Hey guys! Ever felt that weird vibration or heard a clunk when shifting gears in your Peugeot 208? It might be a sign that your upper gearbox mount, also known as the coxim superior cambio, is wearing out. Don't worry, it happens! In this comprehensive guide, we'll walk you through everything you need to know about diagnosing, replacing, and maintaining this crucial component. So, grab your tools, and let's dive in!

Understanding the Upper Gearbox Mount

The upper gearbox mount, or coxim superior cambio in Portuguese, is a vital part of your Peugeot 208's drivetrain. Its primary function is to secure the gearbox to the vehicle's chassis while absorbing vibrations and shocks generated by the engine and transmission. Think of it as a cushion that prevents those vibrations from transferring into the cabin, ensuring a smoother and quieter ride.

Why is it Important?

A faulty or worn-out upper gearbox mount can lead to a range of issues, affecting your driving experience and potentially causing further damage to other components. Here’s why it's crucial to keep this mount in good condition:

• Vibration Reduction: The mount dampens vibrations, preventing them from reaching the cabin and making your ride more comfortable. Without it, you'll feel every rumble and shake. A worn mount means more vibrations.
• Noise Isolation: By absorbing vibrations, the mount reduces noise levels inside the vehicle. A failing mount can cause clunking or thumping sounds, especially when shifting gears or going over bumps. These noises are not only annoying but also indicative of a problem that needs addressing.
• Drivetrain Protection: The mount helps to stabilize the gearbox, preventing excessive movement and stress on other drivetrain components, such as the driveshaft and engine mounts. This stabilization is crucial for the longevity of these parts. A worn mount can lead to increased wear and tear on these components, potentially resulting in costly repairs down the line.
• Enhanced Shifting: A stable gearbox ensures smoother and more precise gear changes. A damaged mount can cause difficulty in shifting gears, making the process less fluid and more cumbersome. This can significantly impact your driving experience and even pose safety concerns if you struggle to shift gears in critical situations.

Signs of a Failing Upper Gearbox Mount

Recognizing the symptoms of a failing coxim superior cambio early can save you from more extensive and expensive repairs. Here are some common signs to watch out for:

1. Excessive Vibrations: One of the first and most noticeable signs is increased vibration felt through the steering wheel, seats, or floor of the car. This vibration is often more pronounced at certain speeds or when the engine is under load. If you start noticing unusual vibrations that weren't there before, it's a good indication that the gearbox mount might be failing.
2. Unusual Noises: Clunking, banging, or thumping sounds coming from the engine compartment, especially when shifting gears or driving over bumps, are strong indicators of a worn mount. These noises occur because the worn mount is no longer effectively absorbing the shocks and vibrations, allowing the gearbox to move and impact other components. Listen carefully for any unusual sounds, particularly when the engine is under stress.
3. Difficulty Shifting Gears: A failing mount can cause the gearbox to move excessively, making it harder to shift gears smoothly. You might experience resistance or grinding when trying to change gears. This difficulty in shifting not only makes driving less enjoyable but can also be a safety concern if you need to quickly change gears in traffic.
4. Visual Inspection: Sometimes, you can visually inspect the mount for signs of damage. Look for cracks, tears, or excessive wear in the rubber or polyurethane material of the mount. If the mount looks deteriorated or damaged, it's likely time for a replacement. You might also notice that the mount is sagging or appears to be deformed.
5. Engine Movement: With the hood open and the engine running, have someone gently rev the engine while you observe the engine's movement. Excessive engine movement or rocking can indicate a problem with the gearbox mount or other engine mounts. This test should be performed carefully and with someone experienced to avoid any accidental damage or injury.

Tools and Materials Needed for Replacement

Before you start the replacement process, make sure you have all the necessary tools and materials. This will save you time and frustration. Here’s a list of what you’ll need:

• New Upper Gearbox Mount: Purchase a high-quality replacement mount specifically designed for your Peugeot 208 model. Ensure it’s from a reputable brand to guarantee durability and performance.
• Socket Set: A set of sockets and wrenches in various sizes will be needed to remove and install the bolts and nuts securing the mount.
• Wrench Set: Wrenches, preferably both open-end and box-end, are essential for loosening and tightening bolts.
• Torque Wrench: A torque wrench is crucial for tightening the bolts to the manufacturer's specified torque. This ensures the mount is securely fastened without being over-tightened.
• Jack and Jack Stands: You’ll need a jack to lift the vehicle and jack stands to safely support it while you work underneath.
• Wheel Chocks: Wheel chocks are important for preventing the vehicle from rolling while it’s lifted.
• Penetrating Oil: Penetrating oil can help loosen any rusted or stuck bolts.
• Gloves: Wear gloves to protect your hands from dirt and grease.
• Safety Glasses: Safety glasses will protect your eyes from debris.
• Pry Bar: A pry bar can be helpful for gently maneuvering the gearbox into the correct position.
• Optional: Impact Wrench: An impact wrench can speed up the removal of stubborn bolts, but it’s not essential.

