The Ultimate Guide to E90 Rear Gas Struts
The E90 BMW 3 Series, produced between 2006 and 2011, is known for its excellent handling and luxury features. However, like any vehicle, its components can wear out over time, particularly the rear gas struts. These vital components support the tailgate, ensuring it opens and closes smoothly. In this guide, we will explore everything you need to know about E90 rear gas struts, including types, applications, and key features.
Comparison of E90 Rear Gas Struts
| Type of Gas Strut | Application | Compatibility | Average Lifespan | Price Range |
|---|---|---|---|---|
| OEM Gas Struts | Original replacement | E90 3 Series | 5-7 years | $100 – $150 each |
| Aftermarket Gas Struts | Cost-effective alternative | E90 3 Series | 3-5 years | $50 – $100 each |
| Heavy-Duty Gas Struts | Enhanced performance and durability | E90 3 Series | 7-10 years | $150 – $200 each |
| Adjustable Gas Struts | Customizable lift force | E90 3 Series | 5-8 years | $120 – $180 each |
Understanding Gas Struts
Gas struts, also known as gas springs or lift supports, are hydraulic devices that utilize compressed gas to support and lift heavy components like a vehicle’s tailgate. When the gas charge diminishes over time, the strut may fail to support the weight, leading to difficulty in opening or closing the tailgate. Understanding the function of gas struts is essential for maintaining the usability and safety of your E90.
How Do Gas Struts Work?
Gas struts operate using a sealed cylinder filled with gas (often nitrogen) and a piston. When the tailgate is opened, the gas pushes against the piston, allowing the strut to extend. Conversely, when closing, the weight of the tailgate compresses the gas, allowing for a controlled descent. This mechanism ensures that the tailgate opens effortlessly and closes gently, preventing slamming.
Types of E90 Rear Gas Struts
There are several types of gas struts available for the E90, each with unique characteristics suited for different needs.
OEM Gas Struts
OEM (Original Equipment Manufacturer) gas struts are designed specifically for BMW vehicles. They are typically more expensive but offer a perfect fit and performance, making them a reliable choice for those looking to maintain the original specifications of their E90.
Aftermarket Gas Struts
Aftermarket options are often more affordable and can provide satisfactory performance. While they may not match OEM struts in quality, many reputable brands offer durable alternatives that can serve well for several years.
Heavy-Duty Gas Struts
For those who frequently use their E90 for heavy loads, heavy-duty gas struts provide enhanced support and durability. These struts can handle more weight and are ideal for individuals who want to maximize their vehicle’s utility.
Adjustable Gas Struts
Adjustable gas struts allow users to customize the lift force according to their needs. This flexibility is beneficial for those who require specific weight support or frequently change their load capacity.
Installation of E90 Rear Gas Struts
Replacing rear gas struts in an E90 can be a straightforward process if done correctly. Here’s a step-by-step guide to help you through the installation.
Tools Required
- Socket wrench set
- Flathead screwdriver
- Torque wrench
- Safety goggles
Step-by-Step Installation
- Safety First: Ensure the vehicle is parked on a flat surface, and engage the parking brake.
- Remove the Old Struts: Use a socket wrench to remove the bolts securing the old struts. A flathead screwdriver may be helpful to pry off any retaining clips.
- Install New Struts: Position the new gas struts into place and secure them with the bolts. Ensure the struts are aligned correctly.
- Test the Function: Gently open and close the tailgate to ensure the new struts function smoothly.
- Final Check: Re-tighten all bolts to the manufacturer’s specifications using a torque wrench.
Maintenance Tips for Gas Struts
Proper maintenance can extend the life of your E90 rear gas struts. Here are some useful tips:
- Regular Inspections: Check for any signs of wear, such as oil leaks or difficulty in lifting the tailgate.
- Clean the Struts: Keep the struts clean from dirt and debris to prevent corrosion.
- Avoid Overloading: Do not exceed the strut’s weight capacity, as this can cause premature failure.
Technical Features of E90 Rear Gas Struts
| Feature | OEM Gas Struts | Aftermarket Gas Struts | Heavy-Duty Gas Struts | Adjustable Gas Struts |
|---|---|---|---|---|
| Pressure Rating | 270-350 N | 200-300 N | 350-500 N | Variable |
| Cylinder Diameter | 14 mm | 12-14 mm | 15 mm | 14-16 mm |
| Length (Extended) | 580 mm | 570-590 mm | 600 mm | 580-600 mm |
| Warranty | 2 years | 1 year | 3 years | 2 years |
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Conclusion
In summary, E90 rear gas struts are crucial for the functionality and safety of your BMW 3 Series. Understanding the types, installation process, and maintenance tips can help you make informed decisions when replacing these components. Whether you opt for OEM, aftermarket, heavy-duty, or adjustable struts, ensuring proper care will extend their lifespan and enhance your driving experience.
FAQ
What are the symptoms of a failing gas strut?
A failing gas strut may exhibit symptoms such as difficulty opening or closing the tailgate, visible wear or damage, or a noticeable drop in lift support.
How often should I replace my gas struts?
Typically, gas struts should be replaced every 5-7 years, but this may vary based on usage and conditions.
Can I replace one gas strut or should I replace both?
It is recommended to replace both gas struts simultaneously to ensure balanced support and performance.
What tools do I need to replace gas struts?
You will need a socket wrench set, flathead screwdriver, torque wrench, and safety goggles.
Where can I buy E90 rear gas struts?
E90 rear gas struts can be purchased from various online retailers, including www.e90post.com, gastac.com, and www.turnermotorsport.com.
Do aftermarket gas struts perform as well as OEM?
While many aftermarket options offer satisfactory performance, they may not match the quality and fitment of OEM struts.
How can I extend the life of my gas struts?
Regular inspections, keeping them clean, and avoiding overloading can help extend the life of gas struts.
What is the pressure rating of E90 gas struts?
The pressure rating typically ranges from 200 to 350 N for aftermarket struts, while OEM struts can go up to 350 N or more.
Are adjustable gas struts worth it?
Adjustable gas struts are beneficial for users who require specific lift capabilities and want flexibility based on varying loads.
Can I install gas struts myself?
Yes, with the proper tools and instructions, installing gas struts can be a DIY task suitable for most car owners.
