How to Rebuild Your Bomber Air Rear Shock at Home

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The Bomber Air [paid link] rear shock from Marzocchi is renowned for its durability, high performance, and versatility, making it a popular choice for riders who demand both comfort and control. Over time, however, like any suspension component, it may require maintenance to keep performing at its best. Rebuilding the Bomber Air [paid link] rear shock at home can save you time and money, while also ensuring that your bike is tuned to perfection. This guide will take you through the steps to rebuild your Bomber Air rear shock, from disassembly to reassembly, along with troubleshooting common issues and tips for optimizing performance.

Tools Required

  • 5mm Allen wrench [paid link]
  • 6mm Allen wrench [paid link]
  • Torque wrench [paid link]
  • Shock pump
  • 3mm and 4mm Allen wrenches [paid link]
  • Clean rags
  • Isopropyl alcohol or degreaser
  • Suspension fluid (recommended by Marzocchi)
  • Soft mallet
  • Small brush for cleaning
  • Replacement seals and o-rings (specific to Bomber Air)
  • Snap ring pliers

Step-by-Step Guide to Rebuilding Your Bomber Air Rear Shock

1. Prepare for the Rebuild

Before you begin the rebuild process, it is essential to prepare both yourself and your work area.

  • Choose a Clean Workspace: Ensure your workspace is clean, organized, and well-lit to avoid contaminating the shock or losing small parts.
  • Gather the Necessary Tools: Ensure you have all the necessary tools for the rebuild. Having everything ready will prevent interruptions during the process.
  • Wear Gloves: To avoid grease and oils from your hands contaminating the shock components, it’s advisable to wear gloves while working.

2. Remove the Shock from the Bike

Start by safely removing the rear shock from your bike. This will allow you to work on it comfortably and avoid damaging other components.

  • Release the Shock Mounting Bolts: Use a 5mm Allen wrench to remove the bolts securing the shock to the frame and the linkage.
  • Inspect for Damage: Before completely removing the shock, inspect the mounting hardware for any signs of wear or damage. If you notice any issues, replace the hardware as needed.

3. Disassemble the Bomber Air Rear Shock

Disassembling the shock is a delicate process that requires attention to detail. Take your time to avoid damaging any components.

  • Remove the Air Sleeve: Using a 6mm Allen wrench, remove the screws holding the air sleeve in place. Once the screws are out, gently slide the air sleeve off. Be cautious not to damage the o-rings as you remove the air sleeve.
  • Take Out the Damper Cartridge: With a soft mallet, tap the damper body gently to release it from the air chamber. Once it is loose, pull it out completely.
  • Disassemble the Damper Cartridge: Use the appropriate tools to remove the damper cartridge from the shock body. This may require using snap ring pliers to remove the snap rings. Make sure to keep track of all the parts as you remove them.

4. Clean the Components

Cleaning each component thoroughly before reassembly is crucial to ensure that no dirt or debris contaminates the shock system.

  • Clean the Shock Body: Use a clean rag and isopropyl alcohol or degreaser to wipe down the shock body and other metal parts. Be sure to remove any dirt, oil, or old suspension fluid.
  • Inspect for Wear: Carefully inspect all parts, especially the damper, air chamber, and seals, for any signs of wear or damage. If you find any damaged components, replace them with new ones from Marzocchi.
  • Clean the Air Sleeve: Pay special attention to cleaning the air sleeve and any internal parts that come into contact with the shock oil. Use a soft brush to clean any debris from hard-to-reach areas.

5. Replace the Seals and O-Rings

The seals and o-rings play a critical role in preventing leaks and ensuring the smooth operation of the shock. Replacing them during a rebuild will extend the life of your shock and improve its performance.

  • Install New Seals and O-Rings: Replace the old seals and o-rings with new ones that are compatible with the Bomber Air shock. Use a small amount of suspension fluid to lubricate the new seals before installing them.
  • Check for Proper Fit: Ensure that all seals and o-rings fit snugly and are seated properly. This will prevent air or oil leaks when the shock is reassembled.

6. Reassemble the Bomber Air Rear Shock

Once all components are cleaned and the seals have been replaced, it’s time to reassemble the shock.

  • Insert the Damper Cartridge: Carefully insert the damper cartridge back into the shock body, ensuring it aligns correctly with the internal parts. Secure it in place with the appropriate fasteners.
  • Install the Air Sleeve: Slide the air sleeve back onto the shock body and tighten the screws with a 6mm Allen wrench. Be sure not to overtighten, as this could damage the threads or seals.
  • Reinstall the Mounting Hardware: Reattach any mounting bolts that secure the shock to the frame. Tighten them to the recommended torque specification to prevent any movement during rides.

7. Refill with Suspension Fluid

After reassembling the shock, refill it with fresh suspension fluid. This will ensure the shock operates at optimal performance.

  • Use the Recommended Fluid: Marzocchi recommends using a specific suspension fluid for the Bomber Air shock. Follow the guidelines for the exact fluid type and quantity.
  • Check for Leaks: Before reinstalling the shock, check the shock body for any signs of leaks. If any leaks are detected, disassemble and troubleshoot the issue by checking seals and tightening fasteners.

8. Reinstall the Shock on the Bike

Now that your Bomber Air rear shock is reassembled, it’s time to reinstall it on your bike.

  • Mount the Shock: Align the shock with the frame and linkage, then insert the mounting bolts. Use a torque wrench [paid link] to tighten the bolts to the manufacturer’s recommended torque specification.
  • Check for Proper Function: Before heading out on a ride, check the shock’s performance by pressing down on the rear end of the bike. Ensure that the suspension is functioning smoothly and without any unusual resistance.

Troubleshooting Common Set-Up Issues

1. Air Leaks

If you notice a loss of air pressure in your shock, it could be due to a damaged o-ring or seal. Check for any visible damage or wear and replace the seals as necessary.

2. Lack of Rebound Control

If the rebound damping feels too fast or too slow, the damper cartridge may need to be inspected for air bubbles or contamination. Consider performing a thorough bleed of the damper to resolve this issue.

3. Excessive Stiffness or Sag

Excessive stiffness or sag could indicate improper air pressure settings or a problem with the air spring. Check the air pressure and adjust it according to your weight and riding style.

Customization and Optimization for Better Performance

To optimize the Bomber Air rear shock’s performance, consider adjusting the air pressure and rebound settings based on your riding style and the terrain you’ll be tackling. For aggressive downhill riders, increasing the air pressure and adjusting the rebound damping to a slower setting may improve control and reduce bottoming out. For cross-country riders, a lighter air pressure and faster rebound damping may provide a more responsive feel.

Compatibility with Other Drivetrain Components

The Bomber Air rear shock is designed to work seamlessly with a variety of suspension and drivetrain systems. However, it is always important to check compatibility with your bike’s frame, particularly the shock mount hardware and the linkage system. Ensure the shock is properly tuned for your specific riding needs, as performance can vary based on the frame geometry and suspension design.