Exam 31: Valve and Seat Service

Which of these is the most common valve spring keeper?

Technician A says that all valves rotate to help prevent the valves and seats from burning. Technician B says that positive type valve rotators are only used on intake valves. Who is right?

Technician A says that valve springs should be kept with the valve at the time of disassembly and tested for squareness and proper spring force. Technician B says that the exhaust valve is about 50 percent of the size of the intake valve. Who is right?

Technician A says that the exhaust valve is larger than the intake valve to ensure that all the exhaust gases leave the cylinder. Technician B says that the exhaust valve is larger than the intake valve to ensure proper heat dissipation. Who is right?

Valve spring inserts (shims) are designed to ________.

The proper relationship between intake and exhaust valve diameter is ________.

The type of valve in use today is a ________ valve.

Which part of this valve is called the valve margin?

Umbrella-type valve stem seals ________.

Which of these components is the valve seal?

In a normally operating engine, intake and exhaust valves are opened by a cam and closed by ________.

Dampers (damper springs) are used inside some valve springs to ________.

Technician A says that valve stem height should be checked and the top of the valve ground, if necessary. Technician B says that after a thorough cleaning, the cylinder head should be assembled using new valve stem seals. Who is right?

If an interference angle is machined on a valve or seat, the angle is usually ________.

A valve seat should be concentric to the valve guide to a maximum TIR (total indicator runout) of ________.

Installed height is the distance between the valve spring ________ and the underside of the valve spring retainer.

To lower and narrow a valve seat that has been cut at a 45-degree angle, use a cutter or stone of what angle?

Never remove more material from the tip of a valve than ________ inches.

Technician A that says free and positive are two types of valve rotators. Technician B says that valve grinding should start with truing the valve tip; then the face should be refinished. Who is right?

Technician A says that a pilot is placed into the valve guide to position the stone or cutter correctly for resurfacing the valve seat. Technician B says that he installed height should be checked and corrected with oversized valves, if needed. Who is right?