At a Glance
- The gasket between the transmission pan and the transmission case can fail, causing fluid to leak.
- By following the steps outlined in this guide, you can successfully fix an automatic transmission fluid leak and restore your transmission to optimal performance.
- The cost of repairing a transmission fluid leak depends on the source of the leak and the severity of the damage.
An automatic transmission fluid leak can be a serious problem, leading to transmission damage and costly repairs. If you notice a red or brown fluid leak under your car, it’s important to take action quickly. This comprehensive guide will provide you with step-by-step instructions on how to fix an automatic transmission fluid leak, saving you time and money.
Identifying the Source of the Leak
Before you can fix the leak, you need to identify its source. Common leak points include:
- Pan gasket: The gasket between the transmission pan and the transmission case can fail, causing fluid to leak.
- Input shaft seal: The seal around the input shaft, where it enters the transmission, can become worn or damaged, allowing fluid to escape.
- Output shaft seal: The seal around the output shaft, where it exits the transmission, can also fail, causing a leak.
- Transmission cooler lines: The lines that carry transmission fluid to and from the transmission cooler can develop leaks.
Step-by-Step Repair Guide
1. Safety First
- Park the vehicle on a level surface and engage the parking brake.
- Allow the engine to cool completely.
- Wear safety glasses and gloves when working on the transmission.
2. Locate the Leak
- Use a flashlight to inspect the transmission and surrounding areas for signs of fluid leakage.
- Check the transmission pan, input shaft, output shaft, and transmission cooler lines.
3. Replace the Pan Gasket
- Remove the transmission pan bolts.
- Carefully remove the transmission pan and discard the old gasket.
- Clean the mating surfaces of the transmission case and pan.
- Apply a thin layer of transmission fluid to the new gasket and install it.
- Reinstall the transmission pan and tighten the bolts to the specified torque.
4. Replace the Input Shaft Seal
- Remove the transmission input shaft seal.
- Clean the input shaft and seal bore.
- Lubricate the new seal with transmission fluid and install it into the seal bore.
- Reinstall the transmission input shaft.
5. Replace the Output Shaft Seal
- Remove the transmission output shaft seal.
- Clean the output shaft and seal bore.
- Lubricate the new seal with transmission fluid and install it into the seal bore.
- Reinstall the transmission output shaft.
6. Replace the Transmission Cooler Lines
- Disconnect the transmission cooler lines from the transmission.
- Replace the old lines with new ones.
- Tighten the cooler line fittings to the specified torque.
7. Refill the Transmission Fluid
- Check the transmission fluid level and add fluid as needed.
- Use the manufacturer’s recommended type of transmission fluid.
Prevention and Maintenance
To prevent future transmission fluid leaks, follow these tips:
- Regularly check the transmission fluid level and add fluid as needed.
- Inspect the transmission and surrounding areas for signs of leaks.
- Have the transmission serviced according to the manufacturer’s recommendations.
Takeaways: Leaky Transmission No More
By following the steps outlined in this guide, you can successfully fix an automatic transmission fluid leak and restore your transmission to optimal performance. Remember to prioritize safety, identify the source of the leak accurately, and take preventative measures to avoid future problems.
Basics You Wanted To Know
Q: What are the signs of a transmission fluid leak?
A: Red or brown fluid leaking from under the car, slipping gears, or difficulty shifting.
Q: How often should I check the transmission fluid level?
A: Check the fluid level every 30,000 to 60,000 miles or as recommended by your vehicle’s manufacturer.
Q: Can I use any type of transmission fluid?
A: No, always use the manufacturer’s recommended type of transmission fluid. Using the wrong fluid can damage the transmission.
Q: Is it safe to drive with a transmission fluid leak?
A: No, driving with a transmission fluid leak can cause severe damage to the transmission. It’s important to fix the leak as soon as possible.
Q: How much does it cost to fix a transmission fluid leak?
A: The cost of repairing a transmission fluid leak depends on the source of the leak and the severity of the damage. It can range from a few hundred dollars to over a thousand dollars.