DeVille V8-252 4.1L VIN 8 FI (1983)
Torque Converter Clutch: All Technical Service Bulletins
III. TCC Operation
A.
Converter Clutch Apply Valve - Determines the method of oil feed to the torque converter to engage or disengage the clutch mechanism. The
apply valve is located in the pump assembly on THM 200-4R transmissions and in the caser assembly on THM 325-4L transmissions.
FIGURE 2 - Converter Clutch Released (THM 200-4R Shown - THM 325-4L Typical)
B.
Converter Clutch in Released Position (refer to Figure 2) - When the TCC solenoid is not energized, converter signal oil is exhausted
allowing the converter clutch apply valve spring to hold the apply valve in the release position. The apply valve in this position takes
converter feed oil and sends it into the release passage, and into the cavity between the converter clutch pressure plate and the converter
cover. This moves the clutch pressure plate away from the converter cover, releasing the converter clutch.
After the oil releases the converter clutch, it flows from behind the pressure plate and through the converter. From the converter, the oil flows
backwards through the apply passage to the apply valve. The apply valve then sends oil, returning from the converter, to the transmission
cooler in the radiator. Oil, returning from the cooler, is then directed to the transmission lubrication system.
