Question 1

If an interference angle is machined on a valve or seat, the angle is usually ________.

Accepted Answer

A)  1-3 degree
B)  0.5-0.75 degree
C)  0.005 degree
D)  1 degreeE) C) and D)
F) B) and D)

Question 2

Which of these components is the valve seal?

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) A) and C)
F) All of the above

Question 3

Technician A says that the exhaust valve is larger than the intake valve to ensure that all the exhaust gases leave the cylinder. Technician B says that the exhaust valve is larger than the intake valve to ensure proper heat dissipation. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) C) and D)
F) A) and B)

Question 4

Installed height is the distance between the valve spring ________ and the underside of the valve spring retainer.

Accepted Answer

A)  Seat
B)  Edges
C)  Keepers
D)  CoilsE) A) and D)
F) All of the above

Question 5

Technician A says that all valves rotate to help prevent the valves and seats from burning. Technician B says that positive type valve rotators are only used on intake valves. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) All of the above
F) B) and C) D

Question 6

In a normally operating engine, intake and exhaust valves are opened by a cam and closed by ________.

Accepted Answer

A)  Rocker arms or cam follower
B)  Lifters/tappets
C)  Valve springs
D)  Valve guides and/or pushrodsE) A) and B)
F) None of the above

Question 7

To lower and narrow a valve seat that has been cut at a 45-degree angle, use a cutter or stone of what angle?

Accepted Answer

A)  60 degrees
B)  30 degrees
C)  15 degrees
D)  45 degreesE) B) and C)
F) A) and D)

Question 8

Never remove more material from the tip of a valve than ________ inches.

Accepted Answer

A)  3070.050
B)  0.020
C)  0.001
D)  0.002E) B) and C)
F) None of the above

Question 9

Which part of this valve is called the valve margin?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) B) and C)
G) A) and B)

Question 10

A valve seat should be concentric to the valve guide to a maximum TIR (total indicator runout)  of ________.

Accepted Answer

A)  0.004 in.
B)  0.002 in.
C)  0.006 in.
D)  0.0015 inE) B) and C)
F) A) and D)

Question 11

Technician A says that a pilot is placed into the valve guide to position the stone or cutter correctly for resurfacing the valve seat. Technician B says that he installed height should be checked and corrected with oversized valves, if needed. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) B) and C)
F) A) and B)

Question 12

Umbrella-type valve stem seals ________.

Accepted Answer

A)  Fit tightly onto the valve stem
B)  Lock under the valve retainer
C)  Fit tightly onto the valve guide
D)  Fit on the valve face to prevent combustion leaksE) A) and C)
F) None of the above

Question 13

Technician A that says free and positive are two types of valve rotators. Technician B says that valve grinding should start with truing the valve tip; then the face should be refinished. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) B) and C)
F) None of the above

Question 14

Technician A says that valve stem height should be checked and the top of the valve ground, if necessary. Technician B says that after a thorough cleaning, the cylinder head should be assembled using new valve stem seals. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) C) and D)
F) B) and D)

Question 15

Technician A says that valve springs should be kept with the valve at the time of disassembly and tested for squareness and proper spring force. Technician B says that the exhaust valve is about 50 percent of the size of the intake valve. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) A) and D)
F) C) and D) A

Question 16

Valve spring inserts (shims)  are designed to ________.

Accepted Answer

A)  Decrease installed height of the valve
B)  Decrease valve spring pressure to compensate for decreased installed height
C)  Adjust the correct valve spring installed height
D)  Increase installed height of the valveE) B) and D)
F) All of the above

Question 17

The proper relationship between intake and exhaust valve diameter is ________.

Accepted Answer

A)  Exhaust valve size is 85% of intake valve size
B)  Intake valve size is 85% of exhaust valve size
C)  Intake valve size is 45% of exhaust valve size
D)  Exhaust valve size is 38% of intake valve sizeE) B) and C)
F) C) and D)

Question 18

Which of these is the most common valve spring keeper?

Accepted Answer

A)  Horseshoe
B)  Clip
C)  Conical
D)  Split keepersE) B) and C)
F) A) and C) D

Question 19

Dampers (damper springs)  are used inside some valve springs to ________.

Accepted Answer

A)  Keep the valve spring attached to the valve
B)  Decrease valve spring pressure
C)  Retain valve stem seals
D)  Prevent valve spring surgeE) B) and C)
F) None of the above

Question 20

The type of valve in use today is a ________ valve.

Accepted Answer

A)  Elliptical
B)  Aluminum
C)  Poppet
D)  RhodiumE) B) and D)
F) B) and C)

Exam 31: Valve and Seat Service

If an interference angle is machined on a valve or seat, the angle is usually ________.

Correct AnswerverifiedShow Answer

Which of these components is the valve seal?

Correct AnswerverifiedShow Answer

Technician A says that the exhaust valve is larger than the intake valve to ensure that all the exhaust gases leave the cylinder. Technician B says that the exhaust valve is larger than the intake valve to ensure proper heat dissipation. Who is right?

Correct AnswerverifiedShow Answer

Installed height is the distance between the valve spring ________ and the underside of the valve spring retainer.

Correct AnswerverifiedShow Answer

Technician A says that all valves rotate to help prevent the valves and seats from burning. Technician B says that positive type valve rotators are only used on intake valves. Who is right?

Correct AnswerverifiedD

In a normally operating engine, intake and exhaust valves are opened by a cam and closed by ________.

Correct AnswerverifiedShow Answer

To lower and narrow a valve seat that has been cut at a 45-degree angle, use a cutter or stone of what angle?

Correct AnswerverifiedShow Answer

Never remove more material from the tip of a valve than ________ inches.

Correct AnswerverifiedShow Answer

Which part of this valve is called the valve margin?

Correct AnswerverifiedShow Answer

A valve seat should be concentric to the valve guide to a maximum TIR (total indicator runout) of ________.

Correct AnswerverifiedShow Answer

Technician A says that a pilot is placed into the valve guide to position the stone or cutter correctly for resurfacing the valve seat. Technician B says that he installed height should be checked and corrected with oversized valves, if needed. Who is right?

Correct AnswerverifiedShow Answer

Umbrella-type valve stem seals ________.

Correct AnswerverifiedShow Answer

Technician A that says free and positive are two types of valve rotators. Technician B says that valve grinding should start with truing the valve tip; then the face should be refinished. Who is right?

Correct AnswerverifiedShow Answer

Technician A says that valve stem height should be checked and the top of the valve ground, if necessary. Technician B says that after a thorough cleaning, the cylinder head should be assembled using new valve stem seals. Who is right?

Correct AnswerverifiedShow Answer

Technician A says that valve springs should be kept with the valve at the time of disassembly and tested for squareness and proper spring force. Technician B says that the exhaust valve is about 50 percent of the size of the intake valve. Who is right?

Correct AnswerverifiedA

Valve spring inserts (shims) are designed to ________.

Correct AnswerverifiedShow Answer

The proper relationship between intake and exhaust valve diameter is ________.

Correct AnswerverifiedShow Answer

Which of these is the most common valve spring keeper?

Correct AnswerverifiedD

Dampers (damper springs) are used inside some valve springs to ________.

Correct AnswerverifiedShow Answer

The type of valve in use today is a ________ valve.

Correct AnswerverifiedShow Answer

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