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

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Question 1

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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

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Question 2

Multiple Choice

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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

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Question 3

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What typically causes damage to the valve head?

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?

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?

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?

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?

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?

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?

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?

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

What is the margin of a valve?

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

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

Valves will contract as they warm up during use.

List three types of valve springs.

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

Install O-ring seals after the springs.

Springs that have been overheated will stretch and be longer.