Eaton M122 & M122H Supercharger Rebuild Kits

There have been two mainstream applications of the M122 blower from Eaton. 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.

Eaton M122 & M122H Supercharger Rebuild Kits 1

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 serviceable, our Eaton M122 supercharger rebuild kit starts at just £46 (Snout).

Please note all prices quoted unless otherwise stated include UK vat at 20%.

Eaton M122 & M122H Supercharger Rebuild Kits 2

EATON M122 & M122H SNOUT REBUILD KIT

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 our Eaton M122 snout rebuild kit. At only £46 it is a cost-effective way to have your car back to good health. Our snout rebuild kit includes both inner and outer bearings, high-spec Viton nose seal & 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. For the sake of two more bearings first time around consider opting for our M122 supercharger rebuild kit!

EATON M122 & M122H SUPERCHARGER REBUILD KIT

Our M122H & M122 supercharger rebuild kit comprises of Inner & Outer Snout bearings, high quality Viton snout Oil Seal, two needle case bearings & fresh current spec supercharger oil. We only use OE or equivalent spec components for peace of mind and life of your supercharger.

If you have had an isolator failure, found cracks or lost spring tension then a new coupler may be needed. We supply OE sprung couplers, priced at £95 these can be added to the M122 supercharger rebuild kit.

Eaton M122 & M122H Supercharger Rebuild Kits 3

Eaton M122 & M122H Supercharger Rebuild Kits 4

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 rebuild your Eaton M122H or M122 rotor pack we can supply you the parts, but caution that it is not a straightforward task.

Preventative oil changes are very important on Eaton superchargers, as the ‘sealed for life’ claim is at best an aspiration, and repairs can be expensive. Although Eaton uses a high quality synthetic aviation turbine oil in its supercharger range, the oil is not indestructible and does oxidize gradually over years of exposure to high working temperatures – it just lasts longer than a plain mineral oil would.

After only 50,000 miles, the original oil can have degraded from the nice clear sample on the left to burnt-smelling brown soup like the right hand sample – not good for protecting the bearings and seals in your Eaton M45 supercharger!

We have a range of oil refill kits which include the required quantity of oil for your Eaton supercharger, with a syringe and tube to aid removing the old oil and filling with the new.