Chap 5

If the stall speed is lower than specified, what could be the cause?

A slipping stator clutch

A torque converter can multiply engine torque at the stall speed by about ________.

Double

During the coupling phase in a torque converter, the stator one-way clutch remains locked.

False

The input or driving member of the converter is the ________.

Impeller

A vehicle creeps faster than normal when the engine is cold. What is the most likely cause?

Normal operation

A torque converter should be checked by a technician for all of the following EXCEPT ________.

Proper balance

A torque converter's turbine end-play has measured to be 0.070 in (1.5 mm). What action should the technician take?

Replace or rebuild the torque converter

The fluid flow around the circumference of the converter is called ________ flow.

Rotary

Stall testing can be used to find ________.

Slipping bands Slipping clutches A slipping stator clutch

A stall test is used to check the ________.

Stator

Lock-up torque converters use a damper assembly to dampen ________.

Torsional vibration

During the coupling phase the ________.

Vortex flow nearly stops

What test is being performed in this photograph?

Leakage Test

Which of these components is attached to the transmission input shaft?

Turbine

The parts of a torque converter include ________.

Turbine, impeller, and stator

The fluid flow from the impeller through the turbine and stator is called ________ flow.

Vortex

In a lock-up torque converter, the ________.

Both Clutch plate is splined onto the turbine shaft and Clutch lining transfers power through a mechanical connection during lock-up

A torque converter is being discussed. Technician A says that the turbine provides torque input to the transmission gear set through the input shaft. Technician B says that the pump (impeller) is the driving member and the turbine is the driven member. Which technician is correct?

Both technicians

Technician A says that at stall speed the impeller is spinning as fast as the engine can drive it. Technician B says that at stall speed the turbine is stationary. Which technician is correct?

Both technicians

Technician A says that fluid motion inside a converter is controlled by the guide ring. Technician B says that fluid motion inside a converter is controlled by the stator vanes. Which technician is correct?

Both technicians

Technician A says that the flexplate connects the torque converter to the crankshaft. Technician B says that the torque converter is considered part of the transmission. Which technician is correct?

Both technicians

Technician A says that the torque multiplication phase can occur when the stator one-way clutch begins to freewheel. Technician B says that the torque multiplication phase can occur when the stator one-way clutch locks up. Which technician is correct?

Both technicians

Creep is ________.

Caused by slippage inside the torque converter Normal operation Causes the vehicle to move slightly when the engine is at idle speed and the transmission in a drive gear

The torque converter clutch circuit is controlled by the ________.

Command from the PCM/TCM

When the impeller and turbine are rotating at about the same speed, this is called ________.

Coupling

The torque converter clutch is controlled by a hydraulic clutch pedal.

False

In most lock-up torque converters, lock-up occurs when the ________.

Fluid flow in the converter is reversed

A modified engine may need a torque converter that ________.

Has a higher stall speed Is "looser" Is smaller in diameter

The stator is mounted on a ________.

One way clutch

Technician A says that the torque converter impeller is attached to the flexplate and turns as the engine rotates. Technician B says that the turbine is attached to the flexplate and turns as the engine rotates. Which technician is correct?

Tech A