Deck 8: Cylinder Head: Springs, Valves, and Valve Sets

Question 1

What typically causes damage to the valve head?

Answer 1

Heat is usually the cause of damage to the valve head. If a valve does not cool properly, it will quickly overheat and burn.

Question 2

Technician A says heating a pressed-fit stud before installing it into the head makes installation easier. Technician B says stud-mounted rockers are oiled through hollow pushrods. Who is right?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Answer 2

B

Question 3

Springs that have been overheated will stretch and be longer.

Answer 3

False

Question 4

Technician A says that weak valve springs can impede heat transfer between the valve faces and seats. Technician B says that wear can be evident on the top when a valve spring has too little tension. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 5

In reference to the valve-face angle, what is the purpose of a flatter interference angle?

Question 6

Technician A says there is no need to lubricate the valve stems upon reassembly. Technician B says intake and exhaust seals are the same materials and shapes. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 7

Technician A says that basket-type coil springs are installed with the tighter part of the coil against the head. Technician B says grinding a valve seat will not affect the installed height of the valve spring. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 8

Valves will contract as they warm up during use.

Question 9

Technician A says the first angle cut conventionally is the throat. Technician B says sometimes valve seat angles (3) are cut at the same time with a special cutter. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 10

When grinding valve seats, some machinists will grind the 45-degree angle after the 60-degree angle.

Question 11

Cam-in-block engines use pushrods to transmit motion from the lifters to the rocker arms.

Question 12

Technician A says intake valves take the most punishment and should always be replaced whenever in doubt. Technician B says many exhaust valve stems have a welded on hardened tip. Who is right?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 13

Install O-ring seals after the springs.

Question 14

How have manufacturers and machine shops solved the problem of valve seat recession?

Question 15

Technician A says valve stems are often coated with Teflon. Technician B says chrome is the popular stem coating in Europe. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 16

Technician A says springs should be tested for squareness, tension, and height. Technician B says to stack VSI shims under a valve spring until the spring pressure is correct. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 17

List three types of valve springs.

Question 18

Valve springs are being discussed. Technician A says you should discard a 2" spring that is 1/16" out of square. Technician B says out-of-square springs can cause uneven valve guide wear. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 19

What is the margin of a valve?

Question 20

Technician A says there are pushrods available you can cut to length. Technician B says some Ford engines are originally equipped with different length pushrods. Who is correct?

A)Technician A
B)Technician B
C)Both technicians
D)Neither technician

Question 21

Technician A says that a burned exhaust valve can result from a valve seat that is too narrow. Technician B says that an exhaust valve seat should be wider than an intake valve seat. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 22

Are O-ring guide seals installed before or after the valve spring is compressed?

Question 23

List three sources of valve seating pressure.
A.
B.
C.

Question 24

With what head design can valve clearance be adjusted prior to installation of the head on the engine?

Question 25

Technician A says that basket-type coil springs are installed with the tighter part of the coil against the head. Technician B says that grinding a valve seat will decrease the installed height of the valve spring. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 26

Which length pushrod will be needed if a valve seat has been ground too deep?
A. Shorter
B. Longer

Question 27

What is the approximate width of a larger (15⁄8") exhaust valve seat? _____"

Question 28

What is done to a replacement valve seat ring to shrink it for easier installation?

Question 29

Which valve would most often have a hardened tip?
A. Intake
B. Exhaust

Question 30

Two technicians are discussing the interference angle. Technician A says that it helps a reground valve to seat because it causes increased valve seat pressure. Technician B says that a 1⁰ difference between the valve face and seat angles is enough to cause the valve to leak and burn. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 31

List three tests made on valve springs.
A.
B.
C.

Question 32

Technician A says to grind less than 0.020" from the tip of a valve stem to avoid grinding through the hardened area. Technician B says that the tip should be ground approximately the same amount as the face and seat in order to minimize valve guide wear by centering the rocker arm on the stem tip when the valve is half open. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 33

VSI shims are available in 0.015", 0.030", and 0.060" sizes. True or false?

Question 34

Repairs to what part of the head must be completed prior to refinishing the seats?

Question 35

By what process are integral seats usually hardened?

Question 36

What is the approximate width of a larger (17⁄8") intake valve seat? _____"

Question 37

What are the names of the three valve seat angles?
A.
B.
C.

Question 38

Technician A says that a valve spring's pressure may be 10% less than the manufacturer's specifications before it must be replaced. Technician B says that valve seating pressure is the amount of force that the valve spring exerts on the area of contact between the valve face and seat. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 39

What is the name of the part of the valve that becomes too thin when excessive metal is ground from the valve face?

Question 40

To correctly position the valve seat about 1⁄32" from the outer edge of a 45° valve face, which angle would you grind?
​A. 30°
B. 60°
​

Question 41

Technician A says that after refinishing a 45⁰ valve seat, a 30⁰ angle should be used to position the valve seat on the valve face. Technician B says that before a valve guide is repaired, the valve seat should always be ground. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 42

Technician A says that most exhaust valves are smaller than intake valves because exhaust gases are under high pressure. Technician B says that intake valves are larger than exhaust valves. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 43

Technician A says that the face of the valve should overhang slightly into the combustion chamber when the valve is closed. Technician B says that the throat angle would most likely result in a ruined valve seat if ground too much. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 44

Technician A says that narrow valve seats exert a higher force on the seat area. Technician B says that if intake and exhaust valve springs are of equal pressure, then the larger valve must have a narrower seat in order to have the same seating pressure as the smaller valve. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 45

Technician A says that the sodium filling used in some exhaust valve stems lightens the valve for better low-speed operation. Technician B says that a valve that has a wide margin must be replaced. Who is right?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B