How to rebuild a Sprintex Supercharger for the Mini R52 R53

Introduction

This tutorial provides a step-by-step guide on how to rebuild the S5-210 Sprintex Supercharger for the Mini R52 R53 (2002-2008). Rebuilding your supercharger can enhance performance and extend its lifespan. This guide will cover the necessary materials, disassembly, and reassembly of the supercharger.

Step 1: Gather Required Materials

Before starting the rebuild, ensure you have all necessary parts and tools. Here’s a list of what you’ll need:

Bearings

• SKF 6006 C3 (Snout Bearing) - Quantity 1 (30x55x13)
• SKF 6001-2RS C3 (Back of Rotors) - Quantity 2 (12x28x8)
• KYK 5205 C3 (Front of Rotors) - Quantity 2 (25x52x20.6)

Seals

• EAI Viton Snout - Quantity 1 (30x47x7)
• EAI Viton Rear of Rotors - Quantity 2 (18x30x7)
• EAI Viton Front of Rotors - Quantity 2 (35x45x8)

Additional Items

• Supercharger Belt Tensioner
• Supercharger Belt (Gates 6pk1425)
• Redline 75w90ns (1 bottle, use 3.77oz)

Tools

• Allen wrenches for cog gears
• Counterhold tool (an Audi/VW timing gear counterhold tool may be used)

Step 2: Disassemble the Supercharger

Follow these steps to carefully disassemble the supercharger:

1. Remove the Supercharger from the Vehicle: Disconnect it from any attached components.
2. Take Off Cogs: The cogs in the neck are fastened with allen bolts.
   • Note that the "master" driven cog has a right-hand thread, while the "slave" cog has a left-hand thread.
3. Use Counterhold Tool: If you encounter difficulty breaking the rotor bolts loose, utilize the counterhold tool.
4. Document the Process: As you disassemble, take notes or pictures to assist with reassembly.

Step 3: Replace Bearings and Seals

Once disassembled, proceed with replacing the bearings and seals:

1. Remove Old Bearings and Seals: Carefully extract the old components from their respective positions.
2. Install New Bearings:
   • Insert SKF 6006 C3 in the snout.
   • Place SKF 6001-2RS C3 in the back of the rotors.
   • Position KYK 5205 C3 at the front of the rotors.
3. Install New Seals:
   • Install EAI Viton seals in their respective positions (snout, rear, and front of rotors).

Step 4: Reassemble the Supercharger

Once all components are replaced, it’s time to reassemble:

1. Reattach Cogs: Use the appropriate threads for each cog.
2. Torque Bolts: There are no published torque specs, so use critical thinking and discretion.
3. Ensure Proper Alignment: Check that all components are correctly aligned and seated.

Step 5: Final Inspection and Installation

After reassembly, perform a final inspection:

1. Check for Loose Parts: Ensure everything is tight and secure.
2. Inspect Seals for Proper Seating: Make sure the new seals are properly seated to avoid leaks.
3. Reinstall the Supercharger: Follow the reverse order of disassembly to reinstall the supercharger in your Mini.

Conclusion

Rebuilding your Sprintex Supercharger can be a rewarding DIY project that enhances your Mini Cooper's performance. Remember to work carefully, take your time, and consult with professionals if needed. After completing the rebuild, consider performing a test drive to ensure everything is functioning correctly. Happy rebuilding!