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

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Question 21

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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

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Question 22

Multiple Choice

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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

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Question 23

Short Answer

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

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

List three types of valve springs.

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

Springs that have been overheated will stretch and be longer.

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 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?

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?

What typically causes damage to the valve head?

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

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

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?

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?

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

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

Valves will contract as they warm up during use.

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

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