C 2500 Truck 2WD V8-454 7.4L (1988)
Torque Converter: Description and Operation
THM 400/475 Transmission
Stator, Alternator
Description
The converter also has a smaller vaned section, called a stator, that funnels the oil back to the converter pump through smaller openings, at increased
speed. The speeded up oil directs additional force to the engine-driven converter pump, thereby multiplying engine torque. In other words, without the
stator, the unit is nothing more than a fluid coupling.
The stator assembly in some transmissions is a variable pitch unit The stator blades are operated at either of two positions: maximum or high angle, and
minimum or low angle.
Maximum or high an le means greater redirection of the oil an increased engine speed, and torque multiplication for maximum performance. At engine
idle, it reduces the converter's efficiency, reducing "creep." Minimum or low angle results in a more efficient converter for cruising operation.
Torque Converter
Description
The torque converter is of welded construction and is serviced as an assembly. The unit is made up of two vaned sections, or halves, that face each other
in an oil filled housing. The pump half of the converter is connected to the engine and the turbine half is connected to the transmission.
When the engine makes the converter pump revolve, it sends oil against the turbine, making it revolve also. The oil then returns in a circular flow back to
the converter pump, continuing this flow as long as the engine is running.
