For Mercedes Benz W124 Cabriolet owners, the allure of open-top driving is undeniable. However, the complex hydraulic systems that operate these convertible tops can become a source of frustration when malfunctions occur. This guide outlines a simplified approach to manually operate your Mercedes Benz W124 Convertible top, offering a temporary solution for enthusiasts who prefer a hands-on approach. Please note that this method is intended as a temporary fix and involves inherent risks. Proceed with caution and prioritize safety.
Understanding the Challenge: Hydraulic Convertible Top Systems
The original Mercedes Benz W124 convertible top relies on an intricate network of hydraulic cylinders, lines, and a control unit. When these systems fail – often due to age, leaks, or electrical issues – the top can become inoperable, leading to costly repairs. Many owners face expensive quotes for replacement parts, sometimes leading them to consider alternative solutions. This manual conversion aims to bypass the faulty hydraulic system, allowing you to enjoy your W124 convertible while exploring repair options.
Manual Conversion: Step-by-Step Guide
This method focuses on enabling manual operation by addressing key components of the convertible top mechanism. It’s based on the experience of an owner who encountered a non-functional top and opted for a DIY approach.
1. Roll Bar Assembly and Spring Removal:
The roll bar in the Mercedes Benz W124 convertible is designed for safety, deploying automatically in a rollover situation. It also integrates with the rear seat and convertible top mechanism. To facilitate manual operation, the large springs within the roll bar assembly need to be removed.
Accessing the Roll Bar Springs: With the roll bar in the extended (up) position, carefully remove the end mount screws using a Torx bit. Crucially, ensure the roll bar is extended before attempting this. Attempting spring removal when the roll bar is in the “cocked” or retracted position can release significant spring tension, posing a safety risk.
Spring Removal: Once the end mount screws are removed, you can extract the large springs from inside the square tubing of the roll bar assembly. Removing these springs renders the roll bar non-functional in terms of automatic deployment, but allows it to be positioned in the down position permanently, which is necessary for manual top operation and to reinstall the rear seats correctly.
Important Safety Note: Removing the roll bar springs compromises the vehicle’s rollover protection system. This modification should be considered carefully, and the reduced safety should be understood.
2. Top Stowage Area Release:
The convertible top stowage area, located behind the rear seats, needs to be accessible for manual operation. The release mechanism is typically hydraulically operated.
Manual Release: Locate the 11mm wrench access point behind the rear seat back. Using an 11mm wrench, you can manually release the top stowage compartment. This allows you to lift and lower the convertible top manually.
Rear Latch Consideration: The original rear latch, which secures the glass window section to the deck lid, is also hydraulically operated. In some cases, like the example car, this may have been removed by a previous owner. For manual operation, consider a manual release mechanism for this latch, possibly adapted from a cable-operated system like an old choke cable, to ensure the rear window section is properly secured when the top is closed.
3. Manual Top Operation and Practical Considerations:
With the roll bar springs removed and the stowage area manually accessible, you can now manually raise and lower the Mercedes Benz W124 convertible top.
Physical Effort: Be aware that manually operating the top requires significant physical effort. As noted in the original experience, it may be manageable for a larger person but could be challenging for someone smaller.
Tonneau Cover Prop Rod (Optional): Consider fashioning a prop rod to hold up the tonneau cover while operating the top. This frees up both hands to manage the weight and movement of the convertible top itself.
Window Operation: Always ensure all windows are fully rolled down before attempting to move the convertible top, either up or down. This reduces stress on the top mechanism and prevents potential damage.
Safety and Further Actions
Operating your W124 convertible with a manually converted top involves inherent safety considerations:
- Compromised Roll-Over Protection: Disabling the roll bar’s automatic function significantly reduces rollover safety. The windshield frame is designed for strength, but it’s not a replacement for a functional roll bar system.
- Manual Handling Risks: Manually operating the heavy convertible top can pose ergonomic risks. Be cautious to avoid strains or injuries.
Moving Forward: Repair or Manual Roll Bar Control
This manual conversion is a workaround, not a permanent solution. Ideally, restoring the original hydraulic system or implementing a manual control for the roll bar should be considered.
- Hydraulic System Repair: Investigating the hydraulic system for leaks, damaged lines, or a faulty control unit is recommended for a full restoration of the Mercedes Benz W124 convertible top’s original functionality. However, this can be complex and expensive.
- Manual Roll Bar Control: Exploring the possibility of adapting the roll bar controller to manual operation (e.g., using a momentary switch for up/down) could restore some level of roll bar functionality while maintaining manual top operation. This would require technical expertise and careful wiring modifications.
Conclusion: Embracing the Cabriolet Spirit
Converting your Mercedes Benz W124 convertible top to manual operation is a testament to resourcefulness and the desire to keep these classic cars on the road. While it involves trade-offs and requires a degree of physical effort, it allows owners to continue enjoying the open-air experience that makes the W124 Cabriolet so appealing. It’s a solution for those who appreciate a hands-on approach and are willing to engage with their vehicle on a deeper level, even if it means a bit of extra effort to lower the top on a sunny day.
