Deck 17: Valve Body and Electric Service

Question 1

On modern transmissions, some of the valves are operated by pulse-width-modulated solenoids. This causes the valves to:

A) be stationary.
B) move when a transmission shift is needed.
C) move whenever the vehicle is in motion.
D) move when travelling on bumpy roads.

Answer 1

C

Question 2

Tech A states that most transmissions will only need the valve body cleaned during a rebuild. Tech B states that cast iron valve bodies are more prone to wear than aluminum ones. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Answer 2

D

Question 3

Tech A says that it is possible to ream out valves in the valve body and install larger valves for some transmissions. Tech B says that for a small shop it is more economical to purchase rebuilt valve bodies. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Answer 3

C

Question 4

Tech A states that many shops will simply install a remanufactured valve body in every transmission they rebuild. Tech B states that the valve body will often require the majority of the service during the overhaul. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 5

Identify the component shown in the given figure.

A) Cast iron valve body
B) Aluminum valve body
C) Steel valve body
D) Nickel coated valve body

Question 6

Identify the component shown in the given figure.

A) Nickel coated valve body
B) Steel valve body
C) Aluminum valve body
D) Cast iron valve body

Question 7

________ is a coating that allows the valve to move more easily and helps prevent wear.

A) Reaming
B) Electroplating
C) Anodizing
D) Preloading

Question 8

Tech A states that most aluminum valves can be anodized. Tech B states that only steel valves are anodized. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 9

Tech A states that valve bodies made of cast iron experienced little wear. Tech B states that valve bodies made of cast iron failed frequently. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 10

Tech A states that on modern transmissions, some of the valves are operated by pulse-width-modulated solenoids. Tech B states that pulse width modulation causes excessive wear in the soft aluminum of the valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 11

Tech A states that valve bodies can be replaced with remanufactured units. Tech B states that valve bodies can be rebuilt in the shop using some specialized equipment. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 12

Tech A states that it is sometimes not worth rebuilding a valve body if it is too worn. Tech B states all valve bodies can be rebuilt. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 13

Identify the device shown in the given figure.

A) Valve body vacuum tester
B) Lube tester
C) Air tester
D) Solvent tester

Question 14

Tech A states valve bores cannot be measured. Tech B states that valve bores can be measured, but it is very difficult to do so accurately. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 15

Tech A states that a soft rubber mat placed below the valve body will lead to inaccurate readings. Tech B states that a soft rubber mat placed below the valve body will help prevent the vacuum from leaking out. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 16

A vacuum tester is used to test the valve body of an engine. Tech A states that the valve body should be placed down onto the mat with the transmission case side of the valve body facing up. Tech B states that the transmission case side of the valve body should face down. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 17

Tech A states that the same vacuum pump used for air conditioning service can be used for testing a valve body. Tech B states that a different vacuum pump should be used for testing a valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 18

The vacuum pump used for air conditioning service is used to test the valve body using a vacuum tester. Tech A states that the pump can become contaminated with the transmission fluid. Tech B states that addition of transmission fluid in the pump does not damage the pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 19

Tech A states that the vacuum testing fixture does not need calibration. Tech B states that the vacuum testing fixture needs to be calibrated before testing the valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 20

When calibrating the vacuum testing fixture, the valve on the pump inlet port should be adjusted so that the gauge indicates ________ of mercury.

A) 10"
B) 8"
C) 5"
D) 0"

Question 21

A vacuum reading of ________ of mercury on the vacuum testing fixture indicates a valve or bore that is completely worn out and must be repaired.

A) 5"
B) 10"
C) 15"
D) 25"

Question 22

A vacuum reading of ________ of mercury on the vacuum testing fixture indicates a valve with no leakage.

A) 5"
B) 10"
C) 15"
D) 25"

Question 23

A valve is at less than 18" of mercury when tested in a vacuum tester. Tech A states that all valves below this value need to replaced. Tech B states that this value may vary based on each shop warranty policy. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 24

If the forward abuse bore plug of a valve body is worn, it can result in ________.

