Understanding Non-Bearing Strut Mounts

When discussing vehicle suspension, the strut mount often plays a supporting, yet vital, role that many drivers overlook. While the focus frequently lands on shocks and struts themselves, the strut mount acts as the critical intermediary between your vehicle's suspension and its main body. If you've been experiencing unusual noises, persistent vibrations, or a noticeable decline in handling, a worn upper strut mount could very well be the underlying issue. This comprehensive guide aims to demystify strut mounts, covering their fundamental purpose, the process of replacement, and essential maintenance considerations. Whether you consider yourself a seasoned car enthusiast or simply someone who values a dependable and comfortable driving experience, this article is designed to equip you with all the necessary knowledge regarding these often-unseen components.

What Exactly is a Strut Mount?

At its core, a strut mount is a pivotal component designed to connect a vehicle's strut—which is a type of shock absorber—directly to the car's chassis or body. Its dual purpose is to serve as a secure mounting point while simultaneously acting as an insulator against common road-induced vibrations and noise. Typically situated at the very top of the strut assembly, the upper strut mount is responsible for anchoring the strut firmly in place. Crucially, for front suspensions, it also facilitates the necessary pivoting action required for steering, allowing the entire strut assembly to turn in sync with the steering wheel.

Key Functions of a Strut Mount

The importance of a strut mount is best understood by examining its core functions:

Broadly speaking, strut mounts can be categorised into two primary types, distinguished by their intended application and functionality:

• Non-Bearing Strut Mounts: These are most commonly found in rear suspension systems. Their primary role is to provide essential structural support and cushioning, absorbing impacts without the need to facilitate steering rotation.
• Bearing Strut Mounts: Typically located in front suspensions, these mounts incorporate a bearing mechanism. This bearing is crucial for allowing the strut assembly to pivot smoothly when the driver turns the steering wheel, while also managing vertical loads.

Identifying Signs of a Failing Strut Mount

An ageing or worn-out strut mount can significantly compromise both the safety and comfort of your vehicle's ride. It's important to be aware of the common indicators that suggest your upper strut mount might be nearing the end of its service life. These symptoms often manifest as:

• Audible Clunks or Knocks: You might hear distinct clunking or knocking sounds, particularly when driving over bumps, potholes, or uneven road surfaces.
• Increased Steering Wheel Vibration: A noticeable increase in vibration felt through the steering wheel, especially at certain speeds or during turns, can signal a worn mount.
• Wheel Alignment Issues: If your wheels appear to be misaligned, or if you notice a pattern of uneven tyre wear (such as wear on only one edge of the tyre), a faulty strut mount could be the cause.
• Compromised Handling: A deterioration in handling, such as a feeling of instability, vagueness, or excessive body roll during turns, points towards suspension issues, potentially including the strut mount.
• Visible Damage: In some cases, you might be able to visually inspect the strut mount (often through the wheel well or by removing the wheel) and notice signs of physical degradation, such as cracked or perished rubber, or evidence of rust on metal components.

Should you observe any of these symptoms, it is highly advisable to arrange for an inspection of your strut mounts. If they are found to be worn or damaged, prompt replacement is essential for restoring optimal suspension performance and ensuring vehicle safety.

The Process of Changing a Strut Mount

Replacing a strut mount involves a series of steps that require careful execution. Generally, this process entails removing the entire strut assembly from the vehicle, carefully disassembling it to gain access to the mount, and then installing the new component. While this task can be undertaken as a DIY project by those with the appropriate tools and a good understanding of automotive mechanics, it's crucial to acknowledge the inherent dangers. The high tension stored within the coil spring necessitates specialised equipment, like a spring compressor, to prevent serious injury.

Essential Tools and Materials for Replacement

To successfully change a strut mount, you will typically need the following:

• Vehicle jack and a set of sturdy jack stands
• A comprehensive socket set with various sizes
• A reliable spring compressor (crucial for safety)
• A torque wrench for precise tightening
• Penetrating oil, especially if dealing with rusted bolts
• A new, compatible strut mount

