UNDERSTANDING TORQUE OPERATION

Introduction to Torque Convertor Diagnosis

OutlineIntroduction to torque convertorsComponents of a torque convertorFunctions of each componentTypes of oil flowFour stages of operationDiagnosing lock up torque convertors Diagnosing noisy torque convertors

Click icon to add pictureToday 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

Job description Allows the car to idle at a stop sign Slips during initial acceleration

Locks up on the highway

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

Consider the operation of two fans placed close

together

Here are the basic components of a torque convertor

The function of the components

A stator makes the convertor more efficient

There are two types of oil flow happening inside a convertor

Stages of operationStall stage

Impeller_______________

Stator__________________

Turbine________________

Engine Speed

Holding

Stationary

Torque multiplication Impeller_________________

Stator___________________

Turbine__________________

Engine Speed

Holding

Turning

Coupling Stage Impeller_________________

Stator ____________________

Turbine___________________

Engine Speed

Free wheeling

Up to 9/10 Engine Speed

Lock up stageWhat is the maximum efficiency of this convertor?

Could we make it more efficient?

What if we locked the turbine to the convertor housing?

Lock up convertor diagnosis

typically only lock up in higher ratios

Usually the engine must be warm

Typically unlock when brake applied

Convertor noise Occasionally you will encounter a noisy

convertor

Convertor stall test Demo in shop