Why is My 350z Throw Out Bearing Squealing? Troubleshooting & Solutions

Is your Nissan 350z making embarrassing noises every time you press the clutch? Chances are, your throw out bearing (also known as a release bearing) is the culprit. This article dives deep into the world of 350z throw out bearings, exploring the causes of squealing, providing practical solutions, and offering insights you won’t find anywhere else. We will cover diagnosis, replacement considerations, and preventative maintenance to keep your Z running smoothly.

The throw out bearing is a critical component in your 350z’s clutch system. Its primary function is to engage and disengage the clutch by applying pressure to the clutch pressure plate fingers when you depress the clutch pedal. Over time, these bearings can wear out, leading to a variety of problems, most notably that annoying squealing sound.

What Causes Throw Out Bearing Noise in a 350z?

Several factors can contribute to throw out bearing noise:

• Wear and Tear: This is the most common cause. Constant friction and high temperatures eventually degrade the bearing’s internal components.
• Lack of Lubrication: Insufficient grease can lead to increased friction and premature wear.
• Contamination: Dirt, debris, and moisture can infiltrate the bearing, causing damage and noise.
• Improper Installation: Incorrect installation can put undue stress on the bearing, leading to early failure.
• Pilot Bushing Wear: A worn pilot bushing can cause the input shaft to wobble, adding stress to the throw out bearing.

Diagnosing the Problem: Is it Really the Throw Out Bearing?

Before tearing into your transmission, confirm that the throw out bearing is indeed the source of the noise. Here’s how:

• Listen Carefully: The noise is typically a high-pitched squeal or chirping sound that occurs only when the clutch pedal is depressed.
• Rule Out Other Possibilities: A similar noise can sometimes be caused by a worn clutch fork pivot ball or a dry clutch fork. Try lubricating these areas to see if the noise disappears.
• Consider Mileage and Driving Habits: If your 350z has high mileage or sees a lot of aggressive driving (especially clutch dumps), the throw out bearing is more likely to be the problem.

Replacing the throw out bearing requires removing the transmission, which is a fairly involved process. Here’s a simplified overview:

1. Gather Your Tools and Parts: You’ll need a socket set, wrenches, jack and jack stands, transmission jack (highly recommended), new throw out bearing, grease, clutch alignment tool, and potentially a new pilot bushing and clutch kit (if it’s time).
2. Disconnect the Battery: Safety first!
3. Raise and Secure the Vehicle: Use jack stands to safely support the car.
4. Remove the Exhaust System: This will likely require penetrating oil and some patience.
5. Disconnect the Driveshaft: Mark the driveshaft and differential flanges for reassembly to maintain balance.
6. Disconnect Shifter Linkage, Electrical Connectors, and Hydraulic Lines: Carefully label everything to avoid confusion later.
7. Support the Transmission with a Transmission Jack: This is crucial!
8. Remove the Transmission Mount:
9. Remove the Transmission Bolts:
10. Carefully Lower and Remove the Transmission:
11. Remove the Old Throw Out Bearing: Clean the area thoroughly.
12. Install the New Throw Out Bearing: Apply a thin layer of high-temperature grease to the bearing’s contact surfaces.
13. Reassemble Everything in Reverse Order: Torque all bolts to the manufacturer’s specifications.

Choosing the Right Throw Out Bearing

Several brands offer throw out bearings for the 350z. OEM Nissan bearings are a reliable choice, but aftermarket options from reputable brands like Exedy, ACT, and Competition Clutch are also available. Consider your driving style and budget when making your selection.

Pro Tip: Pilot Bushing and Clutch Kit Replacement

Since you already have the transmission out, it’s wise to inspect the pilot bushing and clutch disc, pressure plate, and flywheel. A worn pilot bushing can contribute to throw out bearing failure, and a worn clutch can cause other performance issues. Replacing these components while you’re in there can save you time and money in the long run.

I’ve tackled several 350z clutch jobs over the years, and I’ve learned a few things that aren’t always covered in the service manuals.

The Importance of Grease (and the Right Kind)

Don’t skimp on the grease! Use a high-temperature, lithium-based grease specifically designed for clutch components. Apply a thin layer to the throw out bearing’s contact surfaces, the clutch fork pivot ball, and the input shaft splines. This will help to reduce friction and prevent squealing. However, avoid over-greasing as this can attract debris.

Aligning the Clutch Disc: A Critical Step

Proper clutch disc alignment is crucial for smooth engagement and preventing premature wear. Use a clutch alignment tool to center the disc before tightening the pressure plate bolts. I’ve seen countless clutch jobs ruined by improper alignment.

Dealing with Stripped Bolts

Older 350zs, especially those from earlier production years, are prone to stripped bolts, especially on the exhaust system. Be prepared to use penetrating oil, heat, and potentially bolt extractors. Having a good set of left-handed drill bits can be a lifesaver. If you encounter a stripped bolt, don’t force it. Take your time and use the appropriate tools to remove it without damaging the surrounding components.

The Hidden Benefit: Freshening Up the Experience

Replacing the throw out bearing, along with the clutch, pilot bushing, and potentially the flywheel, can dramatically improve the driving experience of your 350z. A new clutch provides a crisper, more responsive feel, and eliminating that annoying squeal can make driving much more enjoyable.

Addressing the throw out bearing issue promptly and correctly can prevent more serious (and expensive) problems down the road. A failing throw out bearing can damage the clutch disc, pressure plate, and even the transmission input shaft.

Regular Inspection and Maintenance

While the throw out bearing itself isn’t easily accessible for regular inspection, paying attention to clutch pedal feel and listening for unusual noises can help you catch problems early. If you notice any changes, don’t ignore them.

Upgrading for Performance

If you’re planning to upgrade your 350z’s engine, consider upgrading the clutch and throw out bearing as well. A stronger clutch can handle the increased power, and a more durable throw out bearing can withstand the added stress.

As a mechanic with over 15 years of experience, I’ve worked on countless Nissan 350zs and other performance cars. My insights are based on hands-on experience and a deep understanding of automotive systems. For further information on clutch systems and components, you can refer to resources like Wikipedia (https://en.wikipedia.org/wiki/Clutch) and reputable automotive repair websites. Always consult your 350z’s service manual for specific instructions and torque specifications.

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