Maintaining the Marzocchi Bomber Air [paid link] rear shock is essential for ensuring optimal performance, comfort, and durability during your rides. One of the most crucial maintenance tasks is performing a rear shock oil change. Regular oil changes help maintain the damping performance of the shock, reduce friction, and prevent wear on internal components. In this step-by-step guide, we’ll walk you through the process of changing the oil in the Bomber Air [paid link] rear shock, along with tips for troubleshooting common issues, optimizing performance, and ensuring compatibility with your bike’s drivetrain.

Tools Required

• Marzocchi Bomber Air Rear Shock (model-specific)
• 8mm Allen wrench [paid link]
• 2.5mm Allen wrench [paid link]
• Shock pump
• Clean, lint-free rags
• Marzocchi-specific suspension fluid (or recommended equivalent)
• 10mm socket wrench (for some models)
• Torque wrench [paid link]
• A small container or drain pan for old oil
• Pliers
• Replacement seals (if needed)
• Zip tie or similar for holding the shock in place
• Gloves to maintain a clean working environment

Preparing the Shock for Oil Change

Before starting the oil change, it is important to prepare the shock and bike for maintenance. Ensure that the bike is stable and properly secured on a work stand. This will allow you to handle the shock with ease.

1. Remove the Rear Shock from the Frame

To begin, carefully remove the Bomber Air shock from the bike frame by loosening the bolts with your 8mm Allen wrench. Depending on the bike, you may also need to remove the rear wheel or take off any other components obstructing access to the shock. Ensure the shock is free of debris before handling it further.

2. Clean the Shock Exterior

Before beginning the oil change process, clean the exterior of the rear shock thoroughly with a lint-free rag. This ensures no dirt or grime enters the shock during the oil change process. A clean shock will help avoid contamination inside the shock body, which can lead to poor performance.

Disassembling the Bomber Air Shock

Now that your shock is clean and removed from the frame, it’s time to begin disassembling it.

3. Remove the Air Canister

The first step in disassembling the Bomber Air shock is to remove the air canister. Use the 2.5mm Allen wrench to unscrew the bolts holding the air canister in place. Slowly release the air pressure from the shock using a shock pump. Be cautious during this step, as releasing air can cause the parts to pop out under pressure.

Once the air pressure is fully released, carefully remove the air canister from the shock body. Take care to keep the canister upright to avoid spilling any remaining fluid inside.

4. Drain the Old Oil

With the air canister removed, it’s time to drain the old oil. Position the shock over your drain pan and remove any oil from the shock’s damping system. Using a 10mm socket wrench, unscrew the shock’s rebound adjuster to allow any remaining oil to flow out of the shock body.

Give it some time to ensure all old oil is drained. Once completed, wipe off any excess oil that may have spilled during the draining process.

Cleaning the Internal Components

With the shock disassembled, now is the time to clean the internal components and inspect them for any wear.

5. Inspect Internal Components for Damage

Check all internal seals, bushings, and o-rings for wear or damage. If you find any damaged seals or parts, it is recommended to replace them before continuing. Damaged seals can cause air or oil leaks, which will affect the performance of the shock.

6. Clean Internal Parts

Using a clean rag or cloth, wipe down the internal parts of the shock, such as the shaft and piston. Ensure that no dirt or debris is left behind. Avoid using solvents or abrasive materials that can damage the parts. Only use the recommended suspension fluid for cleaning or lubrication.

Reassembling the Bomber Air Shock

After cleaning, it’s time to reassemble the shock and fill it with fresh oil.

7. Refill with New Oil

Refill the shock with the correct type and amount of oil recommended by Marzocchi for the Bomber Air model. Use the specified suspension fluid for optimal performance. The recommended fluid will depend on your riding style and shock model, so refer to your manual for exact specifications. Fill the shock body with fluid, making sure it is the right level as indicated by Marzocchi’s instructions.

8. Reassemble the Shock

Once the oil is filled, carefully reassemble the shock by reversing the disassembly steps. First, reinstall the rebound adjuster and secure it with your 10mm socket wrench. Next, reinstall the air canister and ensure that all bolts are tightened to the specified torque settings.

Testing and Adjusting the Shock

With the oil change and reassembly complete, it is important to test the shock to ensure it is working correctly.

9. Set the Correct Air Pressure

Before reinstalling the shock on the bike, use a shock pump to set the correct air pressure based on your rider weight and preferred suspension settings. Marzocchi typically recommends a range of pressure settings, but it may vary depending on your preferences and riding conditions. Ensure the shock is properly inflated before moving forward.

10. Reinstall the Shock

Reinstall the Bomber Air shock back onto your bike frame. Use your 8mm Allen wrench to secure it in place. Check that all bolts are tightened correctly to the manufacturer’s specifications. A torque wrench [paid link] will help ensure the correct tightness.

Troubleshooting Common Issues

While performing the oil change, you may encounter a few common issues. Here are solutions to some common problems:

• Air Leakage: If air is leaking after reassembly, check the seals around the air canister. Damaged seals can allow air to escape [paid link], leading to performance issues. Replace any damaged seals immediately.
• Poor Damping Performance: If you notice poor damping performance after the oil change, it could be due to insufficient oil levels or improper oil type. Double-check the oil type and level to ensure it’s up to spec.
• Suspension Feel Too Stiff or Too Soft: If the shock feels either too stiff or too soft, check the air pressure and adjust it based on your preferred setup. You may also need to adjust the rebound and compression settings for your riding style.

Final Thoughts

Changing the oil in your Marzocchi Bomber Air rear shock is a key maintenance task that ensures your shock performs optimally. By following these steps carefully, you can maintain the shock’s performance and extend its lifespan. Regular maintenance, such as oil changes, will keep your rear shock working smoothly, giving you a better, more controlled ride.