F 250 2WD Pickup V8-7.3L DSL Turbo VIN F (1994)
Torque Converter: Description and Operation
DESCRIPTION AND OPERATION
The torque converter couples the engine to the input shaft of the transmission. It provides torque multiplication and absorbs engine shock caused by gear
shifting.
The converter clutch is an electrically controlled clutch which bypasses the torque converter. This eliminates torque converter slippage and excess heat
generation, resulting in improved fuel economy and vehicle performance. The converter clutch is also used to minimize the perceived engine RPM
change during upshifts and downshifts. The converter clutch hydraulic control allows only On/Off control of the clutch application. Converter clutch
application and release is controlled by the Powertrain Control Module (PCM) or the transmission Electronic Control Assembly (ECA) through
solenoid No. 3.
The converter clutch (piston plate clutch and damper assembly) transmits engine power to the turbine hub and input shaft from the converter cover
during lockup. The converter cover transmits power from the engine into the converter.
The turbine is splined through the turbine hub to the input shaft and driven by fluid from the impeller. The impeller, driven by the converter cover,
pumps transmission fluid within the torque converter.
The reactor gives a hydraulic reaction yielding torque multiplication. Contained within the reactor is a one-way clutch that will hold the reactor stationary
only when reaction is required. The impeller hub drives the pump drive gear.
