Question 1

Valve ________ occurs when both valves are open at the same time at the end of the exhaust stroke and at the beginning of the intake stroke.

Accepted Answer

A) Overlap 
B) Rotation 
C) Collision 
D) Inversion 
A) Overlap 
B) Rotation 
C) Collision 
D) Inversion A

Question 2

Which type of valve guide is most used in a cast-iron head?

Accepted Answer

A) Integral 
B) Powdered metal (PM) 
C) Bronze 
D) Thin-wall sleeve type 
A) Integral 
B) Powdered metal (PM) 
C) Bronze 
D) Thin-wall sleeve type A

Question 3

Technician A says that the intake valve runs hotter than the exhaust valve because the intake valve has the greater surface area. Technician B says that the exhaust valves usually do not burn due to the scavenging effect of the exhaust stream. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B 
A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B D

Question 4

For lowest hydrocarbon emissions, which of these engine design features is used?

Accepted Answer

A) Increased (as much as possible) quench area 
B) Low combustion chamber surface area-to-volume ratio 
C) High combustion chamber surface area-to-volume ratio 
D) Non-centrally mounted spark plug 
A) Increased (as much as possible) quench area 
B) Low combustion chamber surface area-to-volume ratio 
C) High combustion chamber surface area-to-volume ratio 
D) Non-centrally mounted spark plug

Question 5

Some vehicle manufacturers recommend repairing integral guides with ________.

Accepted Answer

A) Replacement valve guides 
B) Knurling 
C) Valve guide inserts 
D) OS stem valves 
A) Replacement valve guides 
B) Knurling 
C) Valve guide inserts 
D) OS stem valves

Question 6

Typical intake valve stem-to-guide clearance is ________.

Accepted Answer

A) 0.001 to 0.004 inch (0.025 to 0.076 mm) 
B) 0.015 to 0.020 inch (0.4 to 0.5 mm) 
C) 0.030 to 0.045 inch (0.8 to 0.10 mm) 
D) 0.005 to 0.010 inch (0.13 to 0.25 mm) 
A) 0.001 to 0.004 inch (0.025 to 0.076 mm) 
B) 0.015 to 0.020 inch (0.4 to 0.5 mm) 
C) 0.030 to 0.045 inch (0.8 to 0.10 mm) 
D) 0.005 to 0.010 inch (0.13 to 0.25 mm)

Question 7

Which of these statements is TRUE about surface finish?

Accepted Answer

A) Cast-iron surfaces should be smoother than aluminum surfaces 
B) A cylinder head should be much smoother than a crankshaft journal 
C) The rougher the surface, the higher the microinch finish measurement 
D) The smoother the surface,the higher the microinch finish measurement 
A) Cast-iron surfaces should be smoother than aluminum surfaces 
B) A cylinder head should be much smoother than a crankshaft journal 
C) The rougher the surface, the higher the microinch finish measurement 
D) The smoother the surface,the higher the microinch finish measurement

Question 8

Cylinder heads with four valves flow more air than those with two valves because they ________.

Accepted Answer

A) Increase the velocity of the air 
B) Use a higher lift camshaft 
C) Have a greater open area 
D) Both A and C 
A) Increase the velocity of the air 
B) Use a higher lift camshaft 
C) Have a greater open area 
D) Both A and C

Question 9

The use of a knurling tool is being described. After the knurling tool displaces the metal inside the guide, a ________ is run through the guide to produce a restored, serviceable valve guide.

Accepted Answer

A) Reamer 
B) Drill bit 
C) Ball gauge 
D) File 
A) Reamer 
B) Drill bit 
C) Ball gauge 
D) File

Question 10

Pressed-in valve ________ are used in aluminum heads

Accepted Answer

A) Guides 
B) Seat inserts 
C) Springs 
D) Both A and B 
A) Guides 
B) Seat inserts 
C) Springs 
D) Both A and B

Question 11

To help ensure proper engine cooling, most cylinder head designs use ________.

Accepted Answer

A) Long exhaust ports and short intake ports 
B) Large exhaust crossover passages 
C) Short exhaust ports and long intake ports 
D) Coolant passages restricted by head gaskets 
A) Long exhaust ports and short intake ports 
B) Large exhaust crossover passages 
C) Short exhaust ports and long intake ports 
D) Coolant passages restricted by head gaskets

Question 12

What other engine component may have to be machined if the cylinder heads are machined on a V-type engine?

Accepted Answer

A) Intake manifold 
B) Distributor mount (if the vehicle is so equipped) 
C) Exhaust manifold 
D) Block deck 
A) Intake manifold 
B) Distributor mount (if the vehicle is so equipped) 
C) Exhaust manifold 
D) Block deck

Question 13

A warped aluminum cylinder head can be restored to useful service by ________.

