Deck 7: Cylinder Head: Parts and Service

Question 1

Switching to aluminum heads requires lowering the compression ratio.

Answer 1

False

Question 2

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

Answer 2

C

Question 3

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

Answer 3

Cracks in iron heads can be repaired with threaded plugs. This process is known in the industry as pinning a crack or stitching a crack.

Question 4

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

Question 5

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 6

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 7

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

Question 8

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

Question 9

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 10

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

Question 11

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

Question 12

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 13

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 14

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

Question 15

Aluminum melts at 750 degrees Fahrenheit.

Question 16

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

Question 17

Why are valve guides reamed without lubricant?

Question 18

When heating an aluminum OHC head to prepare for straightening, a(n) _____ should be used to correctly gauge the temperature.

Question 19

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 20

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 21

When performing procedure 2, care should be taken so as not to bend what part?

Question 22

Technician A says that OHC cylinder heads often have oil galleries in them. Technician B says that pushrod engine cylinder heads often have oil galleries in them. Who is right?

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

Question 23

Which cylinder heads should not be cleaned by glass beading?

Question 24

Name three types of valve guide seals.
A.
B.
C.

Question 25

A valve guide has 0.015" bellmouth wear. Technician A says to knurl and then ream the guide to size. Technician B says to repair the guide with a replaceable guide insert. Who is right?

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

Question 26

Technician A says that on some engines, guide seals have to be installed on exhaust valves only. Technician B says that even though two valve guide seals might look alike, one could be made of a rubber that will survive longer under higher temperature. Who is right?

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

Question 27

Before using a valve spring compressor, what part of the valve and spring assembly should be struck with a short piece of pipe and a hammer?

Question 28

As valves are removed during disassembly, should they be kept in order?

Question 29

What caution is necessary when setting an OHC head on a bench?

Question 30

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

Question 31

What is the maximum amount of warpage allowed on an aluminum head before it must be resurfaced?

Question 32

What name describes the shape in which valve guides wear?

Question 33

What is the name given to an inexpensive metal displacement method of resizing a valve guide?

Question 34

An engine has excessively worn exhaust guides. Technician A says to look for weak or short exhaust valve springs. Technician B says that this can cause excessive crankcase pressure. Who is right?

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

Question 35

Would smoke during deceleration most likely be traced to the seal for the intake or exhaust guide?

Question 36

When cracks are repaired using tapered, threaded plugs, what is this called?

Question 37

Name four methods of crack detection.
A.
B.
C.
D.

Question 38

List two methods of head resurfacing.
A.
B.

Question 39

Describe two ways of measuring valve stem-to-guide clearance.
A.
B.

Question 40

When repairing a crack, what should be done to both ends of the crack to prevent it from growing larger?

Question 41

Technician A says that valve stem-to-guide clearance can be measured using a dial indicator. Technician B says that valve stem-to-guide clearance can be measured using a feeler gauge. Who is right?

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

Question 42

Technician A says that if a camshaft does not turn easily, the head probably requires straightening. Technician B says that if the cam side of an OHC head is warped excessively, the head can be straightened. Who is right?

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

Question 43

Technician A says that Magnaflux is a crack detection method that is commonly used on aluminum heads. Technician B says that bead blasting is the preferred method for cleaning OHC heads. Who is right?

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

Question 44

A cylinder head has required substantial metal removal to make it flat. Technician A says that a shim can be installed under the head gasket to compensate. Technician B says that on OHC engines, the valve timing will be retarded. Who is right?

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

Question 45

An engine has a warped cylinder head. Technician A says that this could be caused by running the engine with a faulty thermostat. Technician B says that this could be because the engine was overheated. Who is right?

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