Cadillac[COLOR=#000000] I have been flushing engines of all sorts for over 40 years with Diesel, never had a problem and recovered many that were considered write-offs needing a rebuild by others. Basically it cleans out a lot of gum and varnish on old engines, Diesel fuel is an oil,(why C.I. engines are known as oil engines),and a pretty good lubricant, it also removes water from the oil galleries of engines that have been under water or have had a leaking head gasket. I did about 60 vehicles in a week for a dealer that had been flooded in a small town, Groomers cleaned and detailed them all and they were steamcleaned, undersealed and waxed. Full disclosure to buyers and zero problems. Water in the intake on a hot engine is another trick to clean out the crud.[/COLOR] although I have seen mufflers choked with all the Carbon that is blown out.
Procedure is warm engine, drop oil. Replace drain plug, fill with Diesel to fill line, start and run for 5 -10 minutes with a few rev rises then stop, drain, replace oil filter, replace drain plug, fill with new oil and ready to go.
Water injection: Hot engine hold revs at 1000 plus for most small engines, squirt water into intake and blip throttle occasionally. Crap will fly out of the exhaust. Water injection is used on very heavily supercharged engines under load to smooth combustion and increase cylinder pressure while also stopping detonation. Ever notice how on a foggy morning your engine runs better down in a hollow? Nice cool wet air is why.
Big difference between fuel in oil,(leak), water in oil,(leak), and a situation that causes hydraulicing.
Are you saying squirting water in the intake cleans carbon deposits in engine??