Step-by-Step Guide: How to Change a Strut Mount

1. Vehicle Preparation: Ensure the vehicle is parked on a flat, stable surface and engage the parking brake firmly. Before lifting the vehicle, slightly loosen the lug nuts on the wheel you'll be working on. Use the jack to raise the car and immediately secure it with jack stands for safety.
2. Wheel Removal: Completely remove the lug nuts and take off the wheel. This will grant you access to the strut and strut mount assembly.
3. Strut Assembly Detachment: Locate the bolts that secure the bottom of the strut to the steering knuckle and remove them. Carefully disconnect any brake lines or ABS wiring harnesses that are attached to the strut body. Proceed to the engine bay, open the bonnet, and identify the bolts securing the upper strut mount to the strut tower. Support the strut assembly from below as you remove these top bolts.
4. Spring Compression: Before you can safely remove the strut mount, you must compress the coil spring. Use a spring compressor, ensuring it is properly seated on both sides of the spring. Apply pressure slowly and evenly to both sides of the spring to prevent it from suddenly releasing or becoming unstable.
5. Strut Mount Removal and Replacement: With the spring safely compressed, you can now remove the central nut that holds the upper strut mount onto the strut shaft. Carefully lift off the old strut mount. Position the new strut mount, ensuring it is correctly oriented, and then reinstall the securing nut onto the strut shaft. Slowly and carefully release the tension from the spring compressor, allowing the spring to seat properly against the new mount.
6. Reassembly of the Strut Assembly: With the new strut mount in place and the spring decompressed, reinstall the entire strut assembly back into its position within the vehicle. Secure the top of the strut assembly to the strut tower by replacing and tightening the mounting bolts.
7. Final Reattachment and Torque: Bolt the bottom of the strut back to the steering knuckle, reconnecting any lines or sensors that were previously detached. It is critical to torque all bolts to the manufacturer's specified values using a torque wrench. Reinstall the wheel, tighten the lug nuts, and lower the vehicle.

Strut Mount Replacement: Professional vs. DIY

While undertaking the replacement of strut mounts yourself can offer significant cost savings and a sense of accomplishment, hiring a professional mechanic is often the safer and more reliable option. Professionals possess the specialised tools, experience, and knowledge to ensure the job is done correctly and safely, often including a wheel alignment check, which is highly recommended after suspension work.

Estimated Costs for Strut Mount Replacement

The cost associated with replacing strut mounts can fluctuate considerably, depending on factors such as your vehicle's make and model, local labour rates, and whether any other suspension components are replaced concurrently. As a general guideline:

Please note that these are approximate figures, and actual prices can vary significantly. It is always best to obtain quotes from local mechanics or consult with reputable parts suppliers for accurate pricing and to ensure you source high-quality components.

Advantages of Replacing Worn Strut Mounts

Opting to replace worn strut mounts offers several tangible benefits that directly contribute to a better driving experience and improved vehicle health:

• Enhanced Ride Quality: A new strut mount will effectively dampen road noise and vibrations, leading to a noticeably smoother and quieter ride.
• Improved Steering Precision: By restoring proper function, you'll experience more responsive and accurate steering, making the vehicle feel more connected to the road.
• Correct Wheel Alignment: Replacing faulty mounts helps maintain correct suspension geometry, preventing issues like uneven tyre wear and improving directional stability.
• Extended Component Lifespan: Properly functioning strut mounts reduce unnecessary stress on other suspension parts, potentially extending their lifespan and reducing future repair costs.
• Increased Safety: Improved handling and stability, particularly during cornering and braking, contribute significantly to overall vehicle safety.

Strut Mount Replacement: A Summary

Frequently Asked Questions (FAQ)

Q1: What is a strut mount and what does it do?

A strut mount is the component that connects a vehicle's strut to the car's body. It serves to absorb road noise and vibrations, and critically, allows the strut assembly to pivot during steering in front suspensions.

Q2: How do I change a strut mount?

The process involves safely removing the strut assembly from the vehicle, compressing the coil spring using a spring compressor, replacing the old strut mount with a new one, and then reassembling the strut and reinstalling it. Caution is paramount due to the stored energy in the spring.

Q3: Can I replace a strut mount without a spring compressor?

No, attempting to replace a strut mount without a spring compressor is extremely dangerous and strongly discouraged. The coil spring under compression holds a significant amount of potential energy, and its uncontrolled release can cause severe injury.

Q4: How long do strut mounts typically last?

The lifespan of strut mounts generally ranges from 50,000 to 100,000 miles. However, this can be influenced by driving habits, the quality of the roads you typically drive on, and the overall maintenance of the suspension system. They are often replaced proactively when changing the struts themselves.

Q5: Should I replace both strut mounts at the same time?

Yes, it is highly recommended to replace strut mounts in pairs (both front mounts or both rear mounts simultaneously). This ensures consistent performance and even wear across the suspension system, leading to better handling and longevity.

Q6: Can faulty strut mounts cause uneven tyre wear?

Absolutely. A failing strut mount can lead to misalignment of the suspension geometry, which directly results in uneven tyre wear and can also negatively impact steering control and vehicle stability.

Conclusion

While the strut mount may be a relatively small component within your vehicle's complex suspension system, its responsibilities are substantial. From stabilising your ride and isolating your cabin from jarring vibrations to ensuring precise steering control, the condition of your strut mounts directly impacts your overall driving experience and safety. By understanding what a strut mount is and recognising the signs of wear, you are better equipped to make informed decisions about your vehicle's maintenance. When the time comes for a replacement, always prioritise quality components to ensure optimal performance and durability.

Keywords: strut mount, non-bearing strut mount, strut and strut mount, suspension maintenance, vehicle safety, ride quality, steering performance.