A) delayed reverse engagement
B) AFL pressure loss
C) leaks
D) clutch slip

Question 25

Tech A states that forward abuse bore plug is a common wear item and should always be checked. Tech B states that a worn forward abuse bore plug can result in a burned low reverse clutch. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 26

Identify the critical wear area of the valve body being tested in the given figure.

A) Reverse abuse valve
B) TCC regulator valve
C) End plugs
D) Sequence valve

Question 27

Choose the correct procedure to remove a valve or bore plug from a valve body in case all the other procedures fail.

A) Mild heat can be applied to loosen the grip.
B) Install a self-tapping screw into an aluminum valve or bore plug and use vice grip pliers to pull it out.
C) Hammer the sides of the plug to bring it out.
D) Use heavy air pressure to push the valve out.

Question 28

Which of the following should you do when removing clips or roll pins that hold valves in place?

A) If the valve is held in place by a pin, use a small pick to remove it.
B) Use a pick to press in slightly on the valve to compress the spring behind the valve.
C) Retain all springs in the bore.
D) Use a pick on the lands of the valves.

Question 29

Tech A says that you should disassemble the valve body carefully and keep the parts organized. Tech B states that it is not necessary to keep the parts organized as the valves are identified in the rebuild manuals. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 30

All of the following instruments can be used for checking the valve bore clearance except:

A) a feeler gauge.
B) a digital caliper.
C) a micrometer.
D) a telescoping gauge.

Question 31

Choose the correct statement with respect to vacuum testing.

A) The valve should be calibrated before testing.
B) The valve should be placed on a soft rubber mat to seal the ports.
C) The fittings in the pump are usually copper with plastic lines.
D) The fittings should be tightened with maximum force.

Question 32

Tech A states that valve body bores should be measured with a telescoping bore gauge. Tech B states that a vacuum testing system should be used for testing valve bodies. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 33

When valve bores are cleaned with a bore brush:

A) also use a solvent for a good finish.
B) clean it for an extended period of time for a good finish.
C) very little cleaning is typically needed.
D) clean it until the bore is slightly enlarged.

Question 34

A whetstone can be used to:

A) correct warpage in the transmission case surface.
B) correct bends in the valve body springs.
C) clean up a small amount of damage to the sealing surface of the valve body.
D) enlarge the accumulator bore.

Question 35

Tech A states that a warped valve body must be replaced. Tech B states that a warped valve body can be straightened out on a surface grinder. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 36

If the valve body is not going to be reinstalled into the transmission immediately:

A) wipe it with emery cloth and store in the parts bin.
B) coat it with the correct automatic transmission fluid and place it in a ziplock bag.
C) do not attempt to clean it.
D) do not lubricate the valve body.

Question 37

Tech A states that all valves in the valve body should be lubricated with transmission assembly lubricant before installing them. Tech B states that all valves should be checked to make sure they can move freely. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 38

All of the following are permissible when testing a solenoid except:

A) checking the resistance using an ohmmeter.
B) air-testing the solenoid.
C) cleaning the screen at the end of the solenoid.
D) cleaning the solenoids in a solvent tank.

Question 39

When testing solenoids Tech A states that you should use an ohmmeter to test all of the solenoids. Tech B says that it is better to apply electricity to all of the solenoids to test them. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 40

Tech A states that all solenoids should be replaced in a valve body during an overhaul. Tech B states that the solenoids should be tested and cleaned thoroughly before reusing them. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 41

Tech A states that PCS solenoids should be cycled in clean automatic transmission fluid. Tech B states that there are pressure testing fixtures available for some transmissions. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 42

When measuring resistance across a normally closed pressure switch, the reading should go:

A) from close to zero to infinity.
B) down close to zero.
C) up to 10 ohms.
D) down to 0.5 ohms.

