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

Springs that have been overheated will stretch and be longer.

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

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

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

What typically causes damage to the valve head?

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

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?

Valves will contract as they warm up during use.

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?

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

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

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

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?

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?

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

List three types of valve springs.

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

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?