Deck 7: Cylinder Head: Parts and Service

Question 1

Technician A says use kerosene as a spray lube before resurfacing aluminum heads. Technician B says belt sanders are the best method for resurfacing aluminum heads. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technicians

Answer 1

A

Question 2

Technician A says surfacing the head increases combustion chamber CCs. Technician B says the volume is increased by grinding metal from the surface of the combustion chamber or by excessive grinding on valve seats. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Answer 2

B

Question 3

Removal of 0.020" from OHC surfaces will result in 1° of advance in valve timing.

Answer 3

True

Question 4

Technician A says a mushroomed valve can be driven out with a punch and a hammer. Technician B says the mushroomed tip must be dressed with a file before the valve can be removed. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 5

Why are valve guides reamed without lubricant?

Question 6

Technician A says bronze valve guides wear better than iron ones. Technician B says to use SAE 90 oil as a lubricant when machining bronze. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 7

Briefly distinguish between a head called a stock replacement and a bolt-on head.

Question 8

When repairing valve guides, what are two reasons that integral guides are used with iron heads?

Question 9

Technician A says aluminum heads can be checked for cracks with a process known as magnafluxing. Technician B says a red dye penetrant is used to check for cracks on cast iron heads. Which technician is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 10

An aluminum head is discovered to have cracks. Technician A says to repair it by welding with an oxyacetylene welder. Technician B says to use a TIG welder to repair the cracks. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 11

For a positive seal to work properly, the inside of the valve guide must be concentric with the outside (O.D.).

Question 12

Valve guides can be driven in using an air chisel or hammer.

Question 13

Cracks in iron heads can be repaired with threaded plugs. What is this process called?

Question 14

Technician A says in case of extremely hard carbon deposits, an old valve can be used to break off carbon before cleaning. Technician B says some valve spring compressors can be used on or off the car. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 15

Technician A says knurling is a metal displacement process not a cutting process. Technician B says that guides worn as much as 0.012" can be successfully knurled. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 16

Switching to aluminum heads requires lowering the compression ratio.

Question 17

Technician A says aluminum heads usually have an aluminum shim beneath the valve spring. Technician B says as the valves are removed from the head, they should be kept in order. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 18

An engine has excessive valve guide wear. Technician A says to ream the guide and install a new valve with an oversized stem. Technician B says to knurl the valve stem and reinstall it in the guide. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 19

Aluminum melts at 750 degrees Fahrenheit.