What is typically used between the torque converter and the engine flywheel or crankshaft in a standard installation?

What is typically used between the torque converter and the engine flywheel or crankshaft in a standard installation?

• A. A spacer of at least 1/2 inch thickness
• B. A special insulating material
• C. The torque converter front support bushing
• D. One or more flex plates

Answer: (D)

The interface between the torque converter and the engine crankshaft is a flex plate. This plate bolts to the crankshaft and provides the mounting surface for the torque converter. It also acts as a torsional damper, smoothing out the engine’s torque pulses to reduce stress on the crankshaft and transmission. In many setups it may carry the starter ring gear as well, helping the engine start. A spacer would not provide the proper mounting surface or vibration damping, so it isn’t used. Insulating material between the parts isn’t appropriate for this connection, as it wouldn’t handle the torque and alignment needs. The front support bushing is a component inside the torque converter assembly, not the interface between the converter and the engine. One or more flex plates are the correct solution for this standard installation.

The interface between the torque converter and the engine crankshaft is a flex plate. This plate bolts to the crankshaft and provides the mounting surface for the torque converter. It also acts as a torsional damper, smoothing out the engine’s torque pulses to reduce stress on the crankshaft and transmission. In many setups it may carry the starter ring gear as well, helping the engine start.

A spacer would not provide the proper mounting surface or vibration damping, so it isn’t used. Insulating material between the parts isn’t appropriate for this connection, as it wouldn’t handle the torque and alignment needs. The front support bushing is a component inside the torque converter assembly, not the interface between the converter and the engine. One or more flex plates are the correct solution for this standard installation.