I recently started an OM617 that sat nearly ten years after it was overheated and scored one piston and cylinder then started tapping heavily.

Got a new battery, fired right up with some maintenance to the fuel system.

Within 100 miles ,I opened up the engine to rebuild it. Everything, other than that one cylinder, was in fantastic condition.

All 4 sets of rings were free to move about. the engine had no history of alt fuels and sat in a covered space in a very wet region

__________________