Torque Converter: Testing and Inspection

TORQUE CONVERTER CLUTCH TEST

NOTE: Engine coolant temperature must be above 128° and below 240° F. This temperature can be obtained after approximately 15 minutes of highway driving. Since most converter clutch shifts are difficult to feel, a tachometer and/or vacuum gauge must be connected to engine.

1. Drive vehicle at approximately 50 mph and, while maintaining this speed, tap the brake pedal with the left foot.
2. The engine RPM and vacuum should increase when the clutch disengages, with light brake pedal application, and decrease when the pedal is released and the clutch engages.