The Opal Air [paid link] rear shock by DVO is a high-performance component designed for serious mountain bikers who demand precision, durability, and comfort. Regular maintenance, including oil changes, is crucial for ensuring the shock performs at its best. This guide provides a detailed, step-by-step process for changing the oil in the Opal Air [paid link] rear shock.

Tools Required

• 10mm socket wrench
• Torque wrench [paid link]
• 3mm and 5mm Allen wrenches [paid link]
• Shock pump
• Oil catch basin
• Clean rags
• DVO recommended suspension oil
• DVO oil seals
• O-ring removal tool
• 10mm spanner
• Latex gloves (optional but recommended)
• Small container for oil storage

Disassembly and Preparation

Before starting the oil change process, ensure that the bike is in a safe, stable position, such as in a bike stand [paid link]. It’s also important to wear gloves to keep your hands clean from oils and debris.

1. Remove the Rear Shock
   Start by detaching the rear shock from the bike frame. Use a 5mm Allen wrench [paid link] to remove the mounting bolts on both ends of the shock. Keep these bolts safe, as they will be reused.
2. Clean the Shock
   Use a clean rag to wipe off any dirt or debris from the shock. This is important to prevent contamination when you remove seals or internal components. Be thorough but gentle to avoid damaging sensitive parts.
3. Set Up the Work Area
   Lay down a clean surface or towel to protect the shock from scratches. Make sure you have easy access to all tools and the new oil to facilitate a smooth oil change process.

Oil Drainage

The next step is to drain the old oil from the shock. This step ensures that all the used oil is completely removed to maintain optimal performance.

1. Remove the Air Can
   Using a 3mm Allen wrench [paid link], remove the bolts holding the air can in place. Carefully separate the air can from the shock body. Make sure not to damage the air can during this process.
2. Drain the Oil
   Position the shock above the oil catch basin. Slowly compress the shock to force the remaining oil out. This can take a few minutes, so be patient and allow the oil to drain completely. Once the oil has drained, inspect the oil for any unusual particles or debris, which may indicate internal damage or wear.

Cleaning and Inspection

After draining the old oil, it’s crucial to clean and inspect the shock before reassembly.

1. Clean the Shock Internals
   Carefully use a clean rag to wipe the internal parts of the shock body. Pay close attention to the damper shaft and the rebound adjuster. Be sure to remove any dirt or grime that may have built up during use.
2. Inspect the Oil Seals
   Inspect the oil seals and O-rings for any signs of wear or damage. If you notice any tears, cracks, or compression, replace them with new seals. Worn seals can lead to oil leaks and decreased shock performance.
3. Check the Shock Shaft
   The shock shaft should be smooth and free from any grooves or scratches. Lightly grease the shock shaft with suspension grease to help ensure smooth operation during reassembly.

Reassembly and Refilling with New Oil

Now that the shock has been cleaned and inspected, it’s time to reassemble and refill the shock with fresh oil.

1. Install New Oil Seals
   Install the new oil seals into the air can. Ensure that they are properly seated to prevent leaks. Use your fingers to gently press the seals into place, ensuring they are flush with the air can’s edges.
2. Reassemble the Shock
   Slide the air can back onto the shock body and tighten the mounting bolts. Use a 5mm Allen wrench to ensure the bolts are tightened to the manufacturer’s torque specifications. The shock should be snug but not over-tightened.
3. Add New Oil
   For the Opal Air shock, DVO recommends using their specific suspension oil. Fill the shock body with the required amount of oil, usually indicated in the owner’s manual. The oil should be added slowly, ensuring no air bubbles are trapped inside. You may need to use a small funnel or syringe to control the flow.
4. Reassemble the Shock Components
   Once the shock is refilled with oil, install the air piston and reassemble the shock’s internal components. This step requires careful alignment to avoid damaging any internal parts. Make sure the components are seated correctly before moving forward.

Recharging the Shock with Air

Once the shock has been fully reassembled, you need to recharge the shock with air to the proper pressure.

1. Install the Shock Pump
   Attach the shock pump to the air valve on the shock. Ensure that the pump is securely attached to avoid air loss.
2. Set the Proper Pressure
   Use the shock pump to set the appropriate air pressure for your rider weight and riding style. Refer to the DVO Opal Air manual for the recommended pressures. Typically, these are based on your weight and the desired ride feel, but it’s always a good idea to start with the recommended values and adjust as necessary.
3. Check for Leaks
   Once the desired air pressure is set, remove the shock pump and inspect the shock’s air valve for any air leakage. If there is any noticeable hissing or air loss, check the valve core for tightness and re-tighten if needed.

Final Checks and Installation

Before reinstalling the shock onto the bike, ensure that everything is functioning properly.

1. Test the Shock’s Rebound and Compression
   Adjust the rebound and compression settings on the shock to their default positions. Cycle the shock through its range of motion by hand to feel for any unusual resistance or stiffness. The shock should move smoothly without any binding.
2. Reinstall the Shock on the Bike
   Once the shock is properly tuned and set up, reinstall it on the bike frame. Tighten the mounting bolts with a 5mm Allen wrench, being careful not to over-tighten them. Check the torque settings to ensure the shock is mounted securely.

Troubleshooting Common Issues

During or after the oil change process, you may encounter some issues. Here are a few common problems and solutions:

• Air Leaks: If the shock is losing air after an oil change, check the air valve core and seal. If either is damaged, replace them immediately.
• Sticking Rebound: If the rebound adjuster feels sticky, it may not be properly lubricated. Apply a small amount of suspension grease to the internal components and check the adjustment again.
• Unusual Noises: If you hear popping or grinding noises after the oil change, the shock might have trapped air. Compress the shock a few times to help release any air pockets.

Conclusion

Performing an oil change on your DVO Opal Air rear shock is an essential maintenance task that can significantly extend the lifespan and performance of the shock. By following this step-by-step guide, you’ll ensure that your rear shock operates smoothly and efficiently, providing the optimal ride experience for your bike. Regular maintenance, including oil changes, will help you avoid costly repairs and ensure your bike is always ready for the trail.