Question 1

What typically causes damage to the valve head?

Accepted Answer

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?

Accepted Answer

B

Question 3

Springs that have been overheated will stretch and be longer.

Accepted Answer

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?

Accepted Answer

The answer of Technician A says that weak valve springs...

Question 5

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

Accepted Answer

The answer of In reference to the valve-face angle, what...

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?

Accepted Answer

Technician A is incorrect because valve stems need to be lubricated during reassembly. Technician B is also incorrect because intake and exhaust seals are not always the same materials and shapes. Therefore, neither technician is correct.

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?

Accepted Answer

Basket-type coil springs are installed with the tighter part of the coil against the head to prevent the spring from collapsing when the valve is closed. Grinding a valve seat will not affect the installed height of the valve spring because the installed height is determined by the length of the spring and the amount of preload applied to the spring.

Question 8

Valves will contract as they warm up during use.

Accepted Answer

Valves typically expand when they warm up due to thermal expansion, a physical property where materials expand in volume with an increase in temperature.

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?

Accepted Answer

Technician B is correct. Sometimes valve seat angles (3) are cut at the same time with a special cutter. However, Technician A is incorrect because the first angle cut conventionally is not always the throat. It depends on the specific engine and manufacturer specifications.

Question 10

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

Accepted Answer

The answer of When grinding valve seats, some machinists will...

Question 11

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

Accepted Answer

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?

Accepted Answer

Exhaust valves typically endure more extreme temperatures and conditions compared to intake valves, leading to the practice of welding a hardened tip on many exhaust valve stems to increase durability and wear resistance. Technician A's statement is incorrect because it is generally the exhaust valves that take more punishment due to higher temperatures and corrosive gases they are exposed to.

Question 13

Install O-ring seals after the springs.

Accepted Answer

Installing O-ring seals after the springs ensures proper sealing and prevents leakage.

Question 14

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

Accepted Answer

The answer of How have manufacturers and machine shops solved...

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?

Accepted Answer

Neither technician is entirely correct. Valve stems are typically made of materials like steel or titanium, and they may be coated with various substances like zinc, nickel, or chrome, but not Teflon. There is no evidence to suggest that chrome is more popular in Europe than any other stem coating option.

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?

Accepted Answer

Technician A is correct that springs should be tested for squareness, tension, and height. Technician B's method of correcting spring pressure by stacking shims is not an accurate or reliable way of doing so.

Question 17

List three types of valve springs.

Accepted Answer

The answer of 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?

Accepted Answer

Technician B is correct that out-of-square springs can cause uneven valve guide wear. Technician A's statement about discarding a 2" spring that is 1/16" out of square is not necessarily true without more context about the specific application and manufacturer's specifications. It could be within acceptable limits, or it could be too far out of tolerance.

Question 19

What is the margin of a valve?

Accepted Answer

The answer of 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?

Accepted Answer

Both technicians are correct. There are pushrods available that can be cut to length, and some Ford engines are originally equipped with different length pushrods.

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

What typically causes damage to the valve head?

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?

Springs that have been overheated will stretch and be longer.

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?

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

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?

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?

Valves will contract as they warm up during use.

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?

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

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

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?

Install O-ring seals after the springs.

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

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

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?

List three types of valve springs.

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?

What is the margin of a valve?

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?