Replacing a Throw Out Bearing: A Comprehensive Guide

Introduction

A throw out bearing is a crucial component in the manual transmission system of a vehicle. Its primary function is to disengage the clutch, allowing the driver to shift gears smoothly. Over time, throw out bearings can wear out and need replacement. This article provides a comprehensive guide to changing a throw out bearing, including step-by-step instructions, common mistakes to avoid, pros and cons, and frequently asked questions.

What is a Throw Out Bearing?

A throw out bearing is a small, cylindrical bearing that is located between the clutch fork and the pressure plate. When the clutch pedal is depressed, the throw out bearing moves forward and pushes against the pressure plate, releasing the pressure on the clutch disc and allowing the gears to disengage.

Symptoms of a Failing Throw Out Bearing

• Noisy Clutch: A worn-out throw out bearing can produce a squealing or grinding noise when the clutch pedal is depressed.
• Difficult Gear Shifting: A failing throw out bearing can make it difficult to shift gears smoothly, especially when the vehicle is in motion.
• Clutch Slippage: A worn-out throw out bearing can cause the clutch to slip, resulting in a loss of power or difficulty accelerating.

When to Replace a Throw Out Bearing

It is generally recommended to replace a throw out bearing when it shows signs of failure or as part of a clutch replacement. The average lifespan of a throw out bearing is around 60,000 to 100,000 miles.

Tools and Materials Required

• Jack and Jack Stands
• Socket Wrench Set
• Transmission Jack or Support
• Clutch Alignment Tool
• New Throw Out Bearing
• Clutch Kit (if necessary)

Step-by-Step Instructions for Changing a Throw Out Bearing

1. Safety Precautions

• Park the vehicle on a level surface and engage the parking brake.
• Allow the engine to cool down completely.
• Disconnect the negative battery terminal.

2. Remove the Transmission

• Raise the vehicle using a jack and secure it on jack stands.
• Remove the transmission mount bolts and disconnect the transmission from the engine.
• Lower the transmission and support it with a transmission jack or support.

3. Remove the Clutch

• Remove the clutch cover bolts and lift off the clutch cover.
• Remove the clutch disc and pressure plate.

4. Inspect the Throw Out Bearing

• Inspect the throw out bearing for signs of wear or damage.
• Replace the throw out bearing if it is worn, damaged, or noisy.

5. Install the Throw Out Bearing

• Lubricate the new throw out bearing with a high-temperature grease.
• Install the throw out bearing onto the clutch fork.

6. Install the Clutch

• Install the pressure plate and clutch disc.
• Align the clutch using a clutch alignment tool.
• Tighten the clutch cover bolts to the specified torque.

7. Install the Transmission

• Lift the transmission and align it with the engine.
• Install the transmission mount bolts and tighten them to the specified torque.
• Reconnect the transmission to the engine.

8. Bleed the Clutch

• Bleed the clutch to remove any air from the hydraulic system.

9. Reinstall the Battery

• Reconnect the negative battery terminal.

Common Mistakes to Avoid

• Using the wrong type of grease: Use only high-temperature grease designed for throw out bearings.
• Overtightening the clutch bolts: This can damage the clutch and pressure plate.
• Failing to lubricate the throw out bearing: A dry throw out bearing can wear out prematurely.
• Not bleeding the clutch: Trapped air in the hydraulic system can lead to clutch problems.

Pros and Cons of Changing a Throw Out Bearing

Pros

• Improves clutch performance
• Prevents costly transmission damage
• Relatively straightforward repair for experienced mechanics

Cons

• Requires removing the transmission
• Can be time-consuming and labor-intensive
• May require additional parts, such as a clutch kit

FAQs

1. Can I change a throw out bearing without removing the transmission?

In some cases, it is possible to change a throw out bearing without removing the transmission. However, this requires specialized tools and can be difficult for inexperienced mechanics.

2. How much does it cost to replace a throw out bearing?

The cost to replace a throw out bearing varies depending on the vehicle make and model. On average, the parts and labor can range from $200 to $600.

3. How long does it take to replace a throw out bearing?

Replacing a throw out bearing typically takes 4-8 hours, depending on the mechanic's experience and the vehicle.

4. Can I drive with a worn-out throw out bearing?

Driving with a worn-out throw out bearing is not recommended. It can lead to further damage to the clutch and transmission.

5. How often should I replace my throw out bearing?

The throw out bearing should be replaced when it shows signs of failure or as part of a clutch replacement. The average lifespan of a throw out bearing is around 60,000 to 100,000 miles.

6. What are other signs of a worn-out clutch?

Other signs of a worn-out clutch include:

• Clutch chatter
• Burning smell
• Difficulty engaging gears

Conclusion

Replacing a throw out bearing is a necessary repair when it shows signs of failure. By following the instructions in this guide and avoiding common mistakes, you can successfully complete this task and restore the proper functioning of your vehicle's clutch. If you are not comfortable performing this repair yourself, it is recommended to consult a qualified mechanic.

Call to Action

If you are experiencing any of the symptoms mentioned in this article, we recommend having your vehicle inspected by a qualified mechanic as soon as possible. Ignoring these symptoms can lead to costly repairs and damage to your vehicle's transmission.