Step-by-Step Replacement Guide

Okay, let's get down to the nitty-gritty. Here’s a detailed step-by-step guide to replacing the upper gearbox mount on your Peugeot 208. Remember to work safely and take your time!

Step 1: Safety First

• Park your Peugeot 208 on a level surface. Engage the parking brake and use wheel chocks behind the rear wheels to prevent any movement. Your safety is paramount.

Step 2: Lift the Vehicle

• Use a jack to lift the front of the vehicle. Place jack stands securely under the frame rails to support the car. Never work under a vehicle supported only by a jack. This is a critical safety precaution.

Step 3: Locate the Upper Gearbox Mount

• The upper gearbox mount is typically located on top of the gearbox, near the engine. It connects the gearbox to the vehicle's chassis. Take a good look at its position to understand how it’s attached.

Step 4: Remove the Airbox (If Necessary)

• In some Peugeot 208 models, the airbox might obstruct access to the gearbox mount. If so, carefully remove the airbox by disconnecting any hoses and electrical connectors, then unfastening the mounting bolts or clips.

Step 5: Support the Gearbox

• Before removing the mount, support the gearbox with a jack or a support stand. This will prevent the gearbox from dropping when the mount is removed. Position the jack under the gearbox and gently lift it until it's supporting the weight.

Step 6: Remove the Old Mount

• Use your socket and wrench set to remove the bolts securing the upper gearbox mount. You might need to use penetrating oil if the bolts are rusted or stuck. Carefully loosen and remove each bolt, keeping track of their locations for reinstallation. Once all the bolts are removed, gently lift out the old mount.

Step 7: Inspect the Old Mount

• Examine the old mount for signs of damage, such as cracks, tears, or excessive wear. Compare it to the new mount to ensure they are the same size and design. This comparison can help you understand the extent of the wear and tear and confirm you have the correct replacement part.

Step 8: Install the New Mount

• Position the new upper gearbox mount in place, aligning it with the bolt holes. Install the bolts by hand to avoid cross-threading. Once all the bolts are in place, tighten them using a torque wrench to the manufacturer's specified torque. This ensures the mount is securely fastened without being over-tightened, which could damage the mount or the surrounding components.

Step 9: Reinstall the Airbox (If Removed)

• If you removed the airbox, reinstall it by reversing the removal process. Make sure all hoses and electrical connectors are securely reattached. This step is crucial for ensuring the engine runs properly and efficiently.

Step 10: Lower the Vehicle

• Carefully lower the vehicle back to the ground by slowly lowering the jack. Remove the jack stands and wheel chocks.

Step 11: Test Drive

• Take your Peugeot 208 for a test drive. Pay attention to any vibrations, noises, or shifting issues. The new upper gearbox mount should provide a smoother and quieter ride. If you notice any persistent problems, double-check your work or consult a professional mechanic.

Maintenance Tips for Your New Mount

To prolong the life of your new upper gearbox mount and keep your Peugeot 208 running smoothly, consider these maintenance tips:

• Regular Inspections: Periodically inspect the mount for signs of wear or damage. Catching problems early can prevent more significant issues down the road.
• Avoid Harsh Driving: Aggressive driving habits, such as rapid acceleration and hard braking, can put extra stress on the mount. Drive smoothly to minimize wear.
• Check Other Mounts: Inspect the other engine and transmission mounts as well. If one mount is worn, the others might be too. Replacing all worn mounts at the same time can improve overall performance and reduce vibrations.
• Use Quality Parts: Always use high-quality replacement parts from reputable brands. Cheaper parts might not last as long or perform as well.

Conclusion

Replacing the upper gearbox mount (coxim superior cambio) on your Peugeot 208 might seem daunting, but with the right tools and guidance, it’s a manageable task. By following this detailed guide, you can restore your car's smooth and quiet ride, protect your drivetrain, and save money on costly repairs. Remember to prioritize safety and take your time. Happy wrenching, and keep your Peugeot 208 in top shape!