How to Fill a Torque Converter: Expert Tips and Guidelines

Torque converters are an essential component of automatic transmissions. They are responsible for transferring power from the engine to the transmission, allowing your vehicle to move. If you’ve recently overhauled your car’s transmission system or noticed that your torque converter is low on fluid, you may be wondering how to fill it. In this guide, we’ll walk you through the process of filling a torque converter, step by step.

Checking Torque Converter Fluid Level

Before you can fill your torque converter, you need to check the fluid level. The torque converter shares the same fluid as the transmission system, so you’ll need to check the transmission fluid level to determine the torque converter fluid level. Here’s how:

1. Park your vehicle on a flat surface and start the engine.
2. Locate the transmission dipstick under the hood, towards the back of the engine bay.
3. Remove the dipstick and clean it with a rag.
4. Reinsert the dipstick fully and pull it out again.
5. Check the fluid level and condition on the stick.

If the fluid level is low or the fluid is black or brownish with a burnt smell, you’ll need to change the fluid.

Draining and Refilling a Torque Converter

There are several methods for filling a torque converter, and the best method for your vehicle will depend on its make and model. Here are three common methods:

Method 1: Draining Through the Torque Converter Plug

1. Locate the torque converter plug under the vehicle.
2. Start the engine and let it run for 10 seconds, then shift to neutral and turn off the ignition.
3. Place a drain pan beneath the drain plug.
4. Loosen the plug and allow the fluid to drain out.
5. Once all the fluid has drained, replace and tighten the plug.
6. Refill the transmission fluid through the transmission dipstick tube.

Method 2: Draining and Refilling Through the Transmission

1. Locate the transmission pan at the bottom of the transmission.
2. Remove the pan by loosening the bolts, allowing the fluid to drain into the pan.
3. Replace the transmission filter.
4. Secure the pan back onto the transmission.
5. Refill the system with new fluid through the transmission fluid dipstick tube.

Method 3: Power Flushing (Professional Mechanic Recommended)

1. Connect a machine to the transmission to flush out the old fluid and replace it with new fluid.

Will the Torque Converter Fill Itself?

Yes, the torque converter will fill itself once the engine is started. The transmission pump circulates the fluid, filling the converter in the process. However, it’s important to add some fluid to the converter before installing it to prevent a dry start and unnecessary wear.

How to Install a Torque Converter

Installing a torque converter requires lubricating its hub and pump seal with transmission fluid. Then, align the converter’s input shafts with the transmission pump’s slots and gently push the converter into place. Rotate the converter while pushing to ensure it’s fully seated.

Final Thoughts

Filling a torque converter is an essential part of maintaining your vehicle’s transmission health. Whether you’re installing a new converter or servicing an existing one, it’s crucial to ensure it’s correctly filled with the appropriate transmission fluid. By following the steps outlined in this guide, you can ensure your torque converter is properly filled and functioning correctly.