Mini Cooper S R53 JCW – Servicing the Eaton M45 supercharger

When I bought the Mini, it had reached the 160.000km or 100.000 miles mark. This is a milestone in the Mini Cooper S service history, because it means that you need to service the Eaton M45 supercharger (new fresh supercharger oil etc etc).

I saw the episode from Wheeler Dealers and felt confident. It was a lot of work, but fortunately it wasn’t complex. As this isn’t my daily driver, I meant I could take the time.

Eaton M45 supercharger on the work bench

The new Compressor Bypass Valve (CBV) vs the old

Dirty throttle body!

Finally cracked the supercharger open to allow for visual inspection of the gears (they looked good!)

I also replaced the supercharger coupler with a new oil filled nylon coupler (in red).