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
- Full rebuild
- Clutch bearing
(Basic DIY rebuild kit)
- Billet compressor wheel
- 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.
3. Full rebuild:
Clutch service not included.
Standard OEM compressor wheel used.
- Complete seal system change
- High-speed bearings changed
- 1 input shaft bearing (OEM)
- 2 transfer gear bearing (OEM)
- 1 oil lip 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.
- VAT included (27%)
- 50% off if bought along a full rebuild
6. Billet compressor wheel:
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.