Question 1

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

Accepted Answer

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?

Accepted Answer

Most transmissions require more than just cleaning the valve body during a rebuild, and aluminum valve bodies are generally more prone to wear than cast iron ones.

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?

Accepted Answer

Tech A is correct because reaming out valves and installing larger ones is a common practice to improve or repair valve bodies. Tech B is also correct because for small shops, purchasing rebuilt valve bodies can be more cost-effective than investing in the equipment and time needed for reaming and installing larger valves.

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?

Accepted Answer

Both Tech A and Tech B are correct. Many shops do install remanufactured valve bodies during transmission rebuilds, and the valve body often requires significant service during an overhaul.

Question 5

Identify the component shown in the given figure.

Accepted Answer

The answer of Identify the component shown in the given...

Question 6

Identify the component shown in the given figure.

Accepted Answer

The answer of Identify the component shown in the given...

Question 7

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

Accepted Answer

The answer of ________ is a coating that allows the...

Question 8

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

Accepted Answer

Anodizing is a process that is commonly used on aluminum to increase corrosion resistance and surface hardness. Steel is typically not anodized; it is more commonly treated with processes like galvanization or plating.

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?

Accepted Answer

Valve bodies made of cast iron are generally durable and experience little wear, making Tech A correct.

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?

Accepted Answer

The answer of Tech A states that on modern transmissions,...

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?

Accepted Answer

Both Tech A and Tech B are correct. Valve bodies can be replaced with remanufactured units, and they can also be rebuilt in the shop using specialized equipment.

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?

Accepted Answer

Tech A is correct because a valve body that is too worn may not be able to be rebuilt to a satisfactory level of performance.

Question 13

Identify the device shown in the given figure.

Accepted Answer

The answer of Identify the device shown in the given...

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?

Accepted Answer

Valve bores can be measured, but it requires precision and the right tools to do so accurately.

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?

Accepted Answer

A soft rubber mat placed below the valve body will help prevent the vacuum from leaking out.

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?

Accepted Answer

Tech A is correct because when using a vacuum tester, the valve body should be placed with the transmission case side facing up to properly test for leaks or issues.

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?

Accepted Answer

A different vacuum pump should be used for testing a valve body to ensure that contaminants from air conditioning service do not affect the valve body test.

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?

Accepted Answer

The vacuum pump can become contaminated with transmission fluid if it is not properly maintained or if fluid is accidentally drawn into the pump.

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?

Accepted Answer

Tech B is correct because calibration is essential to ensure the accuracy and reliability of the vacuum testing fixture before testing the valve body.

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.

Accepted Answer

The answer of When calibrating the vacuum testing fixture, the...

Quiz 17: Valve Body and Electric Service

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

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?

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?

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?

Identify the component shown in the given figure.

Identify the component shown in the given figure.

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

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

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?

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?

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?

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?

Identify the device shown in the given figure.

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?

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 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?

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?

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?

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?

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