Torque Converter Study Guide
What is the coupling ratio of a non lock up converter?
.9:1
What is the coupling ratio of a lock-up torque converter?
1:1
How many components are there in a non-lock up Converter?
3 (Impeller, stator, turbine)
What would happen if the Stator one-way clutch would fail to freewheel at crusie?
RPM increases
If stall speed specs are 2000 +/_ and tests results are only 1800, list the components that could cause this?
TCC drag, stationary shaft slipping, damaged or broken
When should TCC not be engaged?
acceleration
When do you have maximum efficiency in a torque converter?
at coupling point, cruising speed
When is the vortex flow at its maximum?
at stall
Why is TCC used?
better fuel economy
What keeps the turbine from turning during a stall test?
brakes
The stator is allowed to rotate in what direction?
clockwise
What components control the TCC?
control valve, TCM
How is the impellar driven?
driven by engine RPM
When does maximum torque multiplication occur?
during stall test procedure
if you reuse a Torque Converter, what must be check?
endplay, power flush, pre-lube
True/False Engine stall speed produces maximum rotary flow?
false
In which gears is the TCC used?
forward gear at cruise
With the torque converter and transmission installed, what should be checked?
freeplay
What are guide rings used for?
helps to produce a path for the fluid flow
How is the TCC released?
hydraulically
Which components in the converter have slip guide rings?
impeller or turbine
Where is the clutch located in a lock-up converter?
in the middle of the housing and turbine
The turbine is connected to what?
input shaft
What would happen if the Engine RPM if the stator one-way clutch would fail to lock-up at stall?
it wouldn't redirect the fluid, engine RPM decreases
Which failed converter component will cause severe fluid overheating, discoloring and poor cruise?
locked stator
When will a converter with excessive turbine to pump clearance be most ineffiecent?
low RPM, heavy acceleration
What could cause a TCC to drag?
mechanical, electrical, hydraulic
Can you torque test a stator?
no
Should you completely fill a converter before you install it in the transmission?
no
What can cause a high stall reading?
slipping bands or clutches
What is the stator connected to?
stationary shaft
Which components must be indexed when installing a converter?
stator to stationary shaft, turbine to input shaft, hub to pump, OD shaft
What is the purpose of a neutral stall test?
test the stator
Which component is the sprag in?
the one way clutch
What is the purpose of the stator?
to redirect fluid flow
Why is TCC not used for vehicle breakaway(take off) ?
torque multiplication
True/False An installed torque converter must rotate and move in and out freely?
true
Is there a specified converter to flex plate clearance?
yes, 0"
