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

Question 1

List three types of valve springs.

Answer 1

There are several types of valve springs including: uniform pitch variable pitch basket coil (variable rate) beehive mechanical vibration dampeners

Question 2

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

Answer 2

B

Question 3

Springs that have been overheated will stretch and be longer.

Answer 3

True

Question 4

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 5

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

Question 6

What is the margin of a valve?

Question 7

Valves will contract as they warm up during use.

Question 8

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 9

What typically causes damage to the valve head?

Question 10

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

Question 11

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 12

Install O-ring seals after the springs.

Question 13

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 14

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 15

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

Question 16

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 17

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 18

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

Question 19

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 20

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