Alpina B5 B7 supercharger maintenance, rebuild, prices

With these Alpina superchargers are most important to keep the oil change periods, and use the oil and oil filter provided by Alpina/BMW.

Oil change periods should be 10-15k kms, and during the oil change don’t forget to drain the oil from the bottom of the intercooler and collect it to a cup. These superchargers leaking oil naturally.

The acceptable leak amount should be a “shot glass” amount. So some cl, or approximately half of the WD40 cup as demonstrated here.

If you have problems with the supercharger I can offer you several rebuild schemes:

  1. Basic o-ring set
  2. Basic rebuild
  3. Full rebuild (without clutch) –> Most advised
  4. Clutch bearing
  5. (Basic DIY rebuild kit)
  6. Supercharger upgrade/tuning
  7. Oversized pulley for higher boost
  8. Clutch center nut
  9. Clutch elimination adapter
  10. Clutch removal/installation tool

Be aware, prices are just for information! Final prices will be provided after disassembly and inspection!


1. Basic o-ring set: 120 €

If your supercharger ran less than 100k km, you have no pulley wobble and your only problem is small oil leak you can try changing the o-rings. Personally I’m not making this basic repair but I can supply you a set of o-rings and you can Do It Yourself. These are made of Viton which is heat resistant up to 200 C.

  • A set of o-rings:
    • 1 supercharger housing o-ring
    • 2 supercharger core o-ring
    • 1 main bearing housing o-ring
    • 1 back plate o-ring
    • 1 suction side restrictor o-ring
    • 1 pressure tube o-ring
    • 2 orings for oil joints
  • A set of new screws (6 + 2 pcs)
  • Fixing glue for the screws

When you’re doing the o-ring service, be aware for some handling. Most important: NEVER PUSH OR HIT THE SHAFT! If you hit the shaft, the main bearings will damage and the supercharger will be dead in a very short time. Use engine oil when assembling the o-rings.


2. Basic rebuild: 980 €

If your supercharger ran more than 100k km, or the o-ring changing not solves the oil leak problem or you have a pulley wobble I can offer you this basic rebuild.

With my service not only the leakage will be stopped by changing all seals to new ones, but the main ultraprecision bearings are also changed for new OEM ones.

  1. Test and inspect faulty supercharger.
  2. Disassemble and inspect the inner parts.
  3. Professionally clean all inner parts with ultrasonic cleaner with use of a special cleaning liquid.
  4. Produce new parts acc. to my blueprints
  5. Let the compressor wheel dynamic balanced by a professional subcontractor.
  6. Assemble with the new parts, new bolts glued in
  7. Test run

Price contains the mentioned 7 steps but not contains clutch maintainance, or any other additional services like changing of a damaged compressor wheel, full rebuild, or supercharger upgrade. Shipping not included. If you need the upgraded parts please note it to me. Details and prices at the Alpina tuning section.


3. Full rebuild (without clutch): 1350 €

If your supercharger ran more than 200k km, or there is loud noise because of bearings I can offer you the full rebuild.

After the basic rebuild the rear side bearings will be changed also. Shipping not included. Clutch service not included.

  • 1 input shaft bearing (OEM)
  • 2 transfer gear bearing (OEM)
  • 1 oil seal (OEM, Viton)

4. Clutch bearings: 100 €

If your supercharger has a loud clutch bearing I can supply you a kit for Do It Yourself purposes.

The kit contains:

  • 2 bearings
  • 2 o-rings

If You need the o-rings for the suction tube and pressure tube let me know!

If you don’t have the clutch removal tool, it could also be ordered.

You can find the DIY writeup for the maintenance HERE.


5. Basic DIY rebuild kit

Later will be available a basic rebuild kit for those who have a supercharger where the basic or full rebuild has been previously done by me.

Price will be available later.

The kit contains:

  • o-ring set
  • screw set
  • fixing glue
  • carbon seal
  • main UP bearings

6. Supercharger upgrade/tuning: 370€

During this upgrade the original compressor wheel is changed to a optimized design billett compressor wheel and uprated Hybrid ceramic Ultraprecision bearings.

Besides all parts are original, no machining, no tune needed, bolt on.

The reason that the original UP bearings are rated up to 85.000 rpm but the SC has 100.000 rpm. Which means faster worn.


7. Oversized pulley for higher boost: 450€

The larger crankshaft pulley is 6% larger than stock so the supercharger rpm will be raised from the stock 103.000 rpm to 109.000 rpm which results higher HP. I’m highly advising to use this upgrade with the billet compressor wheel and hybrid ceramic bearings which can withstand this high rpm.

Plug and play however larger size needs longer belt which will be also included in the package.


8. Clutch center nut: 50€

If your center nut is damaged or you just need a new shiny one I can supply you. Package also includes the bolt.


9. Clutch elimination adapter: 120€

If you don’t want to mess any more with the clutch this elimination adapter is for you. It goes in place of the clutch housing and you have to simply bolt the pulley onto this.

Be aware, gear rattling will occure on idling. As idling is an instable condition there’s no load on the blades so gear rattling occurs. Which is annoying however totally normal.


10. Clutch removal/installation tool: 50€

With this tool you can install or remove the clutch from the supercharger. Made out of stainless steel, so it’ll not rust. 🙂

Alpina B5 B7 supercharger maintenance, rebuild, prices” bejegyzéshez 15 hozzászólás

  1. 5. Basic DIY rebuild kit
    Hallo I,m interesing What price with shipping to Poland ???

    1. Hi Adrian,
      Thank you for your interest. Option 5 is not yet available. And it’ll be only available for those who have already let their supercharger rebuilt by me previously, as it needs major change.

  2. Do you offer a compressor upgrade ?
    And can you fully rebuild my supercharger ?

    1. Yes, I offer a billett compressor upgrade. It is a billett milled material vs the cast oem. It is lighter and stronger, and it has extended blades and tips. It should bring about 1-2 psi more. I was also planning to make a larger impeller upgrade but I’m waiting for to receive at least 3-5 pre payment for it. It could bring the car up to 600 hp.
      Fully rebuilding the supercharger is also not a problem.

  3. How lon wil it take for you to repair the supercharger, return time?

  4. do you offer your service also with a new clutch,ours is faling apart and the compressorwheel has a smal dent

  5. Hi,

    My supercharger has failed. The impeller is damaged, I am interested in the upgraded impeller and the crank pulley. Please let me know what the process and cost is for the full rebuild with whatever upgrades are available and the prepayment for the pulley along with return shipping. Thank you! -Santiago

    1. Hello, I can do also the rebuild with upgraded impeller and also the larger crank pulley. Please contact me and we discuss about the further steps. Or you can order the repair ar the bottom of the page.

  6. How do I order #6 the upgrade? I can install the parts just need the bearings and upgraded compressor wheel. I see 360Euro, what is shipping to USA, Arizona?

  7. how much for full rebuild B6 supercharge including shipping to UAE ( Abu Dhabi )

    1. Standard rebuild prices are the same for B5, B6 and B7 what you can find under supercharger repair section of my web page. However a final quote could be provided only after the tear down analysis of the supercharger. Shipping prices usually vary on adress therefore it needs to individually quoted and provided to the client. For this reason please contact me on the contact form or via email.

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