Torque converter auto trans

Most modern torque converters multiply torque in the range of _____? 3:1 - 3.5:1 1.5:1 - 2:1 2:1 - 2.5:1 2.5:1 - 3:1

2:1 - 2.5:1

What type of clutch material is generally used for a TCC that is duty cycled on and off? Carbon fiber Woven graphite Cellulose/paper All three answers are correct

Cellulose/paper

Automatic transmission fluid being thrown out by the engine rotation of the torque converter pump (impeller), is what type of fluid flow? Coupling Centrifugal Vortex Rotary

Centrifugal

What is the term that relates to the torque converter, where a vehicle is driven at 50 mph in high gear then you mash the throttle and observe the tachometer reading. - Loose Converter Test - Converter Flash Test - Tight Converter Test - Converter Stall Test

Converter Flash Test

At what vehicle road speed does the converter reach its "coupling phase"? - Only at highway speeds - Deceleration speed - Acceleration speed - Coupling does not necessarily occur at a specific speed

Coupling does not necessarily occur at a specific speed

How much is engine torque increased or multiplied when a typical torque converter is at stall speed? Double Four times Eight times Ten times

Double

When does a torque converter produce the least amount of heat? - During cruising - During mechanical lock-up - During deceleration - During acceleration

During mechanical lock-up

What was the name of the first transmission to use a fully automatic torque converter? Ford-O-Matic Hy-Drive Dynoflow Jet-A-Way

Dynoflow

What does EC3 or ECCC stand for? - Electronically Controlled Capacity Clutch - Electronically Commanded Clutch Control - Electronically Commanded Captive Clutch - Electronically Controlled Clutch Control

Electronically Controlled Capacity Clutch

What is the formula for Stall Torque Ratio? - STR = Exact Output torque x Exact Input Torque - STR = Exact Output torque divided by Exact Input Torque - STR = Exact Input torque divided by Exact Output Torque - STR = Exact Input torque x Exact Output Torque

Exact Output torque divided by Exact Input Torque

The part that allows for the torque converter to expand without causing damage to other components is the _____. Flexplate Impeller Turbine Bell housing

Flexplate

What is the most popular type of TCC used in today's torque converters? - Hydraulically applied single disc clutch - Viscous clutch - Centrifugal type clutch - Multiple clutch disc & plate type

Hydraulically applied single disc clutch

The angle of these help determine stall speed?

Impellar fins

The major function of a torque converter clutch is to? - Decrease harshness of engine engagement, using a control slippage technique. - Increase the operating temperature of the fluid, by eliminating slippage. - Increase powertrain efficiency at higher speeds, by eliminating slippage. - Drive planetary members, thereby increasing their torque capacity

Increase powertrain efficiency at higher speeds, by eliminating slippage.

If line pressure is low what effect will this have on stall speeds? - Increased stall speed - Will have no effect on stall speed - Unchanged stall speed - Decreased stall speed

Increased stall speed

Which compound gear set uses a planetary gear set in front of a Ravigneaux gear set? Simple gear set Lapelletier gear set Ravigneaux gear set Simpson gear set

Lapelletier gear set

Which compound planetary gear set is commonly used in six-speed transmissions? Ravigneaux gear set Simpson gear set Simple gear set Lapelletier gear set

Lapelletier gear set

Torque converter clutches are used to compensate for? - Low fluid level in the torque converter - Loss of torque during closed throttle downshifts - Loss of rpm due to direct mechanical drive - Loss of efficiency due to fluid slippage

Loss of efficiency due to fluid slippage

What is the device used as a pressure relief mechanism in the converter to release TCC while coasting? Coast Buildup Valve Stator Flow Valve Poppet Valve Torque Converter Clutch

Poppet Valve

What two flow paths does the fluid take as it sent through the torque converter? Spiral & Vortex Centrifugal & Vortex Rotary & Centrifugal Rotary & Vortex

Rotary & Vortex

What is the flow of oil in a torque converter that happens when the impeller and turbine rotate at similar speeds? Stator flow Centrifugal flow Rotary flow Vortex flow

Rotary flow

What kind of a planetary gear set uses a common sun gear? Lapelletier gear set Simple gear set Simpson gear set Ravigneaux gear set

Simpson gear set

Using a torque converter smaller than stock size could result in ____________. - Reduced fuel economy - Faster than normal acceleration - Slower than normal acceleration - Faster than normal acceleration with reduced fuel economy

Slower than normal acceleration

What is the formula for "stall"? - Stall = Input Torque x Output Torque - Stall = The Square Root of Input Torque x The Square Root of Output Torque - Stall = K-factor divided by Output Torque - Stall = The Square Root of Input Torque x K-factor

Stall = The Square Root of Input Torque x K-factor

what is the torque multiplier in TC?

