Storing an engine

• Change oil and drive it once so it gets up to running temp

• Stop engine for the last time by cutting off fuel supply then let it starve

• Take out engine and put it in a place as dry as possible

• Be careful when you take it out that you don't spill coolant into any opening in the engine

• If it's stored in less than 55% humidity, there is no danger of rust, but the Mini engine is more forgiving to prolonged storage than others, and if you can't ensure dry air, at least avoid humidity.
   

In my (sore) experience, the camshaft is the one that goes after a long humid storage. Just the tiniest amount of rust here, and you'll
be left with just a shaft few miles after starting to use it again. Then you go no further.

To remove dirt from inside wheel arches use a high pressure steam washer. Let dry *thoroughly*, at least a couple of dry warm days. Then follow up with thin rust protecting oil. Then again with a moderate layer of underbody wax sprayed on.