Question 1

When rebuilding a transmission, most shops will:

Accepted Answer

Most shops will replace the torque converter with a rebuilt one to ensure reliability and compatibility with the rebuilt transmission.

Question 2

A torque converter has the main benefit over a manual transmission of:

Accepted Answer

A torque converter provides torque multiplication, which allows for smoother acceleration and better performance at low speeds compared to a manual transmission.

Question 3

A torque converter does all of the following except:

Accepted Answer

A torque converter does not transmit lower amounts of torque as engine speed increases; instead, it is designed to multiply torque and efficiently transfer power from the engine to the transmission.

Question 4

When there is a large difference between the speed of the impeller and the turbine:

Accepted Answer

Maximum torque multiplication occurs when there is a large difference in speed between the impeller and the turbine, as this condition allows the torque converter to multiply engine torque effectively.

Question 5

Tech A says that the impeller is splined to the input shaft. Tech B says that the stator is fixed solidly to the torque converter housing. Who is correct?

Accepted Answer

The impeller is typically welded or otherwise attached to the torque converter housing, not splined to the input shaft. The stator is mounted on a one-way clutch, allowing it to rotate in one direction and lock in the other, but it is not fixed solidly to the torque converter housing.

Question 6

Tech A says that the torque converter can multiply the amount of torque transmitted from the engine to the transmission. Tech B says that the torque converter allows the engine to idle when the vehicle stops in traffic. Who is correct?

Accepted Answer

The torque converter can indeed multiply torque, and it also allows the engine to idle when the vehicle is stopped, making both Tech A and Tech B correct.

Question 7

The purpose of the stator in a torque converter is to:

Accepted Answer

The stator in a torque converter redirects the flow of transmission fluid to increase the torque output, allowing for torque multiplication.

Question 8

Tech A says that the torque converter hub drives the front pump in an automatic transmission. Tech B says that the turbine shaft drives the front pump. Who is correct?

Accepted Answer

The torque converter hub is connected to the engine and drives the front pump in an automatic transmission, not the turbine shaft.

Question 9

Stall speed is defined as:

Accepted Answer

Stall speed refers to the maximum speed difference between the impeller and turbine in the torque converter, indicating the point at which the engine can no longer increase RPMs without the vehicle moving.

Question 10

The average torque multiplication for a torque converter in a passenger car is:

Accepted Answer

The answer of The average torque multiplication for a torque...

Question 11

Tech A says that the front pump only operates when the turbine is rotating. Tech B says that a torque converter clutch locks the turbine to the converter housing when applied. Who is correct?

Accepted Answer

Tech B is correct because the torque converter clutch, when applied, locks the turbine to the converter housing, allowing for a direct drive. Tech A is incorrect because the front pump operates whenever the engine is running, not just when the turbine is rotating.

Question 12

Tech A states that torque converters are completely filled with transmission fluid during operation. Tech B states that torque converters push air around inside like a fan. Who is correct?

Accepted Answer

Torque converters are filled with transmission fluid during operation, which allows them to transfer power from the engine to the transmission. They do not push air around like a fan.

Question 13

Torque converters create excess heat that must be removed by:

Accepted Answer

Torque converters generate excess heat during operation, which can be dissipated using a transmission cooler in the radiator, an external cooler, or deep finned oil pans. All these methods help in cooling the transmission fluid and maintaining optimal operating temperatures.

Question 14

What is achieved when the transmission fluid first runs through the external cooler and then through the cooler in the radiator?

Accepted Answer

Running the transmission fluid through the external cooler first and then the radiator cooler helps to prevent overcooling by allowing the radiator to slightly warm the fluid if it becomes too cool.

Question 15

Tech A states that it is important to keep transmission fluid temperature as low as possible. Tech B states that transmission fluid must be kept about 230 degrees for optimum operation. Who is correct?

Accepted Answer

The answer of Tech A states that it is important...

Question 16

Lock-up torque converters are controlled by:

Accepted Answer

Lock-up torque converters are controlled by a combination of hydraulic valves and electric solenoids, which work together to engage and disengage the lock-up clutch.

Question 17

Tech A states that lock up torque converters are either fully applied or fully released. Tech B states that many manufacturers will pulse the torque converter on to prevent harsh application. Who is correct?

Accepted Answer

The answer of Tech A states that lock up torque...

Question 18

Tech A states that the torque converter should be replaced in the event of catastrophic transmission failure. Tech B states that it is possible to flush out the converter on a specialized flushing machine. Who is correct?

Accepted Answer

In the event of catastrophic transmission failure, it is often recommended to replace the torque converter to prevent contamination of the new transmission. However, it is also possible to flush out the converter using a specialized flushing machine, though this may not always be as effective.

Question 19

Tech A states that lock up torque converters will set a trouble code when they fail. Tech B states that a failed lock up torque converter system may require the rebuild of the transmission. Who is correct?

Accepted Answer