The M122 blower from Eaton has been used in two mainstream formats. One used by Cadillac on their STS & XLR, using the base M122 with a top mount cooler setup, the other by Roush in their Shelby 500 variant (M122H).
Both units produce good power but as with most parts developed for peak performance maintenance is key. If you hear anything getting noisier, get it checked out, continued noise maybe signs that a bearing is starting to wear. The important thing is to have them repaired when you hear early signs of something being wrong – if they are left rattling too long damage can spread from bearing wear, which is curable, to wear of the rotors and/or main casing, which can become bad enough to scrap the supercharger.
Replacing the bearings and oil seals in your supercharger will give it a new lease of life and peace of mind. If issues are not ignored, and repaired early, your supercharger should be recoverable using one of our services below.
Please note all quoted prices unless otherwise stated include UK vat at 20%.
EATON M122 & M122H SNOUT REBUILD SERVICE
If you are getting a rumbling or scoring sound from the front of your supercharger or suspect wear for any other reason this can be easily remedied with a service. Our Eaton M122 snout rebuild service is a cost-effective way to have your car back to good health. Our M122 snout rebuild service for £125 (to a loose snout) includes both inner and outer bearings, high-spec Viton nose seal, full clean and prep ready for immediate install and supplied with a bottle of replacement supercharger oil.
BUT – if you have any doubt over the condition of the case bearings, it would be advisable to change them as well. The case bearings are prone to premature wear, and you may wish to avoid having to remove and refit the supercharger again in the near future. If in doubt, and the problem may be with the main bearings rather than the snout, and you may wish to consider our M122 supercharger rebuild service.
EATON M122 & M122H SUPERCHARGER REBUILD SERVICE
Our M122H & M122 supercharger base rebuild service for £465 comprises of a full inspection, rebuild of the snout, case bearings and a deep clean with a fresh fill of the latest spec supercharger oil. We only use OE or equivalent spec components for peace of mind and life of your supercharger.
Our rebuild service does not include the supercharger coupler, these are pretty resilient however in some cases they do need replacing. If during inspection we find it broken, hairline cracks or slack in the drive holes we can provide a replacement OE coupler or uprated nylon solid coupler from just £38.
ROTOR PACK BEARINGS & SEALS
Our Eaton supercharger rebuild kits do not include the pair of bearings and seals situated between the rotors and timing gears of the rotor pack. This is because Eaton rolls the casting onto the bearing outer race, permanently sealing them in, meaning the casing must be fractured to remove those bearings. That said, these are in an oil bath and rarely fail – when rebuilding superchargers, we do not change the rotor pack bearings. If they do fail, some service providers in the US do offer rebuild of the rotor pack, but the Eaton Corporation themselves consider this to be an unreliable and often unsuccessful route to repair – when the rotor pack is worn out or damaged the only dependable solution is a new rotor pack.
If you want to attempt to rebuild your Eaton M122H or M122 rotor pack we can supply you the parts, but caution that it is not always successful.