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. If you want to know the tech basics you can read it HERE.
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:
- Basic o-ring set
- Basic rebuild
- Full rebuild (without clutch) –> Most advised
- Clutch bearing
- (Basic DIY rebuild kit)
- Supercharger upgrade/tuning
- Oversized pulley for higher boost
Be aware, prices are just for information! Final prices will be provided after disassembly and inspection!
1. Basic o-ring set:
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)
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:
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.
- Test and inspect faulty supercharger.
- Disassemble and inspect the inner parts.
- Professionally clean all inner parts with ultrasonic cleaner with use of a special cleaning liquid.
- Produce new parts acc. to my blueprints
- Let the compressor wheel dynamic balanced by a professional subcontractor.
- Assemble with the new parts, new bolts glued in
- Test run in vehicle for about 100 km.
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):
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:
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:
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
Under design and test phase.
The crankshaft pulley will be changed to this larger side so the supercharger rpm will be raised to 107.000-110.000 rpm which results higher HP. The uprated hybrid ceramic ball bearing can withstand this high rpm.