The tailgate struts (also known as tailgate lift supports or gas springs) in the Mercedes-Benz G-Class W465 are hydraulic components that support and assist in the opening and closing of the rear tailgate. These struts are essential for helping to lift and hold the tailgate in place when it is opened, and they also control the smooth movement of the tailgate when it is being closed.

Functions of Tailgate Struts:

1. Supporting the Tailgate:
   • The primary function of the tailgate struts is to assist in opening and hold the tailgate in the open position. They provide lifting force when the tailgate is raised and prevent the tailgate from falling down once it is open.
2. Smooth Opening and Closing:
   • Tailgate struts provide controlled movement when opening and closing the tailgate. They dampen the movement to ensure that the tailgate opens smoothly and closes gently, preventing any sudden slamming or jerking motions.
3. Preventing Damage:
   • By supporting the weight of the tailgate and controlling its motion, the struts help to prevent excessive stress on the hinges and other components, which can lead to damage over time.

Symptoms of Faulty Tailgate Struts:

If the tailgate struts in your G-Class W465 are worn out or malfunctioning, there are a few signs to look out for:

1. Tailgate Falling Down:
   • One of the most common symptoms of a faulty tailgate strut is when the tailgate no longer stays up on its own. If the struts are damaged or lose their gas charge, the tailgate may start to fall, even if it was previously staying open.
2. Slow or Jerky Tailgate Movement:
   • If the struts are weak or worn out, the tailgate may open or close slower than usual or exhibit jerky movements. This is often due to a lack of sufficient pressure within the struts, which are no longer able to provide the required support.
3. Strut Leaks:
   • If there are oil stains or visible signs of leakage around the struts, it's an indication that the gas or hydraulic fluid inside has leaked out, rendering the strut ineffective. This will require a replacement.
4. Difficulty Opening or Closing the Tailgate:
   • If it becomes more difficult to raise or lower the tailgate, the struts may not be providing enough assistance to lift the tailgate or dampen its movement during closing.

Common Causes of Faulty Tailgate Struts:

1. Wear and Tear:
   • Over time, tailgate struts naturally lose pressure and efficiency. This is due to normal usage, especially in climates with extreme temperatures, which can cause the gas inside the struts to deteriorate.
2. Exposure to Harsh Elements:
   • The struts are located on the exterior of the vehicle, making them vulnerable to weather conditions. Exposure to rain, snow, or extreme heat can accelerate wear and tear, causing seals to fail or the gas to leak out.
3. Gas Leak:
   • The struts are filled with gas that provides the lifting force. If there is a leak in the gas chamber, the strut will lose its ability to assist with lifting or supporting the tailgate. This can result from a puncture or degradation of the seals over time.
4. Physical Damage:
   • If the tailgate is subjected to a heavy impact or an accident, it can damage the struts. This can lead to loss of functionality or complete failure of the strut.

Replacing Tailgate Struts:

If the tailgate struts in the G-Class W465 are not functioning properly, they will need to be replaced. Here’s an overview of the replacement process:

Tools and Materials:

• Replacement tailgate struts (make sure they are compatible with your vehicle model)
• Screwdriver (flathead and Phillips)
• Socket wrench set
• Pry tool (optional)
• Lubricant (optional, for ease of installation)

Step-by-Step Process:

1. Preparation:
   • Before beginning the replacement, ensure that the vehicle is turned off, and it's a good idea to disconnect the battery for safety. Having an assistant hold the tailgate open during the replacement is recommended, as the old struts may be weak and could cause the tailgate to fall.
2. Locate the Old Tailgate Struts:
   • The tailgate struts are mounted on both sides of the tailgate, connecting the tailgate to the vehicle’s body. They are typically attached with bolts or pins.
3. Remove the Old Struts:
   • Use a socket wrench or screwdriver to remove the bolts or pins securing the old struts. You may need to use a pry tool to carefully detach the strut from its mounting points.
   • Take care not to damage the tailgate or other components while removing the old struts.
4. Install the New Tailgate Struts:
   • Position the new struts in place and secure them by attaching the bolts or pins. Ensure that the struts are mounted properly and are aligned correctly for optimal operation.
   • If necessary, apply a bit of lubricant to the mounting points to make installation easier.
5. Test the Tailgate:
   • After the new struts are installed, carefully test the tailgate by opening and closing it. Make sure the tailgate stays up when open and closes smoothly without excessive force or jerking.
   • Ensure that the tailgate moves freely and is supported properly by the new struts.
6. Reassemble the Vehicle:
   • Once the struts are installed and tested, reassemble any trim or components that were removed to access the struts.

Professional Repair:

If you’re not comfortable performing the replacement yourself, you can have a professional mechanic or auto repair shop handle the installation of the new tailgate struts. This is generally a straightforward replacement, but a professional will ensure the job is done quickly and correctly.

Conclusion:

The tailgate struts in the Mercedes-Benz G-Class W465 are essential for supporting and assisting in the opening and closing of the rear tailgate. Over time, they can wear out, leak gas, or suffer damage, leading to symptoms such as the tailgate failing to stay up, slow or jerky movement, or difficulty opening/closing the tailgate. If you experience any of these issues, it is likely time to replace the struts. Replacing them involves removing the old struts, installing the new ones, and testing the tailgate to ensure proper operation.