ILM 190303 B

Question 1

What is Hydrodynamic Drive?

Answer 1

The process where fluid is used to transfer power.

Question 2

What is a Fluid Coupling?

Answer 2

The method where two spinning objects are transferring power by Hydrodynamics.

Question 3

What is the impeller connected to?

Answer 3

The input shaft from the engine.

Question 4

What is the turbine connected to?

Answer 4

The output shaft to the transmission.

Question 5

What are some advantages of fluid couplings?

Answer 5

No mechanical linkage, shock absorption, gradual application of torque.

Question 6

What are some disadvantages of fluid couplings?

Answer 6

Energy loss due to slippage, excessive heat production.

Question 7

What are the two types of fluid flow within a torque converter?

Answer 7

Vortex and Rotary Flow

Question 8

What are the characteristics of Vortex flow?

Answer 8

When the turbine is moving slower than the impeller producing high heat, low speed and high torque.

Question 9

What are the characteristics of Rotary Flow?

Answer 9

When the turbine and impeller are moving generally the same speed, producing high speed and low torque.

Question 10

What is the Split Guide Ring used for?

Answer 10

To prevent turbulence between the oil.

Question 11

What is the purpose of a stator?

Answer 11

The stator redirects the flow of the oil towards the impeller to be multiplied.

Question 12

What are the two types of stators?

Answer 12

Fixed and Freewheeling

Question 13

What are some characteristics of a fixed stator?

Answer 13

It is fixed to the housing and prevents rotary flow.

Question 14

What are some characteristics of a freewheeling stator?

Answer 14

This utilizes sprag overrunning clutches to unlock the stator and allow rotary flow when the turbine matches impeller speed.

Question 15

What are the three phases in a torque converter?

Answer 15

1. Converting Phase where the turbine is moving slower than the impeller.
2. Coupling Phase where both move at the same speed.
3. Lockup where both are locked with clutches.

Question 16

What are stages?

Answer 16

How many times the oil gets redirected to the turbine before it returns to the impeller.

Question 17

What is stall speed?

Answer 17

The largest difference in speed between the impeller and turbine. The turbine would not be moving.

Question 18

What is a variable pitch stator?

Answer 18

A stator where the blades can change position as torque is required.

Question 19

In what positions does a variable pitch stator produce the most and least amount of torque?

Answer 19

The most is achieved in the open blades position.

The lease is achieved in the closed blades position.

Question 20

At what temperature does transmission oil begin to break down?

Answer 20

121 Decrees Celsius or 250 Fahrenheit

Question 21

What two types of housings are used in torque converter design? What is one big difference?

Answer 21

Dry housings that are sealed

& Wet Housings that incorporate PTO’s

Question 22

What is the difference between a torque converter and a torque divider?

Answer 22

A torque divider utilizes a planetary gearset.

Question 23

How is a torque divider connected inside?

Answer 23

Impeller to Sun
Turbine to Ring
Planetary Carrier to Output

Question 24

What produces a high stall speed upon test?

Answer 24

Torque converter not working, or Transmission clutches slipping.

Question 25

What produces a low stall speed upon test?

Answer 25

Torque converter freewheeling stator failing. No torque being developed.

Question 26

How do you perform a leak test on a sealed dry housing?

Answer 26

Submerge in liquid and pressurize to 70 PSI.

Question 27

What is the most important step after installing a torque converter?

Answer 27

Check crankshaft endplay.