Stator

Most of the heat generated in an automatic transmission comes from the _____. Torque converter Cooler Pressure controls Gearbox

TC

In a computer controlled system, the PWM converter clutch will only apply when: - Fluid pressure flows between the clutch and the converter cover. - The vehicle is traveling over 35 mph. - The vehicle is in third or fourth gear. - The PCM switches power in the clutch solenoid circuit shutting off fluid to the clutch.

The PCM switches power in the clutch solenoid circuit shutting off fluid to the clutch.

What could happen if the technician installs the too long of bolts into the torque converter? - The TCC may chatter - The flexplate could crack around the crankshaft mounting area - The converter will have a vibration - The bolt will loosen up and cause a noise concern

The TCC may chatter

Which statement is true about the centrifugal converter clutch? - The clutch applies only in first and second gear ranges. - The clutch applies to the converter cover when rotating speed is high enough. - The clutch damper plate assembly is driven by a one-way clutch. - This style converter clutch is more practical than the pressure-plate type.

The clutch applies to the converter cover when rotating speed is high enough.

What is the formula for STR (Stall Torque Ratio)? - The exact input torque ÷ the exact output torque - The exact output torque ÷ the exact input torque - The k-factor divided by the square root of the input torque - The k-factor divided by the square root of the output torque

The exact output torque ÷ the exact input torque

What does the "K" factor mean on a torque converter? - The speed of one member divided by the square root of the torque of the same member - The capacity of the fluid being used in the production of torque - The amount of difference between the impeller and the stator - The amount of speed difference between the impeller and turbine at coupling speed

The speed of one member divided by the square root of the torque of the same member

When the ATF leaves the turbine vanes then strikes the concave, or front side of the stator vanes, this is referred to as _____. Torque multiplication phase Converter flow phase Coupling phase Lockup phase

Torque multiplication phase

What are the three main elements of a torque converter? - Impeller, input shaft and turbine - Turbine, TCC and fluid - Turbine, stator, and impeller - Impeller, turbine and stator support

Turbine, stator, and impeller

What is the flow of oil in a torque converter that happens when the impeller and turbine rotate at different speeds? Centrifugal flow Stator flow Vortex flow Rotary flow

Vortex flow

When is torque multiplication by the stator possible? - When the turbine and the impeller are turning the same speed - When the impeller and the stator are turning the same speed - When the stator and the turbine are turning the same speed - When the impeller and the turbine are at great differences in speed

When the impeller and the turbine are at great differences in speed

When is the converter at its "coupling phase"? - When the turbine speed is 10 % of impeller speed - When the turbine speed is 90 % of impeller speed - When the turbine speed is 100 % of impeller speed - When the turbine speed is 50 % of impeller speed

When the turbine speed is 90 % of impeller speed

Under which of the following conditions would an on/off converter clutch most likely be off (not applied)? - Direct drive - Overdrive - Coolant temperature above 86˚F (30˚C) - Wide Open Throttle

Wide Open Throttle

what TC is hard to identify at stall speed?

bald

Tech A says on a Ford when the TCC solenoid is electrically off the TCC is hydraulically on. Tech B says on a GM when the TCC solenoid is electrically off the TCC is hydraulically off. WIC?

both

Tech A says that a malfunctioning stator one-way clutch could cause the vehicle to lack power at higher speeds. Tech B says that a malfunctioning stator one-way clutch could cause a loss of power at lower speeds. WIC?

both

Tech A says that if the torque converter gets too hot it can balloon out and cause the crank to push forward. Tech B says that if the torque converter gets too hot it can discolor. WIC?

both

Tech A says that if the wrong stall speed converter is installed in a vehicle, it could result in poor performance and/or bad gas mileage. Tech B says that if the wrong stall speed converter is installed in a vehicle, it could cause it not to move at all. WIC?

both

Tech A says that if too low a stall speed converter is installed on a vehicle, the engine may feel as though it needs a tune-up. Tech B says that if too high a stall speed converter is installed on the vehicle, it may feel as though it has a slipping one-way clutch. WIC?

both

Tech A says that the torque converter clutch on a computer controlled vehicle is applied and released by fluid pressure that is controlled by the PCM. Tech B says that the TCC piston in the torque converter is operated by a solenoid, which could stick causing the engine to stall/die. WIC?

