RE: Fogging a diesel engine.
Eric--- I've never heard of this practice being used on a diesel engine but that doesnt' mean it isn't. But given the potential for damage I would be inclined to contact an experienced and reputable diesel shop (or manufacturer) and find out what they do or recommend. I would think that the pickling process for a diesel is not unlike what I've seen done to airplane engines like the R-985s on Beavers. Plugs are pulled, the cylinders are filled with some sort of pickling oil, openings to the atmosphere are plugged as FF mentions, and so forth.