GF27.20-P-5102AHM Torque Converter Lockup Clutch, Component Description

GF27.20-P-5102AHM Torque converter lockup clutch, component description
- TRANSMISSION 722.904/906/999
- refinement package
- as of model year 09

Component Identification:

Location
The torque converter lockup clutch is integrated in the torque converter.

Task
The torque converter lockup clutch minimizes the power losses of the torque converter by reducing converter slip. The engine speed reduces as a result and the efficiency of the transmission is improved.

Component Identification:

The external plate carrier is connected to the impeller via the converter housing. The internal plate carrier is connected to the turbine wheel.

Function
When actuated by the fully integrated transmission-control control unit (Y3/8n4), oil pressure controlled by the torque converter lockup clutch control solenoid valve (Y3/8y8) is directed through the input shaft to the pressure chamber behind the piston. The piston presses the clutch pack together and thus enables direct torque transmission between the impeller and turbine wheel. The torque converter lockup clutch is connected in all gears depending on engine speed and engine load. The torsional damper damps the vibrations coming from the engine. This improves comfort and saves wear and tear on the mechanical components of the transmission.