both

Tech A says that the torque converter cover is connected to the engine crankshaft via the flexplate. Tech B says that the torque converter impeller is connected to the engine crankshaft via the flexplate. WIC?

both

Tech A says that weights if attached to the converter are in place to balance the converter. Tech B says that weights if attached to the converter could be to balance the engine crankshaft. WIC?

both

Technician A says that a held member is also called the reaction member. Technician B says that if any two elements are locked together, then the output will be 1:1. Who is correct?

both

Technician A says that five-speed automatic transmission will often use a compound planetary gear set. Technician B says that the torque converter clutch is often pulsed on and off to provide smooth engagement. Who s correct?

both

Technician A says that one planetary gear set can provide gear reduction, overdrive, and reverse. Technician B says that most transmissions today use compound (multiple) planetary gear sets. Who is correct?

both

Technician A says that when an automatic transmission/transaxle shifts into overdrive, the output shaft is rotating faster (higher RPM) than the engine crankshaft. Technician B says that an overdrive ratio is a ratio where the first number is less than 1. Who is correct?

both

What are the weights called that Chrysler puts on their vintage RWD converters that are used for engine balancing? Converter balance weights Motor balance weights Dragonfly weights Butterfly weights

butterfly weights

On most automatic transmissions, in which direction does the stator rotate or freewheel, when viewed from the front of the transmission? - Neither clockwise or counterclockwise - Clockwise - Both clockwise and counter clockwise - Counterclockwise

clockwise

What is the pressure mechanism in some torque converters used to release the TCC while coasting? - Cruise Pop-off Valve - Coast Relief Valve - Acceleration Pop-off Valve - Deceleration Relief Valve

coast relief valve

What is it called, when the stator, turbine, and impeller are all rotating in the same direction at approximately the same speed? Lockup phase Torque multiplication phase Converter flow phase Coupling phase

coupling phase

what occurs at road speed in a TC?

coupling phase

what does the stator do at coupling phase?

free wheels

what does the PCM supply to energize the solenoid?

ground

what is created by fluid shear?

heat

what pushes fluid into turbine?

impellar

What does the term "offset" mean on a torque converter? - It is the difference between the stator fin angle and the turbine fin angle - It is referring to the clearance between the converter hub and the pump gears - it is referring to the bolt pattern where the converter bolts to the flex plate - It is the difference between the impeller fin angle and the turbine fin angle

it is referring to the bolt pattern where the converter bolts to the flex plate

what kind of TC increases fuel milage?

lockup

What is the term used to describe a torque converter that has excessive clearances? Loose Tight Flash Stall

loose

Tech A says that a GM converter's size is determined by its overall diameter. Tech B says that a Ford converter's size is determined by its turbine diameter.

neither

Tech A says that a PWM solenoid type TCC will have the clutch applied 100% of the time when on. Tech B says that an on/off solenoid type TCC can be applied anywhere between 0 and 100% of the time. WIC?

neither

Tech A says that the torque converter stator increases torque by redirecting fluid back into the turbine. Tech B says that fluid from the TC turbine is forced into the impeller to form a fluid coupling. WIC?

neither

what does it mean when the TC pads are not equally spaced?

offset

When is vortex flow and torque multiplication at its greatest in the torque converter? At cruising speed On acceleration On deceleration At a stop

on acceleration

what engages into the crankshaft in a TC?

pilot

Which component of the torque converter clutch creates the lockup of the torque converter? Piston Impeller Turbine Stator

piston

what part of the lockup TC that pushes into the cover?

piston

What is another name for the impeller in the torque converter? Stator Pump One way clutch Turbine

pump

Type of one way clutch in the stator

sprag

when is the most heat generated in a TC?

stall

Which part of the torque converter is also known as (AKA) the "reactor"? Stator Turbine Cover Impeller

stator

Two technicians are discussing automatic transmissions/transaxles. Technician A says that it is normal for a vehicle to move slightly when the gear selector is in the drive position with the brakes released. Technician B says that the stator may be defective if the vehicle moves while in gear when the engine is at idle speed. Who is correct?

tech a

Technician A says that all dual clutch automatic transmissions use two dry clutches. Technician B says that some automatic transmissions do not use planetary gear sets. Who is correct?

tech b

what parts do you inspect before installing the converter?

threads

what occurs from a stop until road speed?

torque multiplication

What part of the converter is responsible for catching the fluid being thrown out by the pump/impeller? Stator Turbine Cover Impeller

turbine

what is connected to the input shaft?

turbine

What is the fluid flow circulating between the impeller and the turbine turning at different speeds is called? Rotary Coupling Vortex Centrifugal

vortex