Workbook, Heavy Duty Truck Systems, 6E
Chapter Seventeen – Answer Key
1. The purpose of the __________________is to transfer crankshaft torque to the torque
converter assembly.
2. Which of the following is the input drive member of a torque converter?
3. Which of the following must always rotate at crankshaft speed when a torque converter is
used to drive an automatic transmission?
4. Technician A says that torque converter coupling phase means the impeller and turbine
are running within 10 percent of the same speed. Technician B says that the only time the
turbine and the impeller rotate at identical speeds is when the lockup clutch is engaged.
Who is correct?
5. Technician A says that all heavy-duty trucks with automatic transmissions use centrifugal
lockup converters. Technician B says that a centrifugal lockup clutch consists of a piston,
clutch plate, and back plate. Who is correct?
6. Technician A says that if it is necessary to rebuild a stator assembly, the needle bearing
should be removed first. Technician B says that cracked stator vanes can be repair-
welded using the TIG welding process. Who is correct?
7. What type of stator tends to be found in heavy-duty truck torque converters?
8. When does a stator begin to freewheel?
9. At what pressure should shop air be regulated to test a sealed-weld torque converter?
10. When is vortex flow at a maximum in a torque converter?