How to Compress a Strut Spring: A Comprehensive Guide for DIYers

Strut springs, those coiled metal wonders that keep your car from bottoming out, can sometimes lose their springiness. This can lead to a host of problems, including a bouncy ride, poor handling, and even premature wear on other suspension components. If your strut springs are sagging, you might be tempted to replace them, but before you break out the wrench, consider compression. Compressing strut springs can be a safe and effective way to restore their original length and firmness, potentially saving you a bundle on new parts. This comprehensive guide will walk you through the process, explaining the tools you'll need, the safety precautions to take, and the steps involved.

Why Compress Strut Springs?

While strut spring compression isn't a common DIY project, it's a valuable skill to have in your toolbox. Here's why you might consider it:

• Restore Springiness: As strut springs age, they can lose their ability to absorb shock and provide a smooth ride. Compression can help restore their original length, improving the car's handling and comfort.
• Pre-Installation: If you're replacing a worn-out strut assembly, compressing the spring beforehand can make installation much easier and safer.
• Cost Savings: Replacing a strut assembly can be expensive. Compression can be a more affordable option to breathe new life into your suspension system.

Safety First: Understanding the Risks

Before you even think about touching a strut spring, understand that these coiled steel monsters are under immense tension. If mishandled, they can release this stored energy violently, causing serious injury. Here's what you need to know:

• Extreme Force: Compressed springs store a significant amount of potential energy. A sudden release can launch them with tremendous force, capable of causing serious harm.
• Unpredictable Behavior: Even a slight miscalculation or a tool failure can lead to the spring suddenly releasing, potentially causing injury or damage.
• Proper Equipment: Compressing springs requires specialized tools designed to handle the immense force involved. Using inappropriate tools is extremely dangerous.

Tools of the Trade: What You'll Need

Don't attempt to compress a strut spring without the right tools. Here's what you'll need to get started:

• Strut Spring Compressor: This is the most crucial tool. Look for a quality compressor designed specifically for strut springs, not just general-purpose spring compressors. These usually come with two sets of arms that grip the spring securely.
• Hydraulic Jack: You'll need a sturdy jack to lift the car and provide a stable platform for working on the suspension.
• Jack Stands: Never rely solely on the jack to support the car. Use sturdy jack stands to provide additional support and ensure safety.
• Torque Wrench: Once you've reassembled the strut assembly, use a torque wrench to ensure the nuts and bolts are tightened to the correct specifications.
• Safety Glasses: Protect your eyes from flying debris during the compression process.
• Gloves: Wear heavy-duty gloves to protect your hands from sharp spring edges.

Step-by-Step Guide to Compressing a Strut Spring

Now, let's dive into the actual compression process. Remember: Safety is paramount. If you're not comfortable with the task, consult a professional mechanic.

1. Prepare the Workspace: Find a level, firm surface to work on. Make sure you have ample space around the vehicle for tools and movement.
2. Secure the Vehicle: Engage the parking brake and chock the rear wheels to prevent accidental movement. Then, use the jack to lift the vehicle, supporting it securely with jack stands.
3. Remove the Strut Assembly: Before tackling the spring, remove the strut assembly from the vehicle. This may involve disconnecting the shock absorber, removing any cotter pins, and loosening bolts. Consult your vehicle's repair manual for specific instructions.
4. Compress the Spring: Now comes the critical part. Carefully position the strut spring compressor around the spring. Engage the compressor's arms, applying even pressure to compress the spring slowly and evenly. Don't force it! If the spring is too tight, use a pry bar or similar tool to help the compressor arms engage properly. Always check that the compressor is securely in place before applying further pressure.
5. Monitor for Problems: During compression, watch closely for any signs of binding, slipping, or other issues. If the compressor is struggling or the spring doesn't compress smoothly, stop immediately and investigate. Never force a spring to compress, as it could release suddenly.
6. Remove the Old Spring: Once the spring is sufficiently compressed, you can safely remove it from the strut assembly. Be mindful of the stored energy in the compressed spring and handle it with extreme caution.
7. Install the New Spring: If you're replacing the spring, carefully install the new one. Ensure it's properly seated on the strut assembly and that the compressor is still securely in place.
8. Slowly Release the Compression: Release the pressure on the compressor slowly and evenly. As the spring expands, ensure the compressor arms stay securely engaged to control the release of stored energy. Never let the compressor arms release suddenly.
9. Reassemble the Strut Assembly: Once the spring is fully extended, reassemble the strut assembly, following your vehicle's repair manual for torque specifications.
10. Lower the Vehicle: Lower the vehicle carefully, using the jack to release the pressure slowly and evenly. Inspect everything before driving to ensure that all components are properly secured.
11. Test Drive: Once the vehicle is safely on the ground, test drive it to ensure everything is working correctly. Check for any unusual noises or vibrations.

Closing Thoughts: When to Seek Professional Help

While compressing strut springs can be a worthwhile DIY project for the mechanically inclined, it's important to recognize the inherent risks. If you're uncomfortable with the process, have limited experience with car repairs, or lack the proper tools, don't hesitate to seek professional assistance. A qualified mechanic can perform the job safely and ensure that your suspension is properly repaired. Remember, safety should always be your top priority.

Compressing strut springs is a potentially dangerous task that demands caution and the right tools. If done correctly, it can be a cost-effective way to restore your car's suspension to optimal performance. Always prioritize safety and never attempt to compress a spring without proper knowledge, tools, and experience. If in doubt, consult a professional mechanic.