Eaton M112 Supercharger Rebuild Service

The Eaton M112 supercharger is a great unit which is fitted to all of the 4.0 and 4.2 litre V8 models of Jaguar and Range Rover engine. Initially released in the 4.0 XKR and XJR, the supercharger evolved for the 4.2 litre applications with bigger rear bearings and a different rotor coating, and this version was fitted to all 4.2 litre supercharged Jaguars and Range Rovers.

Premature Seal or Bearing Wear

Good though they are, these superchargers can be subject to premature seal or bearing wear, or failure of the drive coupler. Rattling at idle is the indication that something is going wrong, usually that a bearing is starting to wear, or that a drive coupler is fractured and failing. The important thing is to have them repaired when you hear early signs of something being wrong – leave it too long and the damage will spread from bearing wear to wear of the rotors and/or main casing.

Eaton M112 Supercharger Rebuild Service 2

Bearings & Oil Seals

Replacing the bearings and oil seals in your supercharger will give it a new lease of life, and your own peace of mind. As long as issues are identified and repaired early, our Eaton M112 supercharger base rebuild costs from as little as £305 for the 4.0 Jaguar models and from £345 for the Jaguar and Range Rover 4.2 cars (which require more expensive rear bearings). You can either have your supercharger removed locally and sent to us by your preferred courier, or ask us about our collect and return insured courier service.

Drive In Service

Alternatively, bring the car to us for drive-in / drive-out Eaton M112 supercharger rebuild service including removal from and refit back to your Jaguar or Range Rover. Call us to discuss pricing and options for this service.

Eaton M112 Supercharger Rebuild Service 3

Rotor Pack Bearings

Our M112 supercharger rebuild service does not include recoating the rotors or changing the pair of bearings and seals which live between the rotors and timing gears in the middle of the rotor pack. This is because at manufacture Eaton rolls the casting onto the bearing outer race, permanently sealing them in and meaning the casing has to be fractured to remove those bearings.

That said, these are in an oil bath and rarely fail – if on inspection we discover they have failed, we do not charge for the strip and would inform you we cannot recover the supercharger. On this supercharger type that is about a 5-10% risk. Although some service providers in the US do offer rebuild the rotor pack, 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 your supercharger is too far gone to be recovered, we have stock of fully rebuilt M112 superchargers with brand new Eaton-supplied rotor packs, but this is a last resort!

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 – especially in the Jaguar and Range Rover applications which are quite hot under the bonnet.

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 M112 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.