Question 43

Tech A sates that the pressure switches in a transmission should be tested with an ohmmeter. Tech B states that all pressure switches should be replaced during an overhaul. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 44

Tech A states that many shops will simply install a remanufactured valve body in every transmission they rebuild. Tech B states that the valve body will often require the majority of the service during the overhaul. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 45

Identify the component shown in the given figure.

A) Cast iron valve body
B) Aluminum valve body
C) Steel valve body
D) Nickel coated valve body

Question 46

Identify the component shown in the given figure.

A) Nickel coated valve body
B) Steel valve body
C) Aluminum valve body
D) Cast iron valve body

Question 47

________ is a coating that allows the valve to move more easily and helps prevent wear.

A) Reaming
B) Electroplating
C) Anodizing
D) Preloading

Question 48

Tech A states that most aluminum valves can be anodized. Tech B states that only steel valves are anodized. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 49

Tech A states that valve bodies made of cast iron experienced little wear. Tech B states that valve bodies made of cast iron failed frequently. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 50

Tech A states that on modern transmissions, some of the valves are operated by pulse-width-modulated solenoids. Tech B states that pulse width modulation causes excessive wear in the soft aluminum of the valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 51

Tech A states that valve bodies can be replaced with remanufactured units. Tech B states that valve bodies can be rebuilt in the shop using some specialized equipment. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 52

Tech A states that it is sometimes not worth rebuilding a valve body if it is too worn. Tech B states all valve bodies can be rebuilt. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 53

Identify the device shown in the given figure.

A) Valve body vacuum tester
B) Lube tester
C) Air tester
D) Solvent tester

Question 54

Tech A states valve bores cannot be measured. Tech B states that valve bores can be measured, but it is very difficult to do so accurately. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 55

Tech A states that a soft rubber mat placed below the valve body will lead to inaccurate readings. Tech B states that a soft rubber mat placed below the valve body will help prevent the vacuum from leaking out. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 56

A vacuum tester is used to test the valve body of an engine. Tech A states that the valve body should be placed down onto the mat with the transmission case side of the valve body facing up. Tech B states that the transmission case side of the valve body should face down. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 57

Tech A states that the same vacuum pump used for air conditioning service can be used for testing a valve body. Tech B states that a different vacuum pump should be used for testing a valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 58

The vacuum pump used for air conditioning service is used to test the valve body using a vacuum tester. Tech A states that the pump can become contaminated with the transmission fluid. Tech B states that addition of transmission fluid in the pump does not damage the pump. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 59

Tech A states that the vacuum testing fixture does not need calibration. Tech B states that the vacuum testing fixture needs to be calibrated before testing the valve body. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 60

When calibrating the vacuum testing fixture, the valve on the pump inlet port should be adjusted so that the gauge indicates ________ of mercury.

A) 10"
B) 8"
C) 5"
D) 0"

Question 61

A vacuum reading of ________ of mercury on the vacuum testing fixture indicates a valve or bore that is completely worn out and must be repaired.

A) 5"
B) 10"
C) 15"
D) 25"

Question 62

A vacuum reading of ________ of mercury on the vacuum testing fixture indicates a valve with no leakage.

A) 5"
B) 10"
C) 15"
D) 25"

Question 63

A valve is at less than 18" of mercury when tested in a vacuum tester. Tech A states that all valves below this value need to replaced. Tech B states that this value may vary based on each shop warranty policy. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 64

If the forward abuse bore plug of a valve body is worn, it can result in ________.

A) delayed reverse engagement
B) AFL pressure loss
C) leaks
D) clutch slip

Question 65

Tech A states that forward abuse bore plug is a common wear item and should always be checked. Tech B states that a worn forward abuse bore plug can result in a burned low reverse clutch. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 66

Identify the critical wear area of the valve body being tested in the given figure.

A) Reverse abuse valve
B) TCC regulator valve
C) End plugs
D) Sequence valve