Answer
verified
True

Technician A resurfaces valve seats using a grinding stone. Technician B resurfaces valve seats using a cutting blade. Who is correct?

Correct Answer
verified

Stainless steel is nonmagnetic.

Correct Answer
verified

What happens when valve spring tension is too low?

Correct Answer
verified
Insufficient spring tension can lead to valve bounce and breakage.

____________________ support the valve in the head and prevent the valve from moving in any direction other than up and down.

Correct Answer
verified

Prussian blue or machinist dye is used to ______.

Correct Answer
verified

Exam 12: Upper-End Theory and Service

While disassembling a cylinder head, what would indicate that the valve seals are worn or damaged?

Correct AnswerverifiedA black, oily buildup in the neck and stem area indicates that oil is entering the cylinder through the intake valve.

Technician A says positive valve stem seals fit loosely around the top of the stem. Technician B says positive stem seals scrape oil off the valve as it moves up and down. Who is correct?

Correct AnswerverifiedShow Answer

Technician A says the end of the valve spring that is wound the tightest should face toward the spring retainer. Technician B says the O-ring seal should be installed in the lowest of the keeper grooves on the valve stem.

Correct AnswerverifiedShow Answer

Aluminum cylinder head bolts should never be loosened or tightened when the metal is hot.

Correct AnswerverifiedShow Answer

Aluminum cylinder heads weigh roughly half as much as cast-iron heads.

Correct AnswerverifiedShow Answer

In response to temperature changes, aluminum expands and contracts almost twice as much as cast iron.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

_____type valve stem seals move up and down with the valve stems to deflect oil away from the guides.

Correct AnswerverifiedShow Answer

The distance between the valve face and the head of the valve is called the ____________________.

Correct AnswerverifiedShow Answer

Installed valve spring height can be adjusted with ____________________.

Correct AnswerverifiedShow Answer

Resurfacing the cylinder head can affect _____.

Correct AnswerverifiedShow Answer

The hemispherical combustion chamber provides excellent turbulence to the air and fuel mixture.

Correct AnswerverifiedShow Answer

Sodium-filled valves should be cut open for inspection.

Correct AnswerverifiedShow Answer

A single hole in the cylinder head that divides into two branches is called a _____ port.

Correct AnswerverifiedShow Answer

To protect against scuffing and wear, some valves have coatings of black nitride applied to the valve stem.

Correct AnswerverifiedTrue

Technician A resurfaces valve seats using a grinding stone. Technician B resurfaces valve seats using a cutting blade. Who is correct?

Correct AnswerverifiedShow Answer

Stainless steel is nonmagnetic.

Correct AnswerverifiedShow Answer

What happens when valve spring tension is too low?

Correct AnswerverifiedInsufficient spring tension can lead to valve bounce and breakage.

____________________ support the valve in the head and prevent the valve from moving in any direction other than up and down.

Correct AnswerverifiedShow Answer

Prussian blue or machinist dye is used to ______.

Correct AnswerverifiedShow Answer

Correct Answer
verified
A black, oily buildup in the neck and stem area indicates that oil is entering the cylinder through the intake valve.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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True

Correct Answer
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Correct Answer
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Correct Answer
verified
Insufficient spring tension can lead to valve bounce and breakage.

Correct Answer
verified

Correct Answer
verified