1. Understanding Torque Operation
Introduction to Torque Convertor Diagnosis

2. Outline
Introduction to torque convertors Components of a torque convertor Functions of each component Types of oil flow Four stages of operation Diagnosing lock up torque convertors Diagnosing noisy torque convertors

3. Today you sat at a light with your foot on the brake, and the car in gear and when the light turned green you acceleratecd and drove away. And now for the rest of the story

4. Job description Allows the car to idle at a stop sign
Slips during initial acceleration
Locks up on the highway

5. The Torque convertor is the link between the engine and the transmission

6. Consider the operation of two fans placed close together

7. Here are the basic components of a torque convertor

8. The function of the components

9. A stator makes the convertor more efficient

10. There are two types of oil flow happening inside a convertor

11. Stages of operation Stall stage
Engine Speed
Impeller_______________
Stator__________________
Turbine________________
Holding
Stationary

12. Torque multiplication
Impeller_________________
Stator___________________
Turbine__________________
Engine Speed
Holding
Turning

13. Coupling Stage Engine Speed Impeller_________________
Stator ____________________
Turbine___________________
Free wheeling
Up to 9/10 Engine Speed

14. Lock up stage What is the maximum efficiency of this convertor?
Could we make it more efficient?
What if we locked the turbine to the convertor housing?

15. Lock up convertor diagnosis
typically only lock up in higher ratios
Usually the engine must be warm
Typically unlock when brake applied

16. Convertor noise
Occasionally you will encounter a noisy convertor

17. Convertor stall test
Demo in shop