Accepted Answer

A) Machining the gasket surface to one-half of the warped amount and then heating the head in an oven and allowing it to cool slowly 
B) Heating it to 500°F for 5 hours and cooling it rapidly before final machining 
C) Grinding the gasket surface and then align honing the camshaft bore 
D) Heating in an oven at 500°F with shims under each end, allowing it to cool, and then machining it 
A) Machining the gasket surface to one-half of the warped amount and then heating the head in an oven and allowing it to cool slowly 
B) Heating it to 500°F for 5 hours and cooling it rapidly before final machining 
C) Grinding the gasket surface and then align honing the camshaft bore 
D) Heating in an oven at 500°F with shims under each end, allowing it to cool, and then machining it

Question 14

Technician A says that an Audi five-valve engine uses three intake valves and two exhaust valves.Technician B says that it uses three exhaust valves and two intake valves. Which technician is correct?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B 
A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B

Question 15

Valve guides are measured using a micrometer and a hole gauge.

Accepted Answer

A) True 
 B)False

Question 16

Resurfacing of the cylinder head has no effect on the compression ratio.

Accepted Answer

A) True 
 B)False

Question 17

Which of these operations should be performed first?

Accepted Answer

A) Grinding the valves 
B) Resurfacing the head 
C) Installing replacement guides 
D) Grinding the seats 
A) Grinding the valves 
B) Resurfacing the head 
C) Installing replacement guides 
D) Grinding the seats

Question 18

Technician A says that cylinder head resurfacing machines include grinders and milling machines.Technician B says that cylinder head reconditioning should start with resurfacing of valves. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B 
A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B

Question 19

The gasket surface of a cylinder head, as measured with a precision straightedge, should have a maximum variation of ________.

Accepted Answer

A) 0.001 inch in any 6-inch length or 0.004 inch overall 
B) 0.004 inch in any 10-inch length or 0.008 inch overall 
C) 0.002 inch in any 6-inch length or 0.004 inch overall 
D) 0.020 inch in any 10-inch length or 0.020 inch overall 
A) 0.001 inch in any 6-inch length or 0.004 inch overall 
B) 0.004 inch in any 10-inch length or 0.008 inch overall 
C) 0.002 inch in any 6-inch length or 0.004 inch overall 
D) 0.020 inch in any 10-inch length or 0.020 inch overall

Question 20

Technician A says that the most commonly used combustion chamber types include hemispherical, and wedge. Technician B says that coolant and lubricating openings and passages are located throughout most cylinder heads. Who is right?

Accepted Answer

A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B 
A) Technician A only 
B) Technician B only 
C) Both technicians A and B 
D) Neither technician A nor B

Exam 30: Cylinder Head and Valve Guide Service

Valve ________ occurs when both valves are open at the same time at the end of the exhaust stroke and at the beginning of the intake stroke.

Which type of valve guide is most used in a cast-iron head?

Technician A says that the intake valve runs hotter than the exhaust valve because the intake valve has the greater surface area. Technician B says that the exhaust valves usually do not burn due to the scavenging effect of the exhaust stream. Who is right?

For lowest hydrocarbon emissions, which of these engine design features is used?

Some vehicle manufacturers recommend repairing integral guides with ________.

Typical intake valve stem-to-guide clearance is ________.

Which of these statements is TRUE about surface finish?

Cylinder heads with four valves flow more air than those with two valves because they ________.

The use of a knurling tool is being described. After the knurling tool displaces the metal inside the guide, a ________ is run through the guide to produce a restored, serviceable valve guide.

Pressed-in valve ________ are used in aluminum heads

To help ensure proper engine cooling, most cylinder head designs use ________.

What other engine component may have to be machined if the cylinder heads are machined on a V-type engine?

A warped aluminum cylinder head can be restored to useful service by ________.

Technician A says that an Audi five-valve engine uses three intake valves and two exhaust valves.Technician B says that it uses three exhaust valves and two intake valves. Which technician is correct?

Valve guides are measured using a micrometer and a hole gauge.

Resurfacing of the cylinder head has no effect on the compression ratio.

Which of these operations should be performed first?

Technician A says that cylinder head resurfacing machines include grinders and milling machines.Technician B says that cylinder head reconditioning should start with resurfacing of valves. Who is right?

The gasket surface of a cylinder head, as measured with a precision straightedge, should have a maximum variation of ________.

Technician A says that the most commonly used combustion chamber types include hemispherical, and wedge. Technician B says that coolant and lubricating openings and passages are located throughout most cylinder heads. Who is right?

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