Supercharger Knocks

**gloryabides** · 01-07-2013

I am working on a 1997 Pontiac Grand Prix GTP 3800 supercharged.
The intake started leaking water and I had to replace it. Before I started working on the car, I noticed a knock coming from the top side.
When I took the supercharger off, and partially cleaned it, I noticed when I spun the shaft, the impellers were knocking together.
After I reinstalled it and got the car running again, the knock is still there. Now that I know what the knock is, is there a overhaul kit made to overhaul the supercharger?
Or is there something else I Can Do?
Any help in this matter would be appreciated

**rynoman03** · 01-07-2013

Factory Eaton replacement parts here ---> Eaton m90 | Supercharger m90 | m90 Eaton | Eaton m90 Supercharger

**blueguy** · 01-07-2013

Replace coupler, re-seal, new fluids dumped in, enjoy...99.9% of the time the "knocking" you hear sounds like tumbling rocks at idle and goes away whenever you gave it throttle...it's the coupler...which connects the pulley/snout shaft to the pair of rotors. You can also try re-packing the needle bearings in the back of the case when you slide the rotors out.

**Iceman6669** · 01-07-2013

Originally Posted by blueguy91

Replace coupler, re-seal, new fluids dumped in, enjoy...99.9% of the time the "knocking" you hear sounds like tumbling rocks at idle and goes away whenever you gave it throttle...it's the coupler...which connects the pulley/snout shaft to the pair of rotors. You can also try re-packing the needle bearings in the back of the case when you slide the rotors out.

Like you know anything about blowers...