Question 1

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 2

What happens when valve spring tension is too low?

Accepted Answer

Insufficient spring tension can lead to valve bounce and breakage.

Question 3

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 4

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 5

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

Accepted Answer

A) True 
 B)False

Question 6

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 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 9

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 10

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 11

_____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 12

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

Question 13

Sodium-filled valves should be cut open for inspection.

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Stainless steel is nonmagnetic.

Accepted Answer

A) True 
 B)False

Question 17

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 18

Installed valve spring height can be adjusted with ____________________.

Accepted Answer

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

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

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

Exam 12: Upper-End Theory and Service

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

What happens when valve spring tension is too low?

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

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

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.

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

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

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?

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

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

Prussian blue or machinist dye is used to ______.

Sodium-filled valves should be cut open for inspection.

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

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

Stainless steel is nonmagnetic.

Resurfacing the cylinder head can affect _____.

Installed valve spring height can be adjusted with ____________________.

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

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